Removal of Nickel from Wastewater Using Ultrafiltration Membranes
GABRIELA CIOBANU, “Gheorghe Asachi” Technical University of Iași,
Romania, “Cristofor Simionescu” Faculty of Chemical Engineering and
Environmental Protection,
gciobanu03@yahoo.co.uk MARIA HARJA, “Gheorghe Asachi” Technical
University of Iași, Romania, “Cristofor Simionescu” Faculty of Chemical
Engineering and Environmental Protection
Abstract In this study the asymmetric cellulose acetate membranes
prepared by the phase inversion method were used for removal Ni2+ ions from
wastewater. The membrane morphology was studied by Scanning Electron
Microscopy (SEM) and the pore diameters have been determined by Bubble-point
test (BPT). In the ultrafiltration experiments carried out in a flat-cell
unit, the synthetic wastewater of nickel (10 mg/L) was used. The obtained
results show that the flux and ion retention, increase with increasing
pressure. Keywords: membrane; cellulose acetate; ultrafiltration; nickel
ions.
Effect of Metal Synergy and Loading on Binary W-Mo/HZSM-5 Catalyst for
Non-Oxidative Conversion of Methane into Carbon and Petrochemicals
RONALD MUSAMALI, Durban University of Technology, Chemical Engineering
department, South Africa,
musamalironald@gmail.com YUSUF ISA, Durban University of Technology,
Chemical Engineering department, South Africa
Abstract Processing of energy from fossil fuels is associated with
emission of carbonaceous compounds. Therefore, non-oxidative conversion of
methane into carbon and petrochemicals remediates emission of these
greenhouse gases into the atmosphere. This present study demonstrates the
development of stable, durable, and tunable binary catalyst systems
comprising of W, &Mo supported on HZSM-5. The catalyst systems were
synthesized by incipient wetness impregnation, characterized, and tested for
non-oxidative methane conversion in a packed bed reactor. Reactor effluents
were analyzed using gas chromatography. Based on the results obtained,
competing reactions between different metal species, loading, and synergism
influenced product distribution. Carburized molybdenum (Mo2C) on HZSM-5
zeolite alone exhibited low catalytic activity but on promotion with W, its
activity increased tremendously. The reaction entailed dissociation of
methane molecules on carburized Mo to form C2-species as primary
intermediates which were further oligomerized into aromatics and higher
hydrocarbons in the channels of HZSM-5 zeolite. Keywords: Methane;
non-oxidative; petrochemical; W-Mo/HZSM-5 catalyst.
Chemical Recycling of Wastepaper to Valuable Products
ALEKSANDRA MIKHAILIDI, St. Petersburg State University of Industrial
Technologies and Design, St. Petersburg, Russia,
amikhailidi@yahoo.com NINA
KOTELNIKOVA, Institute of Macromolecular Compounds, Russian Academy of
Sciences, St. Petersburg, Russia
Abstract The aim of the present study was to develop a method for
preparing cellulose-based hydrogels (HGs) from waste paper (WP). Newsprint
paper and various types of cardboard were subjected to pretreatments and
then dissolved in DMAc/LiCl. Stable hydrogels were formed by spontaneous
gelation from the solutions of WP. The properties of the HGs were examined
both chemically and by FTIR, WAXS and SEM. FTIR confirmed the chemical
purity of HGs. The structure of initial samples, HGs and freeze-dried HGs
was characterised with WAXS. The cellulose I structure in the initial WP
samples was totally disordered in solutions and partly recrystallized to the
structure of cellulose II in freeze-dried HGs. According to SEM, the HGs
revealed a random network with evenly distributed through pores of different
sizes. Keywords: waste paper; dissolution; hydrogels; structure;
morphology.
Assessement of Crude Liquid Phase Resulted in Hydrothermal Carbonziation
of Spruce Bark Wastes
IULIANA BEJENARI, “Gheorghe Asachi” Technical University of Iași,
Romania, “Cristofor Simionescu” Faculty of Chemical Engineering and
Environmental Protection GABRIELA ANTOANETA APOSTOLESCU, “Gheorghe
Asachi” Technical University of Iași, Romania, “Cristofor Simionescu”
Faculty of Chemical Engineering and Environmental Protection IRINA VOLF,
“Gheorghe Asachi” Technical University of Iași, Romania, “Cristofor
Simionescu” Faculty of Chemical Engineering and Environmental Protection,
iwolf@tuiasi.ro
Abstract This work aims to investigate the influence of process
parameters on chemical composition of liquid phase resulted from
hydrothermal carbonization of spruce bark (Picea abies). The thermal
conversion of biomass was carried out at 200 and 240°C with a residence time
of 2.5 and 5 h and a solid to liquid ratio of 1:10. Chemical
characterization of liquid phase showed a presence of an important content
of polyphenols and carbohydrates. The process parameters had a significant
influence on chemical composition. Thus, an increase in temperature and
residence time leads to a decrease of total polyphenols content and
carbohydrates as well. Keywords: bio-crude liquid; hydrothermal
carbonization process; total polyphenols content; total reducing sugars
content; spruce bark biomass.
Thermochromic Materials: Oxides with Applications in Intelligent
Technologies
GABRIELA ANTOANETA APOSTOLESCU, “Gheorghe Asachi”
Technical University of Iași, Romania, “Cristofor Simionescu” Faculty of
Chemical Engineering and Environmental Protection MIHAELA
AURELIA VIZITIU, “Gheorghe Asachi” Technical University of Iași,
Romania, “Cristofor Simionescu” Faculty of Chemical Engineering and
Environmental Protection CORINA CERNĂTESCU, “Gheorghe
Asachi” Technical University of Iași, Romania, “Cristofor Simionescu”
Faculty of Chemical Engineering and Environmental Protection
CLAUDIA COBZARU, “Gheorghe Asachi” Technical University of Iași,
Romania, “Cristofor Simionescu” Faculty of Chemical Engineering and
Environmental Protection RAMONA ELENA TĂTARU-FĂRMUȘ,
“Gheorghe Asachi” Technical University of Iași, Romania, “Cristofor
Simionescu” Faculty of Chemical Engineering and Environmental Protection NICOLAE APOSTOLESCU, “Gheorghe Asachi” Technical University
of Iași, Romania, “Cristofor Simionescu” Faculty of Chemical Engineering and
Environmental Protection,
napostol@ch.tuiasi.ro
Abstract Many types of smart materials have been studied and
developed in the late years, due to their applications in industry
(military, aerospace, medical, construction). The possibilities to develop
environmentally friendly products (e.g. reducing the cost of building
maintenance by using construction materials / smart windows, pollution
reduction by using photo-catalytic active materials) are also studied. This
type of intelligent materials also includes thermo-chromatic materials, able
to change their color with temperature variation. This paper presents the
phenomenon of thermo-chromatism, the main classes of thermo-chromatic
materials, with emphasis on oxide materials, methods of obtaining, their
applications and the current state of research in the field of mechanisms of
producing thermo-chromatic phenomena. Keywords: thermochromic materials;
organic-inorganic hybrid systems; VO2.
Lycopene – Background, Perspectives and Challenges in Dermato-Cosmetic
Formulas
DELIA TURCOV, “Gheorghe Asachi” Technical University of Iași, “Cristofor
Simionescu” Faculty of Chemical Engineering and Environmental Protection,
Iași, Romania ANCA ZBRANCA, “Grigore T.Popa” University of Medicine and
Pharmacy, Faculty of Medical Bioengineering, Iași, Romania LĂCRĂMIOARA
RUSU, “Vasile Alecsandri” University of Bacău, Faculty of Engineering,
Bacău, Romania DANIELA ȘUTEU, “Gheorghe Asachi” Technical University of
Iași, “Cristofor Simionescu” Faculty of Chemical Engineering and
Environmental Protection, Iași, Romania,
danasuteu67@yahoo.com
Abstract In the dermato-cosmetic formulation, the antioxidants have
gained an almost permanent place based on strong scientific arguments. The
most of the antioxidant ingredients enriched formulas are intended for
antiaging skincare products, even though in a wide variety of presentation
forms, these have no special indications and are limited to daily skincare
routine for healthy skin. Nevertheless, there is an increasing interest for
antioxidant compounds also for dermatocosmetic products with medical
indications for acne, rosacea, and seborrheic dermatitis. Therefore, finding
new resources or fructification of any discovered source of antioxidant
compounds have led to increasing the researches related to performance,
stability, efficiency and quality of extraction methods. Special attention
to indigenous plant resources, economical and rich in antioxidant active
ingredients is as well inherent but also incipient, if we have to consider
the amount of well-known but still unexploited active ingredients.
Keywords: antioxidant effects; dermatocosmetic products; lycopene
characterization; lycopene extraction methods
Observations on the Spinning Disc Micromixing Characteristics
EUGENIA TEODORA IACOB TUDOSE, “Gheorghe Asachi” Technical University of
Iași, “Cristofor Simionescu” Faculty of Chemical Engineering and
Environmental Protection, Iași, Romania,
et_tudose@yahoo.com
Abstract The spinning disc technology is one of the most versatile
process intensification techniques used in different application fields. The
intense micromixing is one of the strong features the spinning disc is used
for. The current study includes experimental data related to the dispersion
number values, obtained at different working parameters, namely the feeding
liquid flow rate and the disc rotational speed. These were used to calculate
the characteristic SD micromixing times, found to decrease faster with the
disc rotational speed increase, especially at smaller flowrates. The shear
stress is increasing fast with the rotational speed and varies with the disc
radial position. Furthermore, the residence time has the smallest values at
the highest rotational speeds and liquid flowrates. Thus, despite the
increased micromixing obtained at large rotational speeds, the corresponding
shorter residence time can be a restricting factor, since the processed
liquid cannot take advantage of the enhanced turbulence. Keywords:
diffusion coefficient; indented surface; micromixing time; residence time;
shear stress
Researches Regarding the Monitoring of Underground Water Quality in
Vulnerable Communities to Nitrate Pollution from Agricultural Sources in
Botoșani County, Romania
ALINA AGAFIȚEI, “Gheorghe Asachi” Technical University of Iași, Faculty
of Hydrotechnics, Geodesy and Environmental Engineering, Iași, Romania,
alinaagafitei@yahoo.com VASILE LUCIAN PAVEL, “Gheorghe Asachi” Technical University of Iași, Faculty
of Hydrotechnics, Geodesy and Environmental Engineering, Iași, Romania VALENTIN BOBOC, “Gheorghe Asachi” Technical University of Iași, Faculty of
Hydrotechnics, Geodesy and Environmental Engineering, Iași, Romania
Abstract The object of the national water monitoring programs is the
evaluation and control of their quality. Monitoring data can be used to
establish initial conditions, final pollutant concentrations, but most of
the time they cannot be used to identify the stages and processes that occur
during pollution. In Botoşani County, a number of four communes were
diagnosed as vulnerable areas. This paper presents the results of the
groundwater quality monitoring in the period 2012 – 2019, in a number of 37
wells, located both in vulnerable areas, and in zones diagnosed as not being
vulnerable. The selected parameters for the monitoring are the indicators of
the nutrient regime: concentrations of nitrate, nitrite, phosphate, and
ammonium ions. By processing filed data, there is observed a decrease in the
nitrate ions concentration from two wells, during 2017 year. It was found
that in 2017 – 2019 there was a deterioration of its quality in terms of the
ammonium indicator, and in some localities both regarding nitrite and
nitrate parameters. Following the research carried out, we have proposed a
detailed action program for each area analyzed separately. Keywords:
monitoring; nitrate; pollution; underground; water quality
Qualitative Assessment of Polyphenols Extracted from Fucus Spiralis
Biomass Through High-Performance Thin-Layer Chromatography
CĂTĂLINA FILOTE, “Gheorghe Asachi” Technical University of Iaşi,
“Cristofor Simionescu” Faculty of Chemical Engineering and Environmental
Protection, Iaşi, Romania OANA TEODORA CIUPERCĂ, “Gheorghe Asachi”
Technical University of Iaşi, “Cristofor Simionescu” Faculty of Chemical
Engineering and Environmental Protection, Iaşi, Romania, Research and
Processing Centre for Medicinal Plants PLANTAVOREL SA, Piatra Neamţ, Romania
IRINA VOLF, “Gheorghe Asachi” Technical University of Iaşi, “Cristofor
Simionescu” Faculty of Chemical Engineering and Environmental Protection,
Iaşi, Romania, iwolf@tuiasi.ro
Abstract Marine macroalgae biomass is a valuable resource of bioactive
molecules and has received increased attention from the scientific community
with the goal to generate high-tech bioproducts. Polyphenols represent one
of these group of fine molecules that can be obtained from macroalgae.
Quantitative as well as qualitative extracts are of utmost importance for
the development of good macroalgal bioproducts. In this context, in order to
contribute to the current undergoing research, the present study focuses on
the assessment of polyphenols profile of extracts generated in an
ultrasounds-assisted extraction from Fucus spiralis brown macroalgae. The
qualitative analysis carried out through high-performance thin layer
chromatography (HPTLC) aims to point out the presence of polyphenolic
compounds from phenol-carboxylic acids to flavonoids and tannins.
Keywords: brown algae; polyphenols; ultrasounds-assisted extraction
extracts; thin layer chromatographyphy
Thiolated Chitosan for Biomedical Application
IOLANDA
FUSTEȘ-DĂMOC, “Gheorghe Asachi” Technical University of Iaşi, “Cristofor
Simionescu” Faculty of Chemical Engineering and Environmental Protection,
Iaşi, Romania CĂTĂLINA ANIȘOARA PEPTU, “Gheorghe Asachi” Technical
University of Iaşi, “Cristofor Simionescu” Faculty of Chemical Engineering
and Environmental Protection, Iaşi, Romania,
catipeptu@tuiasi.ro TEODOR
MĂLUȚAN, “Gheorghe Asachi” Technical University of Iaşi, “Cristofor
Simionescu” Faculty of Chemical Engineering and Environmental Protection,
Iaşi, Romania
Abstract The chitosan is synthesized from
chitin by partially de-acetylation. The free amino groups are very important
in chitosan modifications. The biodegradability, non-toxicity,
bacteriostatic and biocompatibility proprieties represent the reasons why it
is promising in different applications. The functionalization with thiol
groups with different reagents improved its qualities. The Elman’s reagent
method, the Fourier Transform Infrared (FTIR) spectra, the Nuclear Magnetic
Resonance Spectroscopy (NMR), the X-ray diffraction (XRD) analysis and the
thermogravimetric analysis (TGA)have shown improvements of the
characteristics according to the reagents used. In vivo studies have
indicated the high degree of viability of cells tested with thiolated
chitosan or formulations based on thiolated chitosan. The modified chitosan
is used for nanoparticles, liposomes coating due the strong mucoadhesive
properties and in the compositions of hydrogels, matrix tablets, hydrogels
and nanoparticles for drug release over different mucous membranes in
various diseases, for antibacterial activity or for wastewater treatment
like as bio-sorbent for methyl orange. Keywords: thiolated derivates;
biodegradability; mucoadhesive; biocompatibility; drug release
Evaluation
of the Drying Process of Some Varnishes and Paints Applied on Fir Wood
ANDREEA MIHĂILĂ, “Gheorghe Asachi” Technical University of Iași, “Cristofor
Simionescu” Faculty of Chemical Engineering and Environmental Protection,
Iași, Romania, andreea.mihaila910@yahoo.com CĂTĂLIN LISA, “Gheorghe Asachi”
Technical University of Iași, “Cristofor Simionescu” Faculty of Chemical
Engineering and Environmental Protection, Iași, Romania IOAN MĂMĂLIGĂ,
“Gheorghe Asachi” Technical University of Iași, “Cristofor Simionescu”
Faculty of Chemical Engineering and Environmental Protection, Iași, Romania
GABRIELA LISA, “Gheorghe Asachi” Technical University of Iași, “Cristofor
Simionescu” Faculty of Chemical Engineering and Environmental Protection,
Iași, Romania
Abstract Given the growing interest shown by
the population in the restoration and redecoration of their dwelling spaces,
wood is a material that has been increasingly used both in exterior
constructions and for interior finishing works. The most important stage in
the obtaining of a coat of paint able to protect wood is the drying process,
which results in a coat of paint, called film, which strongly adheres to the
surface of the wood. In order to analyse the drying process and to determine
the effective diffusion coefficients, respectively, we applied three types
of alkyd paint available on the market: a Teflon protective varnish (SLT),
yacht varnish (LYP) and superglossy enamel (ESI) on dried fir-wood disks
which were 5 mm in diameter. The drying process and the formation of the
film itself were achieved using a Mettler Toledo TGA-SDTA851e device, under
constant temperature. The effective diffusion coefficient values obtained
ranged between 0.4·10-12 and 2.4·10-12 m2/s. The theoretical models achieved
show higher deviations in the case of the SLT samples. The cause of these
deviations may be the complex composition of the paint film but also the
fact a "skin effect" film is formed after drying at linear decreasing speed,
which prevents solvent diffusion. Keywords: Paint; drying process;
effective diffusion coefficient; theoretical models; skin effect
Adsorptive Performance of Hyper-Crosslinked Polymeric Resins Compared to
Granular Activated Carbon for Toluene Vapours, under Static Conditions and
in Humid Environment
ADELA-MARILENA BUBURUZAN, "Gheorghe Asachi" Technical University of
Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection,
adelahaleta@tuiasi.ro
Abstract The purpose of this study is to evaluate the adsorptive
performance of two hyper-crosslinked polymeric resins, MN 202 and MN 250 for
toluene vapours, under static conditions. All experiments were performed in
comparison with toluene vapours adsorption on GAC-AC 20. Since the humidity
is one of the crucial parameters that dictate the efficiency of the
adsorption process, the influence of relative humidity on the toluene vapour
retention efficiency at different concentrations in system was considered.
The results included in this study show that the adsorptive performance
recorded by MN 202 and MN 250 are very closely to those recorded by AC 20.
Moreover, in the humid conditions, the polymeric adsorbents MN 202 and MN
250 behave much better than AC 20. Thus, the adsorption capacity of AC 20
decreased by 80% when the relative humidity in system increased from 0% to
97%, while adsorption capacities of MN 202 and MN 250 decreased with 40% and
respectively 50%. Keywords: adsorption; toluene; VOCs; hyper-crosslinked
polymeric resins; relative humidity; humid environment.
Empirical Modelling for the Kinetic of the Natural and Artificial
Dehydration Process for Apples and Grapes
CLAUDIA COBZARU, "Gheorghe Asachi" Technical University of Iași,
Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection ROXANA ŞTEFAN, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection GENOVEVA BORDEIANU, Tehnical
College "Danubiana" Roman, Neamţ, Romania GABRIELA ANTOANETA APOSTOLESCU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection RAMONA-ELENA TĂTARU-FĂRMUȘ, "Gheorghe Asachi" Technical University of Iași,
Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection NICOLAE APOSTOLESCU, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection CORINA CERNĂTESCU,
"Gheorghe
Asachi" Technical University of Iași, Romania, "Cristofor Simionescu"
Faculty of Chemical Engineering and Environmental Protection,
ccernat@tuiasi.ro
Abstract In this paper the artificial and natural dehydration process
kinetic for apples and grapes has been studied. Experimental data show that
natural dehydration has the disadvantages of being a slow and dragging
process, but also the benefits of preserving flavour, maintaining nutrients
and long-lasting conservation due to the low moisture content of 5-10%.
Instead, the artificial dehydration is faster but not economical, with the
possibility of caramelizing some ingredients due to the contact with the
intense heat source. Also, through modelling of kinetics the natural and
artificial dehydration process with the Table Curve 2D program has been
obtained an empirical model that successfully approximates the actual
moisture variation for the products undergoing the dehydration process at
different time values. Keywords: artificial and natural dehydration;
apples; grapes; mathematic model.
A Review on the Optimization of Lipopeptides Production
LARISA-MARIA PETRILA, "Gheorghe Asachi" Technical University of Iași,
Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection ALEXANDRA CRISTINA BLAGA, "Gheorghe Asachi"
Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection,
acblaga@tuiasi.ro FRANCOIS KRIER,
UMR TransfrontalièreBioEcoAgro N° 1158, Univ. Lille, INRAE, Univ. Liège,
UPJV, YNCREA, Univ. Artois, Univ. Littoral Côte d’Opale, ICV – Institut
Charles Viollette, F-59000 Lille, France
Abstract. Lipopeptides are a class of compounds produced by
microorganisms, which play a key role in many industries, being used in
food, cosmetic and pharmaceutical applications. Their production through
biosynthesis is influenced by a large number of factors, including the
microorganism characteristics, the operation parameters and the equipment
used for separation and purification. The large number of parameters that
can affect the biosynthesis makes the process optimization a complex task.
This paper aims to present several examples of parameter optimization for
the production of lipopeptides through biosynthesis. Keywords:
lipopeptide; biosynthesis; optimization.
Obtaining, Rheological Characterization and Thermal Degradation of Some
New Medicinal Creams
MIHAELA IVANCIA, Ion Ionescu de la Brad" University of Agricultural
Sciences and Veterinary Medicine of Iași, Romania Faculty of Animal Sciences MARICEL DANU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection GABRIELA LISĂ, "Gheorghe Asachi" Technical University of Iași,
Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection ANCA MIHAELA MOCANU, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection,
ancamocanu@tuiasi.ro
Abstract In this work was to prepared, reological characterized and
thermical degradation of creams with imidazoline and pyrazole derivatives
with various pharmacological actions. The newly obtained creams including
active substances were submitted to rheological tests by means of a modular
rheometer to made evident their properties in time and also under the
influence of certain parameters. The TG, DTG and DTA thermal analysis study
revealed the temperature range where the creams containing the active
components are thermally stable and properly used as well as the degree of
embedding of the active principle. Keywords: imidazoline and pyrazole
derivatives; rheological tests; thermal analysis.
Emulsions of Beeswax - Lavender Oil: Characteristics and Preliminary
Analysis for Use in Manufacturing of Value-Added Textiles
CARMEN ZAHARIA, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection, czah@ch.tuiasi.ro ANGELA DĂNILĂ, "Gheorghe Asachi" Technical University of Iași, Romania,
Faculty of Industrial Design and Business Management EMIL IOAN
MUREȘAN, "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection DANIELA ȘUTEU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection
Abstract This research work presents the results of preliminary
preparation and characterization of a few emulsions based on natural wax
(beeswax) and lavender essential oil using some quality characteristics
(i.e. pH, density, acidity index, peroxide index, total content of
conjugated dienes and trienes, polyphenols, flavonoids and fatty acids) as
well as sensory analysis considering as selected criteria the following
ones: adherence, degree of emulsifying, uniformity, consistence and smell.
These researches permitted the recommendation of the most corresponding
emulsion for impregnation on textile material (e.g. cotton or viscose
support) and preliminary details on the textile product design recommended
for manufacturing of added-value textile material. Keywords: emulsion;
in-time stability; physical-chemical quality indicators; sensory analysis;
textile impregnation.
Alternative Uses of Paper and Cardboard in Architecture and Construction
TEOFIL CÂMPEAN, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection; SC Rondocarton SRL, Apahida, Cluj, Romania NICOLAE PEIU, Environmental Protection Agency, Iași,
Romania MARIA GAVRILESCU, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection,
mgav@ch.tuiasi.ro
Abstract This paper developed an analysis of the relevant uses of paper
and cardboard in construction and architecture, as a basis for information
for future studies and research. In this context, based on data from the
literature it is demonstrated that it is possible that cardboard products
with sufficient compressive strength can withstand structural loads, thus
providing an alternative to the use of traditional construction materials
(concrete and steel), in the field construction and architecture. There is
also the potential for the use of cardboard as a material in the
construction of assemblies as construction elements, such as panels for
walls, roofs and floors, as well as the development of short-lived or
temporary buildings. Some houses are made of waste paper and cardboard and
can be recycled for the manufacture of cardboard. These recycling processes
involve less energy and clearly less raw materials than the production of
many other materials. Keywords: building materials; cardboard tubes;
environmental impact; insulation; recycling.
Reactive Arancio Kemazol 3R Dye Removal from Aqueous Solutions by
Adsorption onto Sawdust
CARMEN ZAHARIA, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection,
czah@ch.tuiasi.ro DANIEL FLAVIAN GRĂDINARU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection
Abstract The paper presents a few findings after some laboratory
adsorption tests onto sawdust applied to retain the reactive Arancio Kemazol
3R dye from aqueous solutions by using the ‘batchwise’ sorption technique.
For high efficiency of reactive dye removal, some operating parameters such
as initial dye solution pH (2.5-10.86), dye concentration (13-60 mg/L),
adsorbent concentration (3-80 g/L), temperature (5°C, 20°C and 40°C), and
sorption time (0.5-24 h) were studied. The best adsorption performance was
obtained at very high acidic pH (2.5-2.8), with sawdust concentration of
13-60 g/L, temperature of 5°C till 20°C, initial intermittent agitation (no
more than 3-5 min), continuous sorption operating regime, a minimum contact
time of 480 (pH=2.6), or 600 min (pH=5.40), and was varied between 54.77%
(5°C, pH=2.6 and 60 g/L adsorbent) and 44.78% (20°C, pH=2.6 and 80 g/L
adsorbent). To increase the reactive dye removal must be applied other
physical-chemical or biological treatment steps (i.e.
coagulation-flocculation, advanced oxidation/reduction, membrane processes
as ultrafiltration, ionic exchange, etc.) and obligatorily a neutralization
step. Keywords: adsorption; operating parameters; reactive dye removal;
sawdust; treatment efficiency.
A Comparative Study of Zn(II) Ions Biosorption from Aqueous Solution on
Red Marine Algae Biomass and Alginate
ALINA-ROXANA LUCACI, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection LAURA BULGARIU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection,
lbulg@tuiasi.ro
Abstract The current trend of specialized research in environmental
bioremediation is focused on studies related to the biosorption of metal
ions on biological materials. Algae biomass is of great interest due to the
significant amount of waste found on our Romanian beaches, which is why
several researchers have studied its possibility of being used in
environmental remediation processes. Because, marine algae biomass has a
modest capacity to retain metal ions from aqueous solutions, the extraction
of active compounds from their composition could be a solution to increase
biosorptive performance in metal ion removal processes. Alginate is an
active compound obtained from red marine algae biomass. In this study, we
tested the biosorption performance of red algae sp. Callithamnion corymbosum
and alginate extracted from them, in retaining Zn(II) ions from aqueous
solutions. Keywords: Alginate; red marine algae; biosorption; Zn(II)
ions; aqueous solution.
Resveratrol in the Prevention and Treatment of Oxidative Stress
DELIA TURCOV, "Gheorghe Asachi" Technical University of
Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection ANCA ZBRANCA, "Grigore T. Popa"
University of Medicine and Pharmacy of Iaşi, Romania, Faculty of Medical
Bioengineering LUIZA IOANA HORCIU, "Gheorghe Asachi"
Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection DANIELA ȘUTEU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection,
danasuteu67@yahoo.com
Abstract The therapeutic approach of some of the most frequent diseases
continues to bring about suggestions, studies and solutions regarding the
mechanisms involved in their control and the best ingredients for the
products in the treatment schemes. Among the bioactive ingredients, the
antioxidants are impressively frequent for numerous pathologies. First
ranking in this category are the diseases of the century: diabetes,
oncology, metabolic, neurodegenerative, as well as certain dermatological
diseases. Among these, rosacea, acne and venous ulcer have been most
challenging lately as a result of their etiological complexity and the
curing difficulties. As issues of great interest for scientific research,
antioxidant bioactive compounds are the focus of numerous studies regarding
solutions to optimise obtaining methods, successful associations and the
best presentation forms in order to be as patient compliant as possible.
Resveratrol is an acknowledged antioxidant, largely used both in internal
and external usage aimed products. The present paper intends to draw a
synthesis of the latest information about the role resveratrol plays in
relieving oxidative stress and to suggest new research directions.
Keywords: antioxidant; dermatocosmetics formulas; liquid-solid extraction;
oxidative stress; resveratrol.
New Dermatocosmetic Formulations Using Bioactive Compounds from
Indigenous Natural Sources
DELIA TURCOV, "Gheorghe Asachi" Technical University of
Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection LĂCRĂMIOARA RUSU, "Vasile
Alecsandri" University of Bacău, Romania, Faculty of Engineering
ANCA ZBRANCA, "Grigore T. Popa" University of Medicine and Pharmacy
of Iaşi, Romania, Faculty of Medical Bioengineering DANIELA
ȘUTEU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection, danasuteu67@yahoo.com
Abstract Along with the amazing development of the dermatocosmetic
industry, there has also been a surge in the research, concerning the
biologically active ingredients for these products. Significant growth has
taken place both in the presentation forms of the dermatocosmetic products
and in the production methods, which ensure the quality and performance of
the bioactive compounds. At the same time, special attention is paid to
those pathologies which affect the population more frequently. Among these,
rosacea, venous leg ulcer and acne have been some of the most challenging
diseases in recent years, due to the complexity of the etiology and
difficult healing. Among the most recent components of therapeutic formulas
of the above-mentioned diseases, scientific research has shown great
interest in bioactive compounds with antioxidant activity, which contribute
to combat the effects of free radicals. This paper aims to present several
examples of a series of new dermatocosmetic formulations using bioactive
compounds from indigenous natural sources, currently existing on the
dermatocosmetics products market and also, some new development directions
in this field. Keywords: antioxidants; bioactive compounds;
dermatocosmetics; indigenous flora; liquid-solid extraction.
Fuzzy Logic Methodology for Environmental Sustainability Performance
Evaluation
IONUŢ VIOREL HERGHILIGIU, "Gheorghe Asachi" Technical University of
Iaşi, Faculty of Industrial Design and Business Management, "Alexandru Ioan
Cuza" University of Iaşi, Faculty of Economics and Business Administration,
iherghelegiu@tuiasi.ro IOAN
BOGDAN ROBU, "Alexandru Ioan Cuza" University of Iaşi, Faculty of Economics
and Business Administration MARIUS PÎSLARU, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Industrial Design and Business Management ADRIAN VÎLCU, "Gheorghe Asachi" Technical University of Iaşi, Faculty of
Industrial Design and Business Management ANCA LAURA ASANDULUI,
"Alexandru Ioan Cuza" University of Iaşi, Faculty of Economics and Business
Administration
Abstract Environmental sustainability performance evaluation has
become a challenge even if the literature presents many associated
researches. This challenge is a consequence of multiple measures that can be
used to approach this phenomenon. The paper purpose is to improve the
evaluation process associated to this pillar of organizational
sustainability – environmental issue/ performance. Hence this paper aim to
propose a suitable evaluation methodology, based on fuzzy logic, for
environmental sustainability performance – focus on variables and associated
dimensions of the proposed model. Keywords: environmental performance;
EMS; suitable evaluation methodology.
Recent Advances in Anticorrosive Phosphate Pigments
NICOLAE APOSTOLESCU, "Gheorghe Asachi" Technical University of Iaşi,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection CORINA CERNĂTESCU, "Gheorghe Asachi" Technical University of
Iaşi, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection CLAUDIA COBZARU, "Gheorghe Asachi" Technical
University of Iaşi, "Cristofor Simionescu" Faculty of Chemical Engineering
and Environmental Protection RAMONA ELENA TĂTARU-FĂRMUȘ,
"Gheorghe
Asachi" Technical University of Iaşi, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection MIHAELA AURELIA
VIZITIU, "Gheorghe Asachi" Technical University of Iaşi, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection GABRIELA ANTOANETA APOSTOLESCU, "Gheorghe Asachi" Technical University of
Iaşi, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection,
ganto@ch.tuiasi.ro
Abstract This study presents the anticorrosive properties of certain
types of phosphate pigments. Anticorrosive inorganic pigments are one of the
most studied categories of pigments because, according to the existing data,
nearly one-third of the world's metal production is out of use due to
corrosion. Damage due to corrosion is often related not only to the loss of
metal but also to the decommissioning of entire installations, whose
processing and installation is spent more than the cost of the material from
which they are made. The development of new products with anticorrosive
action requires an understanding of the theoretical principles - fundamental
chemistry, as well as the parameters that influence the processing
techniques. In addition, this review will also summarize the most promising
phosphates solutions (classes of compounds, physicochemical properties,
methods of obtaining, anticorrosive efficiency) for corrosion protection of
steel, aluminium, other materials and their alloys. It also briefly presents
future directions for the manufacture of anticorrosive pigments such as
submicron anticorrosive pigments, smart coatings (e.g., corrosion sensing)
or nanotechnology. Keywords: anticorrosive inorganic pigments; corrosion
environments; phosphate pigments.
A Study of the Flammability of Magnesium in Absence of Oxygen
IOAN BARABULICĂ, "Gheorghe Asachi" Technical University
of Iași, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection,
ioan.barabulica@tuiasi.ro IOAN MĂMALIGĂ, "Gheorghe Asachi"
Technical University of Iași, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection
Abstract This study was performed to provide information on the
flammability of magnesium in absence of oxygen. An investigation of the
ignition and burning characteristics was conducted on prepared specimens of
magnesium ribbon from magnesium ribbon coil, by cutting samples 7 to 10 mm
in length and about 11 to 13 milligrams in weigh. Source of ignition was
represented by a kanthal wire that is passed through magnesium samples and
positioned on the device for connecting to electricity. The electrically
connectable device is added in to a pressure resistant chamber in volume of
350 cm3 connected with gas sources, vacuum pump and provided with an
evacuation outlet for depressurisation. Gases (CO2 and N2) was added in to
the chamber after using vacuum pump to extract the air. The major results of
the prepared specimen tests are presented as a family of curves which
indicate the heating effect of kanthal wire, the thermal effect of magnesium
ignition and the time and temperature were ignition take place. In general,
tests indicated that magnesium can ignite in gaseous mixtures of CO2 and N2.
The manner of developing combustion can be considered an indicator of
gaseous mixtures composition. Keywords: carbon dioxide; combustion; heat;
magnesium; nitrogen.
Physico-Chemical Characterization of Arabica and Robusta Spent Coffee
Blends
VICTORIA BEJENARI, "Gheorghe Asachi" Technical University of Iași,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection, victoria.bejenari@tuiasi.ro MIRELA-ANASTASIA MORARAŞ,
"Gheorghe Asachi" Technical University of Iași, "Cristofor Simionescu"
Faculty of Chemical Engineering and Environmental Protection MARICEL
DANU, "Gheorghe Asachi" Technical University of Iași, "Cristofor Simionescu"
Faculty of Chemical Engineering and Environmental Protection, "Petru Poni"
Institute of Macromolecular Chemistry of Iaşi CONSTANŢA IBĂNESCU,
"Gheorghe Asachi" Technical University of Iași, "Cristofor Simionescu"
Faculty of Chemical Engineering and Environmental Protection, "Petru Poni"
Institute of Macromolecular Chemistry of Iaşi GABRIELA LISA,
"Gheorghe
Asachi" Technical University of Iași, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection
Abstract Market surveys have lately shown that coffee is the second
best-selling commodity – after oil. Our paper is aimed at analyzing the
spent coffee blends in a professional DeLonghi coffee maker in which four
types of coffee available on the market were used. The analyzed coffee
contains blends of Arabica and Robusta coffee in various proportions. Spent
coffee blends density and viscosity was measured experimentally at different
temperatures. The browning index was measured by reading sample absorbance
at 420 nm, using a spectrophotometer. We used fir-wood boards to determine
whether spent coffee blends may be used for the beautification and
protection of wood. The contact angle was measured and values ranging from
63°and 83° were read for the treated plates, whereas the value on the
untreated control plate was 52°. These results confirm that the spent coffee
blends could be used to beautify and protect wood. Keywords: spent coffee
blends; physico-chemical characterization; density; viscosity; browning
index; contact angle keywords.
TiO2_W Material Used as Adsorbent and/or Photocatalyst in Water
Depollution
AMALIA MARIA SESCU, "Gheorghe Asachi" Technical University of Iași,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection LIDIA FAVIER, Ecole Nationale Supérieure de Chimie de Rennes,
CNRS, ISCR – UMR6226 DOINA LUTIC, "Alexandru Ioan Cuza" University of
Iași, Faculty of Chemistry GABRIELA CIOBANU, "Gheorghe Asachi" Technical
University of Iași, "Cristofor Simionescu" Faculty of Chemical Engineering
and Environmental Protection MARIA HARJA, "Gheorghe Asachi" Technical
University of Iași, "Cristofor Simionescu" Faculty of Chemical Engineering
and Environmental Protection,
mharja@tuiasi.ro
Abstract This work highlights the performance of TiO2_W material as
adsorbent and photocatalyst. The titanium dioxide was synthesized by sol-gel
method from titanium (IV) butoxide (TIBT) in presence of
cetyl-trimethyl-ammonium bromide (CTAB). The TiO2_W composite was obtained
by doping the titanium dioxide using Na2WO4 as precursor. The UV-DR and BET
analysis were used for the characterization of the obtained materials. Their
adsorption and photocatalytic efficiencies were investigated in a series of
laboratory tests performed with and without UV-A irradiation. The target
molecule was Rhodamine 6G (R6G). Experimental results clearly demonstrated
that the presence of WO3 strongly enhances the dye uptake from diluted
aqueous solutions. It was found that the sample doped with W posed high
performance in adsorption (after 30 min, the adsorption efficiency is over
80%), while the undoped TiO2 exhibits higher photocatalytic activity for
R6G. The experimental data suggested the superiority of combined
adsorption-photocatalysis in the persistent organic compounds removal. The
obtained materials can be successfully used for future applications in
advanced wastewater treatment. Keywords: adsorption; wolfram doping;
photocatalysis; Rhodamine 6G; titanium dioxide.
Multiple linear regression (MLR) models used for the prediction of
excess thermodynamic properties based on experimental determination of
refractive index
IULIANA BÎRGĂUANU, "Gheorghe Asachi" Technical University,
"Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection,
iuliana.birgauanu@yahoo.com CĂTĂLIN LISA,
"Gheorghe Asachi" Technical
University, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection SILVIA CURTEANU, "Gheorghe Asachi" Technical
University, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection GABRIELA LISA, "Gheorghe Asachi" Technical
University, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection
Abstract In engineering, it is very important to have thorough
knowledge of the thermodynamic and conveying properties of fluid mixtures,
as they are mainly used to study the interactions that occur in fluids with
several components, as well as to design various equipment for separation by
distillation, fractional distillation and solvent extraction, and to achieve
a scientific approach of the risk factors that affect separation processes.
Our research group used the statistical processing of experimental data by
the multiple linear regressions (MLR) method in order to estimate the excess
molar volume starting from the experimental values of the refractive index
for ternary systems. In this paper we will prove that this type of
experimental data processing could also be used to predict other excess
thermodynamic properties such as excess viscosity and excess surface tension
(PE). In order to achieve this goal, we will use both the literature data
and experimental data obtained in our laboratory on the thermodynamic
properties of certain fluid mixtures. The created mathematical models
correlate the excess thermodynamic properties with the refractive index, the
standard temperature and the fluid mixture composition: PE= A0 + A1X1 + A2X0
+ A3(T/298.15) + A4n, where X1 and X2 are the molar fractions, T is the
temperature expressed in Kelvin and n is the refractive index. These models
are extremely useful in practice. The refractive index can be easily
determined, with rather good accuracy and low substance consumption. These
mathematical models also allow the determination of other properties, such
as density, viscosity and surface tension, which are more difficult to
determine by experimental methods. Keywords: MLR models, density,
viscosity, surface tension, refractive index, multicomponent systems
Stabilization of w/o emulsions using ecofriendly emulsifiers
EMIL IOAN MUREȘAN, "Gheorghe Asachi" Technical University of Iasi,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection, Romania, eimuresan@yahoo.co.uk ANGELA DĂNILĂ,
"Gheorghe Asachi" Technical University of Iasi, Faculty of Industrial Design
and Business Management, Department of Chemical Engineering, Romania
Abstract An ecological emulsifier, containing a mixture of fatty acid
esters was prepared by the transesterification reaction of sunflower oil
with ethanol. The reaction was catalysed by CaO resulted from the
calcination of the eggshells. Several emulsions consisting of sunflower oil
and water, which differ from each other by the ratio between phases (70% U /
30% A, 60% U / 40% and 50% U / 50% A) and by the concentration of emulsifier
(2%, 4% and 6% respectively with respect to the vegetable oil mass), were
prepared. The influence of the emulsifier concentration and of the ratio
between phases on the stability of the emulsions were studied. The
microscopic images, the stability index values and the turbidity's values
showed that the most stable is the emulsion containing 60% U / 40% A and 4%
emulsifier. Keywords: emulsion stability, turbidity, vegetable oil,
eggshell, microscopic image
Natural dye extraction from Pelargonium roseum plants using ultrasound
method
DOINA SIBIESCU, "Gheorghe Asachi" Technical University of Iași, România,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection, dsibiesc@ch.tuiasi.ro MIHAELA VIZITIU,
"Gheorghe Asachi"
Technical University of Iași, România, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection
Abstract Dyes derived from natural sources have been used since
ancient times in households and in various fields. Subsequently, synthetic
dyes were synthesized, but in terms of toxicity, the variant in which the
existence of substances harmful to the environment is not a problem is the
first category. The aim of this paper is to discover a better solid-liquid
extraction technique to avoid the infiltration of dyes found in groundwater
following the discharge of wastewater in which they are contained. A source
of natural dyes is represented by plant materials that are used in plant
research applications, in food, as well as in the paint industries. These
could be Green wattle bark, Marigold flowers, Pomegranate rinds, Pelargonium
roseum, 4’o clock plant flowers, Cocks Comb flowers and more like these. We
used Pelargonium roseum plants. The influence of ultrasound on the
extraction of natural dyes from this material plant as a source of dyes has
been studied in comparison with the process of magnetic stirring. Analytical
studies, such as UV-VIS spectrophotometry and gravimetric analysis, were
performed on the extract. In this regard, the present paper aims at
screening the locally available natural dye yielding plants for dyeing
purpose. The effect of power ultrasound in the extraction of natural dyes
has been studied. Improving the efficiency of dye extraction from plant
materials with 87.5% by using ultrasound has led to the conclusion that this
method is much faster and more efficient than magnetic stirring.
Keywords: Pelargonium roseum, dye solid–liquid extraction, ultrasound
sonochemistry
Biosorbents based on microorganisms
ALEXANDRA CRISTINA BLAGA, "Gheorghe Asachi" Technical University of
Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection IOANA LUIZA HORCIU, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection CARMEN ZAHARIA,
"Gheorghe
Asachi" Technical University of Iași, Romania, "Cristofor Simionescu"
Faculty of Chemical Engineering and Environmental Protection LĂCRĂMIOARA
RUSU, "Vasile Alecsandri" University of Bacău, Faculty of
Engineering CRISTINA GRIGORAS, "Vasile Alecsandri" University of Bacău,
Faculty of Engineering DANIELA ȘUTEU, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection,
danasuteu67@yahoo.com
Abstract Biosorption is a technique used for the removal of not
easily biodegradable pollutants from waters (especially metals and dyes),
that can use a variety of biomaterials with adsorptive properties including
microbial microorganism (algae, bacteria, fungi), but also industrial and
agricultural wastes. The biosorption abilities of microbial biomass towards
dyes and metal ions have been extensively studied, as these biosorbents are
low-cost and ecofriendly materials for water/wastewater treatment
applications, and can be chemically modified, via various techniques, or
genetically engineered to enhance their biosorption capacity. The functional
groups, such as carboxyl, amine and phosphonate of the cell wall
constituents (peptidoglycan, manan, chitin and chitosan), offer increase
biosorption potentials. Keywords: biosorption, dyes, immobilization,
metals ions, microbial biosorbents, wastewaters
Particle air pollution (PM10) monitoring and public opinion on air
quality. A case study in northeastern Romania
BRANIȘTE MIHAELA-VICTORIA, "Gheorghe Asachi" Technical University of
Iași, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection, Romania ȘTEFAN IULIANA, "Gheorghe Asachi"
Technical University of Iași, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection, Romania ANA MELANIA,
"Gheorghe
Asachi" Technical University of Iași, Faculty of Hydrotechnical Engineering,
Geodesy and Environmental Engineering, Romania UNGA FLORIN, The Cyprus
Institute, Climate & Atmosphere Research Center, Nicosia, Cyprus MARIUS
MIHAI CAZACU, "Gheorghe Asachi" Technical University of Iasi, Department of
Physics, Romania,
cazacumarius@gmail.com
Abstract Air pollution continues to be a concern for both the
scientific community and the general population. Promoting pollution events
and the impact they could have on the environment and human health must be
an ongoing challenge. This paper presents a case study on ambient air
quality by monitoring particle concentrations (PM10) in the northeastern
part of Romania. The analysis of a survey on the opinion of the general
population regarding air quality is also presented. The research began with
our concern about the data issued by the WHO (World Health Organization)
which shows that tens of thousands of people are lost, annually, prematurely
due to pollution. Experimental data show that in some areas the
concentration of PM10 is much exceeded. Moreover, in some areas this
concentration is exceeded no less than 82 times in 7 months. At the same
time, the survey shows that people believe they are responsible for the
well-being of the environment but are not sufficiently informed about the
quality of the air they breathe. Keywords: PM10, air quality, survey
Habilitation thesis summary Micro- and nanostructured materials with applications in medicine and
environmental protection
MARGARETA GABRIELA CIOBANU, "Gheorghe Asachi" Technical University of
Iaşi, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection,
gciobanu@ch.tuiasi.ro
The Most Efficient Processing Methods for Retaining the Medical Properties of Tam Jalapeno Chili Peppers
CLAUDIA COBZARU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
ALEXANDRA CIUBOTARIU (GHEMEȘ), "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
CORINA CERNĂTESCU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection,
ccernatescu@yahoo.com
Abstract
This study aims to establish the best processing methods for chili pepper, Tam Jalapeno variety that maintains its medicinal properties. Chili pepper has been processed by irradiation, dehydration, freezing, preservation as jam and maceration in vinegar, oil and brine. The medicinal properties of chili pepper were analysed for vitamin C content, Scoville hot scale and qualitative analysis of capsaicin by thin layer chromatography (TLC). Experimental data shows that the most effective methods for conservation that maintains its medicinal properties are: dehydration, preservation in brine, maceration in oil and as jam.
Keywords: chilli; maceration; irradiation; dehydration.
Synthesis,
Characterization and Toxicity Analysis of Some Divalent Transition Metals Complexes With N-(p-nitrobenzoyl)-L-glycine
CĂTĂLINA ROȘCA, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection VALERIU ȘUNEL, "Alexandru Ioan Cuza" University of Iași, Romania, Faculty of Chemistry
MIHAELA CREȚU, "Alexandru Ioan Cuza" University of Iași, Romania, Faculty of Chemistry
MARIANA DIACONU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
BOGDAN ISTRATE, "Gheorghe Asachi" Technical University of Iași, Romania, Faculty of Mechanical Engineering
GABRIELA LISĂ, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
MIHAI IMBRIȘCĂ, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
CORNELIU STAN, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
GABRIELA ANTOANETA APOSTOLESCU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
DANIEL SUTIMAN, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection,
sutiman@ch.tuiasi.ro
Abstract
This paper presents the synthesis, structural and physico-chemical characterization of Mn(II), Co(II), Ni(II) and Cu(II) complexes with N-(p-nitrobenzoyl)-L-glycine as ligand. Firstly, four complexes were synthesized in 1:2 molar ratio, followed by their characterization and determination of their toxic potential (toxicity lethal dose) as well analysis of some antifungal and antibacterial properties. The characterization step involved the structure investigation by elemental analysis, FTIR spectroscopy, XRD, ESR and the thermal stability. Experimental data shows that all compounds have a crystalline structure (orthorhombic system) and are thermally stable up to temperatures above 100°C. Toxicity tests of new compounds were run on mice and the results indicate that the lowest value of the lethal dose is displayed by the copper compound. The biological and antifungal activities were investigated for all compounds, the cobalt compound displays the best antibacterial properties and the copper compound presents the best antifungal properties.
Keywords: divalent transitional metals complexes; N-(p-nitrobenzoyl)-L-glycine; XRD; FTIR; ESR; antibacterial and antifungal activity.
Textile Effluent Discoloration by Sorption onto Mesotrophic Peat
CARMEN ZAHARIA, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection,
czah@ch.tuiasi.ro
Abstract The paper presents a few laboratory tests of adsorption onto mesotrophic peat (MP) applied to decolorize a real textile effluent by using the ‘batchwise’ sorption technique. For high efficiency of textile effluent discoloration, there were tested the following operating parameters: pH (1.6 - 10.86), sorbent dose (4 - 40 g/L), temperature (5°, 25° and 45°C), and sorption time (till 24 h). The best sorption performance was obtained at high acidic pH (1.6), with MP peat dose of 20 - 40 g/L, temperature of 25°C, initial intermittent agitation (no more than 3 - 5 min), continuous sorption operating regime, a minimum contact time of 780, or 840 min, and was varied between 53.50% and 57.25% for color removal, and also 47.04% - 51.80% for CODCr removal.
To increase the textile effluent treatment degree can be applied also other physical-chemical or biological treatment steps (i.e. coagulation-flocculation, advanced oxidation/reduction, membrane processes as ultrafiltration, ionic exchange, etc.).
Keywords: adsorption; discoloration; textile effluent; mesotrophic peat (MP); treatment efficiency.
Simple and Rapid Spectrophotometric Determination of Au(III) Ions Using Rhodamine B As Colour Reagent
GABRIELA-TANIA DOGARU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
ELENA FILIPOV, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
IUSTINA VĂLIANU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
LAURA BULGARIU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection,
lbulg@ch.tuiasi.ro
Abstract
In this study a simple spectrophotometric method is proposed for the rapid determination of Au(III) ions from aqueous solution. The proposed method use Rhodamine B as colour reagent, and the reaction occurs immediately in strong acid media (2 N HCl solution). The purple complex shows a maximum of adsorption at 520 nm, against a blank solution. The method allows the determination of Au(III) ions in a concentration range of 1.5 – 3.5 μg·mL-1, with a molar absortivity of 8.71·105 L·mol-1·cm-1 and a detection limit of 0.18 μg·mL-1. Although the method exhibits a relatively good selectivity over other heavy metals (Pb(II), Cu(II) and Cd(II)) which may be present in different real samples, the constituents of water samples drastically interfere with the determination of ions Au(III) by the proposed spectrophotometric method, which makes this method can only be used for the analysis of laboratory solutions. Keywords: Au(III) determination; Rhodamine B; aqueous solution; spectrophotometry; simple analysis method.
Valorization of Residual Biomass as Biosorbent: Study of Biosorption Brilliant Red Dye from Aqueos Media
IOANA LUIZA HORCIU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
ALEXANDRA CRISTINA BLAGA, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
CARMEN ZAHARIA, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
SONIA DASCĂLU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
DANIELA ȘUTEU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
Abstract
A direction for the use of immobilized biomass is to obtain biosorbents to be utilized inbiosorption process of chemical pollutants applied as specific step in the treatment of industrial wastewater. The non-living Bacillus sp. and Aspergillus sp. biomass immobilized in alginate has been studied for use as a biosorbent to remove Brilliant Red HE-3B organic dye from aqueous medium. Batch experimental studies were focused on determining the influence of certain physical-chemical operating parameters of the biosorption process of the dye, such as: temperature, pH, biosorbent dose, phase contact time, chemical compound concentrations, and dose of biomass.
Keywords: biosorbent; biosorption; organic chemical pollutants; immobilization; residual biomass.
Emulsions Based on Rosemary Essential Oil – Beeswax System Used in
Manufacturing of Value – Added Textiles for Skin Care Benefits
CARMEN ZAHARIA, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection,
czah@ch.tuiasi.ro ANGELA DĂNILĂ, "Gheorghe Asachi" Technical University of
Iași, Romania, Faculty of Textiles, Leather and Industrial Management EMIL IOAN MUREȘAN, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection DANIELA ȘUTEU, "Gheorghe
Asachi" Technical University of Iași, Romania, "Cristofor Simionescu"
Faculty of Chemical Engineering and Environmental Protection
Abstract This work presents briefly the preparation methodology of nine
emulsions based on beeswax - rosemary essential oil system (iR,
i=1…9) and its specific quality characteristics, representatives being
emulsions 3R, 4R, 8R and 9R in
manufacturing of value - added textiles for aromatherapy and skin care
benefits. These prepared emulsions were preliminarily characterized by some
specific physical-chemical properties and quality indicators (i.e.
pH, absolute density, acidity index, peroxide index, content of conjugated
dienes and trienes, total content of polyphenols and flavonoids) as well as
sensory analysis which was permitted the recommendation of the most
indicated emulsion to be used by a Romanian textiles manufacturer in order
to add value to its textile products, considering emulsions in-time
stability (after 1 and 8 months of storage at room temperature) and its
potential antibacterial action after textile impregnation. This work
underlines also that the most recommendable emulsion is 4R emulsion
followed by 8R emulsion, both having a relative good in-time
stability till the separation of organic and aqueous phases as well as a
satisfactory content of polyphenols and flavonoids. Keywords:
added-value textile material; emulsion; in-time stability; physical-chemical
quality indicators; skin care benefit; textile impregnation.
Separation of Waste Industrial Gases with Magnesium
IOAN BARABULICĂ, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection,
ioan.barabulica@tuiasi.ro IOAN MĂMĂLIGĂ, "Gheorghe
Asachi" Technical University of Iași, Romania, "Cristofor Simionescu"
Faculty of Chemical Engineering and Environmental Protection
Abstract The metallic magnesium is a material with an interesting mix
of properties which makes it attractive for research area and is often found
in nature, but in a more scattered way. The disadvantages of using magnesium
came from its costs and its danger presented by the high reactivity with
gases closer to the melting point. The expensiveness of magnesium came from
the high energy intake to extract the metal from magnesium row materials
existed in nature. Over time and related to new technological development
magnesium has become a very useful material either in an elementary state or
in bind state, the fact that put pressure on optimizing production
technologies. This study uses the property to react with gases of magnesium
for some industrial applications and came with a few ideas of research
directions that can lead to energy savings, optimizing of some existent
technologies and brigs its contribution in some environmental issues.
KKeywords: magnesium; nitrogen; carbon dioxide; magnesium nitride; reactions.
The Advantages of The Households Preservation for Vegetables and Fruits
CLAUDIA COBZARU, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection CLAUDIA FELICIA CHIHALĂU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection CORINA CERNĂTESCU, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection,
ccernatescu@yahoo.com
Abstract This study presents the benefits of preserving vegetables and
fruits in households. Experimental data show that, compared to industrially
preserved food, the products preserved in households have the advantages of
simple preparation methods, without adding additives but having the same
shelf life as industrial cans or maybe even longer and that can be obtained
after a personal recipe. Keywords: industrial conservation vs.
preservation in households; vegetables; fruits; canned vegetables; canned
fruits.
Tailoring Photocatalysts Nanoarchitectonics for Degrading Industrial
Dyes
DIANA GÎLEA, "Gheorghe Asachi" Technical University of
Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection SOFRONIA DRANCA, "Gheorghe
Asachi" Technical University of Iași, Romania, "Cristofor Simionescu"
Faculty of Chemical Engineering and Environmental Protection
GABRIELA CÂRJĂ, "Gheorghe Asachi" Technical University of Iași,
Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection,
gcarja@ch.tuiasi.ro
Abstract In this work we report novel photocatalysts based on Zn -
based layered double hydroxides (LDHs), as active photocatalysts for
degrading the following industrial dyes: drimaren red (DR), drimaren navy
(DN) and nylosan (NYL). X-ray diffraction (XRD), IR spectroscopy (FTIR), and
UV–vis analyses were used to investigate the structure, composition and
photoresponsive features of the catalysts. The catalysts photoefficiency was
analyzed by UV–vis following the absorbance (A) at 283 nm, 277 nm and 567 nm
characteristic to DR, DN and NYL, respectively. The results point out that
the studied LDHs present high photocatalytic activity for the degradation of
the dyes; such that the maximum photocatalytic efficiency was about 80%. The
catalytic performances of ZnAlLDH and the derived mixed oxides are a
function of the specific composition of the clay. Keywords: layered
double hydroxides; industrial dyes; photocatalysts; environmental catalysis.
Rapid and Simple Method for The Preparation of Iron Nanoparticles
Functionalized with Alginate and Their Use as Adsorbent
ALINA-ROXANA LUCACI, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection LAURA BULGARIU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection,
lbulg@ch.tuiasi.ro
Abstract. In recent years, the use of iron nanoparticles in absorption
processes has been considered promising alternative to traditional methods,
due to the numerous advantages. The most important advantage is that iron
nanoparticles can be easily functionalized with various organic compounds
and thus their adsorbent performance can be improved. In this study, an easy
and simple method was used for the preparation of iron nanoparticles
functionalized with alginate (Fe-NPs-Alg), and the adsorbent performances of
the obtained material were tested for the removal of Cu(II) ions from an
aqueous solution.The batch absorption experiments were performed as a
function of initial Cu(II) ions concentration and contact time, at constant
initial solution pH of 4.4, adsorbent dose (2.0 g/L) and room temperature
(25 ± 1°C). The adsorption experiments showed that the Cu(II) ions
adsorption on Fe-NPs-Alg reaches the equilibrium in maximum 120 min, and the
maximum adsorption capacity is 36.53 mg/g. The results have indicate that
Fe-NPs-Alg have good adsorptive characteristics and can be used for the
removal of heavy metal ions from aqueous solution. Keywords: iron
nanoparticles; alginate; functionalization; Cu(II) ions adsorption; aqueous
media.
Electrochemical behavior of TiMoxNby alloys in simulated biological
fluid
MARIA MAGDALENA PRICOPI, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection ROMEO CHELARIU,
"Gheorghe
Asachi" Technical University of Iași, Romania, GABRIELA ANTOANETA
APOSTOLESCU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection NICOLAE APOSTOLESCU, "Gheorghe Asachi" Technical University of
Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection DANIEL SUTIMAN, "Gheorghe
Asachi" Technical University of Iași, Romania, "Cristofor Simionescu"
Faculty of Chemical Engineering and Environmental Protection,
sutiman@ch.tuiasi.ro
Abstract The present study explores the electrochemical behavior of
Ti-Mo-Nb alloys with: open-circuit potential, potential-dynamic polarization
and electrochemical impedance spectroscopy in SBF solution. The paper
presents a deep analysis of the processes that take place on the surface of
the alloy/electrolyte interface on the electrochemical behavior of the
samples under investigation. The measurements were performed in simulated
biological fluid (SBF) for one hour of immersion. The EIS results showed
that TiMoNb alloys exhibit passivity for open circuit potential.
Keywords: Ti-Mo-Nb alloys; corrosion resistance; SBF solution; biomaterial
application.
Photocatalytic degradation of cationic tri-arylmethane dye - Methyl
Violet 10B on ZnS catalysts under UV irradiation
NICOLAE APOSTOLESCU, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection IULIAN MOROȘANU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection CORINA CERNĂTESCU, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection CLAUDIA COBZARU, "Gheorghe
Asachi" Technical University of Iași, Romania, "Cristofor Simionescu"
Faculty of Chemical Engineering and Environmental Protection
RAMONA-ELENA TĂTARU-FĂRMUȘ, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection MIHAELA AURELIA VIZITIU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection GABRIELA ANTOANETA APOSTOLESCU, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection,
ganto@ch.tuiasi.ro
Abstract The presence of tri-arylmethane dyes in waste water is an
issue of major concern due to the toxic potential to the environment. The
conversion of these pollutants into mineral products with minimal energy is
a major goal of the world scientific community. In this study, we
investigate the photocatalytic degradation under UV light of Methyl Violet
10B, a complex dye with antibacterial, anthelmintic and antifungal effects,
used in local administration or in the textile industry. The reaction
conditions (irradiation time, radiation nature and catalyst loading) were
evaluated in order to obtain an optimum time to discolouration, the results
suggesting that the used ZnS can be successfully used to degrade the Methyl
Violet 10B dye. Keywords: Methyl Violet 10B; photocatalysis; ZnS
catalysts; UV light; wastewater.
Simple methods for quantitative determination of sulphate ions from
aqueous media with industrial applications
LARISA ANECHIŢEI, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection TATIANA COJOCARU,
"Gheorghe
Asachi" Technical University of Iași, Romania, "Cristofor Simionescu"
Faculty of Chemical Engineering and Environmental Protection
IOANA-GIORGIANA MUNTEANU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection LAURA BULGARIU, "Gheorghe Asachi" Technical University of
Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection,
lbulg@ch.tuiasi.ro
Abstract In this study, two simple methods (conductometric titration
and turbidimetric method) have been used for the quantitative determination
of sulphate ions from aqueous media. Both methods are based on the reaction
between sulphate ions and BaCl2, when a white precipitate (BaSO4) is
obtained. The main advantage of this reaction is that the formation of the
BaSO4 precipitate occurs almost under any experimental conditions.
Therefore, the two methods were comparatively examined to establish their
applicability limits in the quantitative determination of sulphate ions.
Thus, several important analytical parameters, such as usable concentration
range, detection limit, precision, selectivity, etc., were evaluated based
on the experimental results, in each case. The results included in this
study show that these two methods complement each other, and allow the
determination of sulphate ions from a wide range of industrial samples.
Keywords: Sulphate determination; conductometric titration; turbidimetric
method; aqueous solution; industrial applications.
Natural and artificial dehydratation of apples and bananas. Comparative
studies
CLAUDIA COBZARU, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection ANA OLTEANU, "Gheorghe Asachi"
Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection ADRIANA
MARINOIU,
National Research and Development Institute for Cryogenics and Isotopic
Technologies - ICSI Râmnicu Vâlcea, Romania CORINA CERNĂTESCU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection,
ccernatescu@yahoo.com
Abstract In this study, the natural and artificial dehydration of
apples and bananas was performed. The products were dehydrated naturally, at
room temperature, and artificially in the oven, radiator and microwave. The
resulting dehydrated products were analysed for the vitamin C and
carbohydrates content, total acidity and dry substance (in this case sugar
content). Experimental results showed that after dehydration, all products
still contain small amounts of vitamin C, and the sugar values for dried
apple samples are higher than for dry bananas. Furthermore, for all
dehydrated products, the total acidity is low and the pH is high, making
dried products, compared to fresh ones, more tolerable for consumers with
digestive problems, as detailed below. Keywords: natural dehydration;
artificial dehydration; apples; bananas.
Experimental equipments used in the study of carbon dioxide absorption
(II)
RAMONA-ELENA TĂTARU-FĂRMUȘ, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection,
rtataru@ch.tuiasi.ro RAMONA-ELENA MOLDOVANU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection MARIA HARJA, "Gheorghe Asachi" Technical University of
Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection
Abstract Carbon dioxide is a component of industrial gaseous fluxes
and is frequently removed to improve gas quality or to prevent catalyst
poisoning. It is obvious that CO2 emissions play a primary role in global
warming. There are several ways to remove CO2 - absorption, adsorption,
cryogenic separation, permeation through membranes and chemical conversion.
The industrial plant for absorption consists of the absorption unit, the
regeneration unit and auxiliary equipment. Over time, the absorption process
investigations were carried out using innovative equipment, which would
improve the performance of this process. Keywords: absorption; carbon
dioxide; experimental devices; solvents.
Synthesis and Characterization of Intermediate Azobenzene Derivatives with Terminal Polar Groups
VICTOR PRICOP, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
EMA SAVA, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
ANA CIȘLARU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
CORINA MĂLUȚAN, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
AUREL SIMION, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
IRINA CÂRLESCU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection,
icarlescu@ch.tuiasi.ro
Abstract. The paper presents synthesis and characterization of some intermediate azobenzene compounds containing polar ending groups with the purpose to obtain final bent-core liquid crystals with potential semiconducting properties. The azobenzene compounds were synthetized by diazotization and condensation reaction of the corresponding amine derivatives, 4-(trifluoromethyl)aniline and 4-aminobenzonitrile followed by esterification with 3-hydroxybenzoic acid protected previously with benzyl chloride. All the synthetized compounds were purified by recrystallization or column chromatography and their structures were confirmed by 1H-NMR and 13C-NMR studies.
Keywords: azoderivatives; 3-hydroxybenzoic acid; 4-(trifluoromethyl)aniline; 4-aminobenzonitrile.
Recycling Electronic Waste. Study for the Recovery of Precious Metals
RAMONA-ELENA TĂTARU-FĂRMUȘ, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
CORINA CERNĂTESCU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
GABRIELA ANTOANETA APOSTOLESCU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection,
ganto@ch.tuiasi.ro CLAUDIA COBZARU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
NICOLAE APOSTOLESCU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
MIHAELA AURELIA VIZITIU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
RALUCA-ELENA BACIU, "Grigore T. Popa" University of Medicine and Pharmacy of Iaşi, Romania, Faculty of Dental Medicine
Abstract This paper presents the results obtained in recovering precious metals from electronic waste (printed circuit board - PCB) by using simple mechanical and chemical procedures. Collected PCBs were disassembled and the components were separated using density and magnetic separation method. After the chemical recycling processes, the samples were examined by EDAX and SEM, the analysis showing the presence of silver in a mass percentage of 5.29%.
Keywords: gold; silver; printed circuit board; waste management.
Preliminary Studies About Co(II) Metallic Ions Retention from Aqueous Solutions onto PVA-Cellulose Composite Hydrogels
IULIA NEBUNU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
CARMEN ZAHARIA, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
RAMONA-ELENA TĂTARU- FĂRMUȘ, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
RALUCA IOANA BARON, "Petru Poni" Institute of Macromolecular Chemistry of Romanian Academy, Iași, Romania
SERGIU COSERI, "Petru Poni" Institute of Macromolecular Chemistry of Romanian Academy, Iași, Romania
DANIELA ȘUTEU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection,
danasuteu67@yahoo.com
Abstract A direction for the use of composite hydrogel based on PVA and cellulose is the preparation of efficient adsorbents in the adsorption/ sorption/biosorption processes of inorganic chemical species from aqueous systems, including wastewaters. Thus, the PVA-cellulose hydrogel (Ox25C) was studied as adsorbent in the removal of Co2+ metallic ions from aqueous solutions. Batch experimental studies focused on the determination of the influence of some important physical operating parameters on the adsorption of metallic ions, such as: pH, adsorbent dose, phases contact time, temperature, and metal ion concentration were performed. The experimental results recommend the use of PVA-cellulose composite hydrogel (Ox25C) in the removal of heavy metal ions from aqueous systems, predominantly by adsorption process types.
Keywords: adsorption; aqueous medium; hydrogel adsorbent; inorganic chemical pollutants.
Evaluation of Thermal Treatments Effect on Human Hair by Thermal Analysis
ANDREEA CĂLUIAN, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection, SC Delphi Tehnologies SRL
TOMINA BRAN, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection, Autoliv Romania
ELENA-LUIZA EPURE, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection,
lepure@tuiasi.ro
Abstract Hair provides a series of information about the health and lifestyle of people. The article’s topic is focused on the thermal analysis of different human hair samples. Three sample series were examined, so two series were prolong exposed at high and low temperatures, and the third series of samples was maintained at room temperatures. The thermal stability of these samples was evaluated using the Tonset as reference criteria. Even if small differences in the thermogravimetric behavior were observed at the analyzed samples, an interesting fact was observed in the first stage of degradation, the samples kept in warm experimental conditions had a higher thermal resistance than the similar samples from the other two series.
Keywords: human hair; residue; meteo-sensitivity; thermostability; thermal treatments.
Analysis of the Vascular Flora from a Soil Affected by Anthropogenic Sources
TEODORA ALEXANDRA ZOTICA, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection SIMONA DUMITRIȚA CHIRILĂ, "Alexandru Ioan Cuza" University of Iaşi, Romania, Faculty of Biology
CĂTĂLIN BALAN, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection
IRINA VOLF, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection,
iwolf@tuiasi.ro
Abstract The area of study (a length of 385 m and a width of 202 m), located at approximately 10 km outside Iași district (47°09'02.6"N- 27°42'51.5"E), is affected by some anthropic activities such as the proximity of transport infrastructure, accidentally waste disposal and more important by industrial activities. This paper examines the floristic elements from taxonomic, environmental preferences as well as from the phyto-economic potential point of view. This analysis is necessary in order to determine the dominant species, some of which may be considered candidates for a phytoremediation process. Moreover, these data represent inputs for a diagnostic analysis of the polluted area in order to design an ecological restoration plan.
Keywords: ecological indexes; environmental preferences; floral elements; phyto-economic potential; spontaneous flora.
TG/MS/FTIR Study of Thermal Decompositions of Some Baby
Teats
ANDREEA MIHĂILĂ, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection MĂDĂLINA MACOVEI, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection LĂCRĂMIOARA MAIECZKI, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection MARINA VODUŢ, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection NIŢĂ TUDORACHI, "Petru Poni" Institute of Macromolecular Chemistry, Iași, Romania GABRIELA LISĂ, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection,
gapreot@ch.tuiasi.ro
Abstract
Our research consisted of the determination of the mass losses and
degradation products in gaseous state obtained further to the
analysis of teats used for the feeding of babies by means of the
TG/MS/FTIR technique. The TG curve profiles are similar in the teats
made of silicone rubber, the resulting residue amounting to 57%. The
teat made of latex is almost fully degraded, the resulting amount of
residue being only 0.5%. The analysis of the MS spectra obtained at
371°C temperature has provided information of the main ionic
fragments resulting during the thermal decomposition onset stage.
The findings were also confirmed by the FTIR spectra recorded for
the same temperature. Our research also confirmed the presence of
Bisphenol A in one of the two teats made of silicone rubber. Keywords: thermal decompositions; TG/MS/FTIR; baby teats;
Bisphenol A.
Azo-Polymers – Photocromic Behaviour Studies
CRISTINA-MARIA HERGHILIGIU, "Gheorghe Asachi"
Technical University of Iași, Romania, "Cristofor Simionescu"
Faculty of Chemical Engineering and Environmental Protection,
c_paius@ch.tuiasi.ro IRINA CÂRLESCU, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection DAN SCUTARU, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection NICOLAE HURDUC, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection
Abstract
Understanding the response to illumination at molecular level and
characteristics of azo-materials features the key to new bio-science
applications and not only. Although a number of mechanisms have been
proposed, the entire process of forming structured surfaces is not
yet fully elucidated. For a better understanding of the
nanostructuration process, the irradiation studies of azo-polymeric
films were performed only in condensed phase. Response rate
evaluation of azo-polysiloxanic materials to light stimuli,
respectively the determination of the cis-trans equilibrium value
were carried out at different radiation intensity values to
highlight the phenomena occurring both at the surface and in the
film depth, within photoinduced patterning processes. Films were
irradiated in UV and VIS field. Results indicate that photochemical
response of the azo-material is different depending on its chemical
structure, irradiation wavelength, irradiation intensity value and
the film thickness. Keywords: azo-polysiloxanes; UV/Vis irradiation;
photoisomerization; bulk film.
Preliminary Assessments About the Sorbtive Properties of
New Types of Tempo-Oxidized Cellulose and Pullulan - PVA Hybrid
Hydrogels: Organic Dyes and Metallic Ions Retentions
IULIA NICA, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection RALUCA IOANA BARON, "Petru Poni" Institute of
Macromolecular Chemistry of Romanian Academy, Iași, Romania GABRIELA BILIUȚĂ, "Petru Poni" Institute of
Macromolecular Chemistry of Romanian Academy, Iași, Romania SERGIU COȘERI, "Petru Poni" Institute of
Macromolecular Chemistry of Romanian Academy, Iași, Romania DANIELA ȘUTEU, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection,
danasuteu67@yahoo.com
Abstract
Polyvinyl alcohol (PVA) is a biodegradable polymer, largely used in
the last years for the production of biodegradable hybrid materials,
as a substitute of traditional polyethylene or polypropylene
polymers. These materials have proved beneficial applications in
water filtration, paper industry, mats and films production, and
packaging. However, the PVA itself suffer of poor mechanical
strength, requiring other components able to improve this property.
Thereby, we propose the use of various amounts of natural polymers,
i.e. cellulose and pullulan, in the form of C6 oxidized derivatives,
as multifunctional key components, acting both as cross-linking
agents, but also increasing the strengthening and stiffness
properties of the as prepared hybrid PVA hydrogels. Therefore,
several hybrid PVA hydrogels, with different amounts of incorporated
polysaccharide (PVA-5P, PVA-10P, PVA-25P; PVA-5C, PVA-10C and
PVA-25C) were synthesized and tested as sorbents for two models of
dyes (Orange 16 and Methylene Blue) and Co2+ as metallic ions. Keywords: hydrogels; cellulose; pullulan; dyes; metallic ions;
sorbent.
Changes in Soil pH Due to The Use of Chemical Fertilizers
RAMONA-ELENA TĂTARU-FĂRMUȘ, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection ROXANA GEORGIANA COCEA, "Gheorghe Asachi" Technical University of
Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection ANCA ADOMNICĂ, "Gheorghe Asachi" Technical University of Iași,
Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection NICOLAE APOSTOLESCU, "Gheorghe Asachi" Technical University of Iași,
Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection, napostol@ch.tuiasi.ro
Abstract
Although soil is commonly referred to as "fertile substrate", not
all soils are favorable for crop cultivation. Soils ideal for
agriculture are balanced in terms of mineral, organic, air and
water. Each of these factors plays a direct role in obtaining a good
quality soil for agriculture. Soil pH is a very important element to
be known because it occurs in many physicochemical and biological
soil mechanisms. Optimal soil pH range for plant growth varies from
one crop to another. Generally, soil pH 6.0-7.5 is acceptable for
most plants like most nutrients are available in this pH range. The
use of mineral fertilizers, although beneficial and imperative to
obtain good qualitative and quantitative crops, changes the soil pH.
The present paper proposes a laboratory study on changes in pH
caused by the use of mineral fertilizers such as urea, ammonium
nitrate, NPK complex fertilizer, combinations of these, with or
without the addition of calcium carbonate - as an amendment. The
research has revealed the direct link between the use of fertilizers
and the modification of soil pH values.
Keywords: chemical fertilizers; NPK; soil pH; urea.
Comparative Study of Alginate Extraction Methods from Red Marine
Algae Callithamnion Corymbosum Sp.
ALINA-ROXANA LUCACI, "Gheorghe Asachi" Technical University of Iași,
Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection LAURA BULGARIU, "Gheorghe Asachi" Technical University of Iași,
Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection, lbulg@tuiasi.ro
Abstract
In recent years studies related to the metal ions biosorption on
biological materials have increased significantly. Unfortunately,
the relatively low biosorptive performances of most of natural
biomasses have determined the finding of simple and cheap methods
for the separation of various compounds from biomass composition,
which are more efficient in the biosorption processes. Alginate is
an active compound found in marine algae, and which is a great
interest in environmental engineering. In this study are adapted and
compared two methods for alginate extraction using red algae biomass
(Callithamnion corymbosum sp.) as raw material. The main advantages
and disadvantages of each extraction procedure are highlighted, in
order to provide the best way to extract the alginate from marine
algae biomass. Also, the biosoptive performances of the extracted
alginate was tested in the biosorption process of Cu(II) ions from
aqueous solution.
Keywords: Alginate extraction; red marine algae; biosorption; Cu(II)
ions; aqueous solution.
Habilitation thesis summary: Heavy Metals Removal from Wastewaters by Sorption Processes
LAVINIA TOFAN, "Gheorghe Asachi" Technical University of Iaşi,
"Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection, lavinia_tofan@yahoo.com
Abstract
The habilitation thesis presents the most significant results of the
researches oriented towards polymeric materials (organic synthetic
resins and polyurethane foams) and waste materials as sorption media
for heavy metal ions. Some new chelating sorbents have been prepared
by covalent immobilization of desired groups, also by some special,
noncovalent methods. The proposed polymer sorbents have enhanced
efficiency and good selectivity towards targeted precious and toxic
heavy metal ions. Some indigenous wastes (hemp, rapeseed, Romanian
pine bark, fly ash) have been investigated as potential sorbents for
Cu(II), Cd(II), Zn(II), Pb(II) ions. The obtained results of are
significant for the future development of the tested wastes into
beneficial materials for industrial and environmental applications.
Simple Functionalization Methods of PET Waste Using Phenolic Compounds
OANA IONELA UNGUREANU, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection ANCA MIHAELA MOCANU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection LAURA BULGARIU, "Gheorghe Asachi" Technical University of
Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection,
lbulg@ch.tuiasi.ro
Abstract The adsorptive performances of PET waste are very low, for
most of metal ions and dyes from aqueous media, and from this reason their
use as adsorbent in the environmental remediation processes, is inefficient.
Increasing the adsorption capacity of PET waste involves improving of the
number of superficial functional groups, and this can be generally done by
the functionalization with certain chemical compounds. But most of
functionalization procedure also implies the dissolving of PET waste in a
suitable solvent, which is not so easy. In this study, two phenolic
compounds (phenol and p-chloride-phenol) have been used for the dissolution
and functionalization of PET waste, to obtain new adsorbent materials with
applications in the environmental remediation. The preparation of these two
adsorbent materials were detailed discusses to highlight the main advantages
and disadvantages of each. Also, their adsorptive performances have been
tested in case of Cu(II) ions removal from aqueous media. The experimental
results have shown that the functionalization of PET waste with these
organic compounds increase the adsorption efficiency of obtained materials
for Cu(II) ions with more than 200% in case of PET waste functionalized with
p-chloride-phenol and with more than 350% in case PET waste functionalized
with phenol. This significant increase in adsorption capacity opens up new
perspectives in the use of PET waste as adsorbent material for the removal
of heavy metal ions from aqueous media. Keywords: PET waste; absorbent
material; functionalization; phenolic compounds; Cu(II) ions; aqueous media.
Efficient Fenton-Like Catalysis for Ibuprofen Degradation Under Solar
Light Using Iron and Manganese Supported on ZnAl/Layered Double Hydroxides
MIHAELA DARIE, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection GABRIELA CARJA, "Gheorghe
Asachi" Technical University of Iași, Romania, "Cristofor Simionescu"
Faculty of Chemical Engineering and Environmental Protection,
gcarja@ch.tuiasi.ro
Abstract Herein we report the fabrication of efficient photocatalysts
for degrading ibuprofen from aqueous solutions by solar light by
photocatalysis and photo-Fenton catalysis processes. Heterostructures
composites of iron or iron-manganese (Fe = 10 wt%; Mn = 4 wt%)
self-supported on the surface of zinc-based layered double hydroxides (LDHs)
were synthesized by exploiting the manifestation of the LDHs "structural
memory" effect in aqueous solutions of iron and manganese salts and further
tested as catalysts. ZnAl anionic clay (as Zn2+/Al3+ molar ratio = 3) was
obtained by coprecipitation method. The characteristics of Fe-Mn/ZnAl and
Fe/ZnAl heterostructures were described by X-ray diffraction (XRD) analysis,
Fourier transform infrared (FTIR) and solid-phase UV-Vis spectrophotometric
analyses. Photocatalytic and photo-Fenton studies were performed in batch
mode using appropriate amounts of catalysts and H2O2 as Fenton reagent. The
UNNASOL (US800, 250 W) solar simulator was used as an irradiation source and
an UV-Vis spectrophotometer to monitor the ibuprofen concentration. The
present study indicate that ibuprofen degradation for photo-Fenton process
reached a high efficiency in the presence of Fe-Mn/ZnAl and Fe/ZnAl
photocatalysts. Keywords: nanocomposite; ibuprofen; Fenton; solar light;
photodegradation.
Researches on the Biopesticides Obtained by Extraction with Non-Toxic
Solvents and the Insecticide Effect on Deposit Pests
GABRIEL DARABAN, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection MARINELA BADEANU, "Ion Ionescu de
la Brazi" University of Agricultural Sciences and Veterinary Medicine of
Iași, Romania, Faculty of Horticulture LĂCRĂMIOARA RUSU,
"Vasile Alecsandri" University of Bacău, Romania, Faculty of Engineering DANIELA
ȘUTEU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection, dsuteu@ch.tuiasi.ro
Abstract Ensuring food quality is a requirement of our days, because
people have become self-aware with their own bodies, especially ensuring and
maintaining the health and the quality of their life. In this context, is
increasing tendency towards the consumption of products containing as small
quantities of chemicals as possible, especially from the pesticide class.
Recent data show that a growing number of essential plant oils have been
tested against a wide range of arthropod pests with promising results.
Vegetal extracts have shown high efficacy, multiple mechanisms of action and
low toxicity on vertebrates. Making an overview of the scientific
achievements in the field of biopesticides it were created the premises of
the experimental study approach to find alternative solutions for the
replacement of chemical pesticides which are used in agriculture and the
food industry with biopesticides obtained from plants from the spontaneous
flora of Moldavia and Bucovina areas. In this context it was being
investigated the extraction of some chemical compounds with repellent and/or
germicidal effect on pests deposit (insect beans - Acanthoscelides
obsoletus). Keywords: biopesticides; extraction; insecticide effect;
vegetal extract.
Remediation of Aqueous Solutions Containing Zn(II) Ions by Using Wastes of Abies Alba Bark
LAVINIA TOFAN, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection CARMEN PĂDURARU, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection ,
cpadur2005@yahoo.com ION BUNIA,
"Petru Poni" Institute of Macromolecular Chemistry, Iași, Romania ROXANA LAURA
MIHĂILESCU AMĂLINEI, "Grigore T. Popa" University of Medicine and
Pharmacy, Iași, Romania, Department of Pharmacognosy, School of Pharmacy ANCA MIRON, "Grigore T. Popa"
University of Medicine and Pharmacy, Iași, Romania, Department of
Pharmacognosy, School of Pharmacy
Abstract Batch sorption capability of Romanian Abies alba
bark wastes for the removal of Zn(II) ions from diluted aqueous solutions
has been investigated as function of initial pH, sorbent dose, metal ion
concentration, temperature, and contact time. The ability of the bark waste
for Zn(II) sorption exhibited a maximum at pH 4.5-5. The percent removal of
Zn(II) from solution with an initial concentration of 71.4 mg/L varied from
15% to 87.9% for an increase of bark waste dose to 2 at 30 g/L. The
equilibrium data are best explained by both Langmuir and Freundlich sorption
isotherm. Thermodynamic parameters also favor the sorption of heavy metal
ions under study on Abies alba bark. Kinetics of sorption follows
pseudo – first order rate equation. This valuable use of Abies alba bark may
not only convert this waste material into low- cost effective sorbent, but
also provide a viable solution to its disposal. Keywords: Abies alba;;
bark; zinc; removal; waste.
Anthropogenic Pollution Due to Emission of Heavy Metals Generated from a
Lignite Thermal Power Plant in Romania
DELIA NICA-BADEA, "Constantin Brâncuși" University of
Târgu-Jiu, Romania, Faculty of Technical, Medical and Behavioral Sciences
LILIANA LAZĂR, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection BRÎNDUȘA MIHAELA SLUȘER,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection, brobu@ch.tuiasi.ro IGOR CREȚESCU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection,
icre@ch.tuiasi.ro
Abstract This experimental study addresses to the distribution of
heavy metals in the area of Turceni, as a result of anthropogenic pollution
produced by one of the biggest Romanian coal combustion thermal power plant.
The concentrations of various heavy metals (Zn, Cu, Mn, Pb, Ni, Co, Cd, and
Hg) in soil, vegetation and agricultural products was carried out by using a
high resolution analytical technique (Atomic Absorption Spectroscopy). The
monitoring area was located around the anthropogenic pollution sources i.e.
inside the power plant, around the ash deposit, and in some rural
communities located in the direction of current propagation where particles
generated by the exhaust stacks combustion are predominant distributed. The
concentration of heavy metals in plants is dependent on metal type, plant
genotype, soil and environmental conditions, decreasing as a result of
measures for limitation of emissions. The annual average concentrations do
not exceed the maximum allowed concentration, but the enclosure of power
plant and the deposit of slag and ash, which was not proved to affect the
human health. Keywords: heavy metals; atomic absorption spectrometry;
anthropogenic pollution; thermal power plant.
Simple and Rapid Spectrophotometric Method for Phenol Determination in
Aqueous Media
ALEXANDRA GEORGIANA APOSTICĂ, "Gheorghe Asachi"
Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection TATIANA ICHIM,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection VERONICA MĂDĂLINA RADU, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection LAURA BULGARIU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection,
lbulg@tuiasi.ro
Abstract Simple and selective determination of phenol from aqueous
media was spectrophotometrically examined using ferric chloride as colour
reagent. The reaction between phenol and FeCl3 occurs rapidly (1-2 min),
without to be necessary the adjustment of solution pH. The visible spectra
of the purple complex, recorded against distilled water, show a maximum at
540 nm, and the absorbance remains stable for at least 10 hours. This method
allows the determination of phenol from aqueous media in a relatively wide
concentration range (0.09 – 2.30 mg·mL-1), with acceptable detection limits.
The interferences caused by methanol, ethanol, acetone and ethylic ether
were evaluated on the basis of the selectivity coefficients. The validation
of the proposed method was done by recovery tests of phenol in tap water.
Experimental results indicate that the proposed method allows a rapid and
simple quantitative determination of phenol in aqueous media, and can be
used to test the quality of industrial effluents. Keywords: Phenol;
ferric chloride; spectrophotometric method; aqueous solution; industrial
applications.
A Suitable Method for Polyphenols Complexes with Copper
ROXANA-PETRONELA DAMASCHIN, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection VALENTIN I. POPA,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection IRINA VOLF, "Gheorghe Asachi" Technical University of Iași,
Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection, iwolf@tuiasi.ro
Abstract Polyphenols represent a class of natural compounds with
significant bioactive attributes. One of the important property of
polyphenols is the complexing of ion metals. Following this process, some
complexes with impressive antioxidant properties could be obtained. The
literature lists several methods considering different polyphenols, ion
metals and reaction solution as well as experimental conditions including
concentration, pH and temperature. This great variety of possibilities
requires an analysis to establish the suitable reaction solution and the
main parameters as well as their range of variation. Withal, some
polyphenols model molecules have to be proposed. Keywords: polyphenols;
metal ions; complex combination; reaction solution and parameters.
Synthesis, Characterization and Biological Activity Evaluation of Some
Divalent Tranzitional Metals Complexes with N-p-Nitrobenzoyl-D-L-
Phenylglycine
CĂTĂLINA ROŞCA, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection VALERIU ŞUNEL, "Alexandru Ioan
Cuza" University of Iaşi, Romania, Faculty of Chemistry MIHAELA CREŢU,
"Alexandru Ioan Cuza" University of Iaşi, Romania, Faculty of Chemistry MARIANA
DIACONU, "Gheorghe Asachi" Technical University of Iași,
Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection DANIEL MARECI, "Gheorghe Asachi"
Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection CARMEN MÎŢĂ,
"Alexandru Ioan Cuza" University of Iaşi, Romania, Faculty of Chemistry CORNEL STAN, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection GABRIELA
ANTOANETA APOSTOLESCU, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection DANIEL SUTIMAN, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection, sutiman@ch.tuiasi.ro
Abstract This paper presents the synthesis of some Mn(II), Co(II),
Ni(II) and Cu(II) complexes with N-p-nitrobenzoyl-D-L-phenylglycine (NBPG)
as ligand. The characterization of the above mentioned synthesised compounds
involved the structure determination by elemental analysis, FTIR
spectroscopy, X-ray diffraction (XRD) and electron spin resonance (ESR).
Experimental data sustain that all Mn, Co, Ni and Cu derivatives of
N-p-nitrobenzoyl-D-L-phenylglycine present a crystalline structure framed
orthorhombic system and are thermally stable up to temperatures above 100°C.
The results of the toxicity tests on mice indicated that the lowest value of
the lethal dose is displayed by the Cu complex compound. The antibacterial
and antifungal activities investigations revealed that the Co[(L)2(H2O)2]
compound displays the best antibacterial properties while the Cu[(L)2(H2O)2]
compound presents the best antifungal properties. Keywords:
antibacterial and antifungal activity; divalent transitional metals
complexes; ESR; FTIR; N-p-nitrobenzoyl-D-L-phenylglycine; XRD.
Antimicrobial Properties and Importance of Tannins for the Food
Industry
ANCA MIHAELA MOCANU, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection,
ancamocanu@ch.tuiasi.ro
Abstract The present paper is aimed to perform extended studies on
the tannins extracted from the green nuts with a special attention paid to
the separation methods and testing of the anti-microbial activity against
some gram- positive and gram-negative micro-organisms as well as against the
fungi. For finding the optimum extraction method the extractions by
mechanical stirring and in ultrasonic field were carried out while the
polyphenolic compounds were determined by applying the spectrophotometric
method. The sensitivity of micro-organisms toward the tannin compounds was
tested under the optimum standard conditions. Following the antibacterial
test the inhibitory action of the tannin compounds on the microorganisms
under study was estimated which affords their use in food industry by adding
them in various food products (cake creams, certain sausage and cheese
types). Keywords: green nuts; separation methods; microorganisms;
difusimetric method; tested activity.
Effect of Surface Morphology on Cell Growth on Polyester Films
Immobilized with Biomolecules
MIOARA DROBOTĂ, "Petru Poni" Institute of
Macromolecular Chemistry, Iași, Romania,
miamiara@icmpp.ro GRAȚIELA PIRCALABIORU, Sanimed International Impex S.R.L,
București, Romania; Research Institute of University of Bucharest, Romania MARIA
BUTNARU, Biomedical Sciences "Grigore T. Popa" University of
Medicine and Pharmacy, Iași, Romania
Abstract There are many methods to modify the surface properties of
the polymer films, such as chemical, mechanical, enzymatic or physical
treatments. The polyesters are frequently used to improve the adhesion of
the proteins and cells due to their excellent surfaces properties. The
purpose of this study was to monitoring changed surfaces in order to
improved proteins anchoring on the surface. Polyethylene terephthalate (PET)
was the designated polymer due its excellent properties. The surface of this
polymer has been investigated regarding the interactions of the polymer
surface with proteins after UV functionalization for improving the adhesion
properties using methods such as FTIR spectroscopy, scanning electron
microscopy (SEM), contact angle, and biocompatibility tests. Keywords:
cells; gelatine; hybrid materials; polar groups; UV functionalization.
Biosorbent Based on Nonliving Biomass for Textile Dye Retention from
Aqueous Media
LUIZA IOANA HORCIU, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection ALEXANDRA CRISTINA
BLAGA, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection CARMEN ZAHARIA, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection DANIELA ȘUTEU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection,
dsuteu@ch.tuiasi.ro
Abstract Due to the benefits of using microorganisms or grafting
natural materials as bio-adsorbents, the specialists’ attention has been
oriented to developing new techniques of bioremediation, as a part of the
environment biotechnologies. The article presents the results regarding the
biosorptive behavior of non-living biomass (Saccharomyces cerevisiae)
immobilized in alginate granules for removing different organic dyes (i.e.
Orange 16, Brilliant Red HE-3B, Rhodamine B, Methylene Blue) from aqueous
solution. The biosorption process has been studied in order to establish the
optimum conditions of operating process: solution pH, temperature, contact
time, initial dye concentration, and type of dye. Keywords: aqueous
media; biosorbent; biomass; biosorption; dye.
New Materials for Bone Regeneration
MARIA SPIRIDON, "Petru Poni" Institute of Macromolecular Chemistry,
Iași, Romania,
dana_spiridon_is@yahoo.com GRAȚIELA PIRCALABIORU, Sanimed
International Impex, București, Romania, Research Institute of University of
Bucharest, Romania
Abstract Tissue engineering applications are being developed with the
aim to regenerate, remodel, replace or support damaged tissues and organs.
Many types of biomaterials have been studied for this purpose. The need for
development of new biomimetic materials was the answer for many researchers.
Scaffolds utilized in diverse applications of medicine, particularly, for
bone tissue engineering must include mechanical properties, integration with
host, osteoinductive (actively induce bone formation), osteoconductive
(guide and support bone regeneration) properties and material
biocompatibility. Also they can act as three-dimensional vehicles to deliver
cells.to the human body. The best selections for bone defect repair were
considered autografts (from the patient) and allografts (from the donor).
Wheter or not multiple complications and risks were connected to the use of
both types of grafts (Logeart et al., 2005), these remain the principal
options for the doctors and patients. Bone is always colonized by
osteoblasts and osteoclast cells, so it must be considered as a living
tissue. Keywords: biomaterials; bone formation; scaffolds; tissue
engineering.
Rheological Behaviour of Some Gels Based on Gelatin
DAVID-IULIAN
LAZĂR, "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection
IULIAN AVRĂMIUC, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection CONSTANŢA IBĂNESCU, "Gheorghe Asachi" Technical University of
Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection, "Petru Poni" Institute of Macromolecular Chemistry
of Iaşi, Romania MARICEL DANU, "Gheorghe Asachi" Technical University of
Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection, "Petru Poni" Institute of Macromolecular Chemistry
of Iaşi, Romania, mdanu@tuiasi.ro
Abstract Gelatin is used as
an ingredient in many foods and pharmaceuticals as a gelling and thickening
agent. The rheological properties are very important in the study of gelatin
solutions. The change in the rheological behavior of three gels with
different gelatin concentration is investigated. Adding different amount of
gelatin in the solution causes a variation of storage modulus (G'), loss
modulus (G'') and apparent viscosity when measured as a function of strain
or frequency. The results show that rheological techniques can be used to
determine gel strength. Keywords: viscoelastic properties; structural
stability; gel strength; gelatin; rheology.
Thermal Characterization
of Chocolate. The Polymorphism of Cocoa Butter
VICTORIA BEJENARI, "Gheorghe
Asachi" Technical University of Iași, Romania, "Cristofor Simionescu"
Faculty of Chemical Engineering and Environmental Protection LAURA MIHĂILĂ,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection
ANDREEA-IOANA PRISACARIU, "Gheorghe Asachi" Technical University of Iași,
Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection GEORGIANA TĂRĂBOANŢĂ, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection GABRIELA LISA,
"Gheorghe Asachi"
Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection,
gapreot@ch.tuiasi.ro
Abstract The thermal behavior of seven chocolate samples from
various countries of origin, which cover all the three types of chocolate –
dark, with milk and white – was analyzed. They revealed the influence of
composition on thermal stability. Also, it was set out that the presence of
coffee in the composition leads to a different decomposition mechanism,
respectively, to an additional stage with the Tpeak of approximately 462ºC.
The differential calorimetry emphasized the butter cocoa polymorphism in the
composition of mass chocolate. It was concluded that a proper storage of
chocolate was urgently needed in order to avoid the emergence of the fat
bloom phenomenon. Keywords: chocolate; TG; DTG; DSC; polymorphism.
NICOLAE APOSTOLESCU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection
CORINA CERNĂTESCU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection CLAUDIA COBZARU, "Gheorghe Asachi" Technical University of Iași,
Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection RAMONA-ELENA TĂTARU-FĂRMUȘ, "Gheorghe Asachi"
Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection MIHAELA AURELIA VIZITIU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection
GABRIELA ANTOANETA APOSTOLESCU, "Gheorghe Asachi" Technical University of
Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection, ganto@ch.tuiasi.ro
Abstract Requirements for high performance pigments and special pigments led to the
development of materials that must comply with the increasingly demanding
economic market. Manufacturers of these categories of materials work to
produce excellent durability, high colour strength, the excellent
dispensability across a wide range of binders, chemical stability and low
solubility. The paper presents the current literature information on
transparent inorganic pigments and their optical properties. Also, the main
classes of transparent inorganic pigments are presented with synthesis,
structural properties and applications. Keywords: transparent inorganic
pigments; refractive index; iron oxides; ZnO; TiO2.
Leaching Kinetics of a Fluidized Bed with High Salt Concentration
MARCELA POPA, "Gheorghe Asachi" Technical University of
Iaşi, Faculty of Chemical Engineering and Environmental Protection
EUGENIA TEODORA IACOB-TUDOSE, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection IOAN MĂMĂLIGĂ, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection, imamalig@tuiasi.ro
AbstractThe purpose of this study was to determine the mass transfer
coefficient in the extraction of a solute from a solid matrix by contacting
it with a solvent in a fluidized bed. The solvent used to remove the solute
is, at the same time, fluidizing agent. The results presented had been
obtained for the dissolution of a high concentration of a solute in the
solid phase by using the recirculating extraction fluid phase.
Keywords: mass transfer coefficients; solid-liquid extraction; fluidized
bed; extraction with fluid recirculation.
Characteristics of Oil Obtained from Grape Seeds Separated from Dried
and Fresh Marc
CLAUDIA COBZARU, "Gheorghe Asachi" Technical University
of Iaşi, Faculty of Chemical Engineering and Environmental Protection
MIHAELA ALINA MATCABOJĂ (GHERASIM), "Gheorghe Asachi"
Technical University of Iaşi, Faculty of Chemical Engineering and
Environmental Protection ADRIANA MARINOIU,
National R&D Institute for Cryogenics and Isotopic Technologies-ICIT,
Râmnicu Vâlcea
GABRIELA ANTOANETA APOSTOLESCU, "Gheorghe Asachi"
Technical University of Iaşi, Faculty of Chemical Engineering and
Environmental Protection RAMONA ELENA TATARU FĂRMUȘ,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection CORINA
CERNĂTESCU, "Gheorghe Asachi" Technical University of Iaşi, Faculty
of Chemical Engineering and Environmental Protection,
ccernatescu@yahoo.com
AbstractIn this study, oil was extracted from seeds separated from
dried and fresh marc, in controlled conditions, marc being a residue from
homemade wine manufacturing process. The organoleptic and physico-chemical
characteristics show that this oil belongs among vegetable food oils. Also,
marc, considered to be a waste product from wine manufacturing, can be an
alternative source for making edible oil.Keywords: marc; oil; grape
seeds.
Studies on the Photocatalytic Decomposition of Organic Dyes Using
Mesoporous Metal Oxides
NICOLAE APOSTOLESCU, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection RAMONA ELENA TATARU FĂRMUȘ,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection CORINA CERNĂTESCU,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection
CLAUDIA COBZARU, "Gheorghe Asachi" Technical University
of Iaşi, Faculty of Chemical Engineering and Environmental Protection
MIHAELA AURELIA VIZITIU, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection GABRIELA ANTOANETA APOSTOLESCU,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection,
ganto@ch.tuiasi.ro
AbstractIn this study, the ultraviolet irradiation behaviour of three
dyes (methylene blue - MB, phenol red - FR and crystal violet - CV) is
presented in the presence of a mesoporous oxide material based on ZnO-CeO2.
The three dyes were degraded to the corresponding leucoderivates in
different times, methylene blue (conc. 10-5M) in 25 min, crystal violet
(conc. 2·10-5M) in 90 min, and phenol red (conc. 4.5·10-5M) in 140 min.
Also, the calculated photodegradation yield showed that MB and CV degraded
by 98% and RF only by 78%. It was also investigated the influence of the
photocatalyst concentration on the reaction rate for MB.Keywords: crystal
violet; photodegradation; phenyl red; methylene blue.
Studies Regarding Au(III) Extraction in Aqueous Two Phase Systems Based
on Polyethylen Glycol with Different Molecular Weights
MĂDĂLINA GHERCĂ, "Gheorghe Asachi" Technical University
of Iaşi, Faculty of Chemical Engineering and Environmental Protection
LAURA BULGARIU, "Gheorghe Asachi" Technical University of
Iaşi, Faculty of Chemical Engineering and Environmental Protection,
lbulg@ch.tuiasi.ro
AbstractThis study presents the efficiency of Au(III) ions extraction
in aqueous two phase systems (ATPS) based on polyethylene glycol (PEG) 40%
(w/w) and (NH4)2SO4 40% (w/w), in the presence of chloride ions with a
concentration of 0.5 mol/L as extracting agents and a pH of 4.5 of the
inorganic salt. The influence of two experimental parameters was studied:
PEG molecular weight and volume ratio between the two phases. Experimental
results showed that with the increasing of the PEG molecular weight the
quantity of Au(III) ions extracted in PEG rich phase increases (67.78% for
PEG(2000), 75% for PEG(4000) and 86.19% for PEG(6000), values obtained for a
volume ratio (NH4)2SO4 : PEG of 5:4). Also, the extraction efficiency showed
an important decrease for a (NH4)2SO4 : PEG volume ratio >2 because of the
hydrophobicity of the environment that decreases.Keywords: Au(III) ions
extraction; aqueous two phase systems; PEG; green chemistry.
Polyphenolic Content Evaluation in Branches of Rosa Canina L.
and Hippophae Rhamnoides L. Species
OANA TEODORA CIUPERCĂ, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection, Research and Processing Centre for Medicinal Plants
"Plantavorel" S.A., Piatra Neamț CARMEN ELENA ȚEBRENCU,
Research and Processing Centre for Medicinal Plants "Plantavorel" S.A.,
Piatra Neamț IRINA VOLF, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection, iwolf@ch.tuiasi.ro
AbstractThis study evaluated the branches of Rosa canina L.
and Hippophae rhamnoides L. in order to highlight new sources of
polyphenols, condensed tannins and flavonoids. The phytochemical screening
and ultraviolet-visible and Fourier transform infrared spectroscopy analysis
on biomass showed the presence of fine chemical constituents like
polyphenols, flavonoids (rutin) and condensed tannins (catechin,
epicatechin). The biomass has been evaluated to quantify the total
polyphenols (gallic acid) and tannins (tannic acid) by instrumental methods
(UV-VIS spectrometry). The results showed that the branches of R. canina
contain polyphenols (1.77±0.067%g gallic acid equivalent/g) and tannins
(1.45±0.029%g tannic acid equivalent/g), whilst the branches of H.
Rhamnoides are somewhat richer (1.87±0.058%g gallic acid equivalent/g
and 1.94±0.038%g tannic acid equivalent/g). These results open perspectives
for advanced valorization of R. canina and H. rhamnoides
branches, already known only for phytotherapeutical and nutritional
potential of their fruits. Keywords: Rosa canina; Hippophae
rhamnoides; branches; polyphenols; tannins; phytochemical screening.
Magnetic Activated Carbon Composites Used as Fenton Like Catalysts for
Photodegrading Organic Compounds in Aqueous Solutions
ANDREEA VAJDA, "Gheorghe Asachi" Technical University
of Iaşi, Faculty of Chemical Engineering and Environmental Protection
MARIUS SEBASTIAN SECULA, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection,
mariussecula@ch.tuiasi.roLAURA HAGIU-ZALESCHI, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
ProtectionGABRIELA
CARJA, "Gheorghe Asachi" Technical University of Iaşi, Faculty of
Chemical Engineering and Environmental ProtectionIOAN MĂMĂLIGĂ,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection
AbstractThe main goal of the present work consists in investigating
the performance of several magnetic activated carbon composites towards the
photo-Fenton degradation of Ibuprofen molecule. Three Granular Activated
Carbon (GAC) matrices having different pHPZC were employed to prepare the
magnetic GACs using the co-precipitation method. UV light irradiation tests
were carried out to determine the performance of the prepared magnetic
composites towards the degradation of Ibuprofen molecule in aqueous solution
in the presence of Hydrogen Peroxide. The photo-Fenton tests were conducted
after the adsorption equilibrium has been established. The magnetic GAC
composites prepared with acid-surfaced matrix L27 GAC was found to enhance
significantly the degradation process of Ibuprofen molecule.Keywords:
Magnetic composites; photocatalysis; Fenton reaction; Ibuprofen;
micropollutant
Modelling the Free Radical Polymerization of Styrene Using Artificial
Neural Networks
LUCIANA GHIBA, "Gheorghe Asachi" Technical University of Iaşi, Faculty
of Chemical Engineering and Environmental ProtectionELENA-NICULINA DRĂGOI,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental ProtectionSILVIA CURTEANU,
"Gheorghe
Asachi" Technical University of Iaşi, Faculty of Chemical Engineering and
Environmental Protection,
scurtean@tuiasi.ro
AbstractIn this work, the modeling of free radical polymerization of
styrene is performed using two approaches: phenomenological and empirical.
In the last case, artificial neural networks are used, applying two working
strategies. First, a single model with three outputs (monomer conversion,
numerical molecular weight and gravimetrical molecular weights) based on
time, temperature and initial concentration of the initiator (model inputs)
was determined. Due to the unacceptable performance results for the
molecular weights, a second strategy is developed, modelling each output,
separately, as function of the three inputs. Different artificial neural
network topologies were tested, the two hidden layer networks performing the
best for all the outputs.Keywords: styrene; modelling; prediction;
artificial neural networks.
ANA-MARIA CHEŞCĂ, "Gheorghe Asachi" Technical University of Iaşi,
Faculty of Chemical Engineering and Environmental Protection BOGDAN
MARIAN TOFANICĂ, "Gheorghe Asachi" Technical University of Iaşi, Faculty of
Chemical Engineering and Environmental Protection ADRIAN CĂTĂLIN PUIȚEL,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection,
puitelac@tuiasi.ro DAN
GAVRILESCU, "Gheorghe Asachi" Technical University of Iaşi, Faculty of
Chemical Engineering and Environmental Protection
Abstract Straws and stalks are important categories of
lignocellulosic agri- wastes. The availability of these materials is high,
taking into account their extended cultivation. Their chemical composition
represents an argument for their use as feedstock for papermaking fiber
production. In this study, soda pulping process was employed for
delignification of wheat straws (Triticum aestivum), corn stalks (Zea mays),
rapeseed (Brassica napus) and sunflower (Helianthus annuus). The obtained
pulps have been characterized from the perspectives of papermaking. Lignin
separated from spent liquors resulted from pulping of agri-wastes is an
alternative to increase overall process feasibility. In such context, the
separated spent liquors were acid treated for lignins separation, which were
further characterized by UV and IR spectroscopy techniques and gel
permeation chromatography. The obtained results are important in
establishing the potential usage of such lignins. Keywords: straw;
stalks; pulp; paper; lignin.
XRD Analysis of the Structural Properties of Layered Double Hydroxides
Comprising Zn and Al Partially Substituted with Cu and Ce and their Derived
Mixed Oxides
DIANA GILEA, "Gheorghe Asachi" Technical University of Iaşi, Faculty of
Chemical Engineering and Environmental Protection,
gilea.diana91@gmail.com GABRIELA CARJA,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection,
gcarja@ch.tuiasi.ro
Abstract The structural changes of layered double hydroxides (LDHs), when
zinc was partially substituted by copper and aluminum was partially substituted
by cerium in the layer of the LDHs matrix was monitored by X-ray diffraction
(XRD), while the bulk composition of the studied samples was confirmed by X-ray
fluorescence (XRF). The substituted samples preserved the layered structure, but
the constrictions of the network appeared as a result of the substitution. After
calcination at 850°C for 7 h, well crystallized mixed oxides containing copper
and cerium were formed. The results point out that the calcination temperature
is important to establish the structural features of the resulting mixtures of
mixed oxides. Keywords: layered double hydroxides; XRD; mixed oxides;
copper; cerium
Diffusion Coefficients from Sorption Experimental Data
IONUŢ OVIDIU FORŢU, "Gheorghe Asachi" Technical University of Iaşi,
Faculty of Chemical Engineering and Environmental Protection RODICA SERETEANU,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection EUGENIA TEODORA IACOB
TUDOSE, "Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection, etudose@tuiasi.ro IOAN MĂMĂLIGĂ,
"Gheorghe Asachi"
Technical University of Iaşi, Faculty of Chemical Engineering and
Environmental Protection
Abstract The diffusion of volatile components trough polymers or other
materials of different geometry (plane, spherical or cylindrical) is essential
for many industrial applications. In order to characterize the mass transport in
these processes, an effective diffusion coefficient is needed. The diffusion
coefficients estimation, usually using indirect methods, is based on
experimental measurements of volatile components diffusion, retained on
sorbents. Hence, the diffusivity is assessed by measuring pressure, sample
weight or concentration, externally. These calculations require an appropriate
model which describes the processes and the occurring transport phenomena. In
this paper we present estimations of the diffusion coefficients using
theoretical and experimental methods. These experimental methods are based on
the kinetics of the solvent retention within materials of different shapes.
Keywords: cylindrical geometry; diffusion; planar geometry; process; spherical
geometry.
Conformational Analysis of Polysiloxanes Substituted with Azobenzene
SIMONA CIOBOTĂRESCU, "Gheorghe Asachi" Technical University of Iaşi,
Faculty of Chemical Engineering and Environmental Protection, University of Angers, France
Physics Department
ELENA-LUIZA EPURE,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection, lepure@tuiasi.ro NICOLAE HURDUC,
"Gheorghe
Asachi" Technical University of Iaşi, Faculty of Chemical Engineering and
Environmental Protection
Abstract This work presents a molecular modeling study with regard to the
conformational behaviour of azo-polysiloxane in function of the content in cis
azobenzene (CA). Molecular dynamics was used to carry a NVT simulation of
azobenzene substituted polysiloxane in bulk. Conformational analysis was
performed to determine how the CA concentration affects the polymeric chain’s
three-dimensional structure. The radius of gyration was found not to change with
the variation of CA content, while the potential energy increased with the
increasing of CA percentage. The low change in free volume from one structure to
another supports the constant radius of gyration. The correlated results suggest
that the CA brings conformational tension on the structure. The macromolecular
chain is unable to position itself in a less structural conflictive arrangement
and determines a growth in potential energy. More studies are needed for further
investigation and to link these findings with simulations in layer and solution.
Keywords: molecular modelling; azo; isomerisation; configuration.
Iron Based Layered Double Hydroxide and its Calcined Derivate as
Efficient Photocatalysts in Phenol Removal
ELENA-FLORENTINA GROSU, "Gheorghe Asachi" Technical University of Iaşi,
Faculty of Chemical Engineering and Environmental Protection,
elena_grosu89@yahoo.com GABRIELA CARJA,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection,
gcarja@ch.tuiasi.ro
Abstract We report here the fabrication of novel semiconductor
photocatalysts with high efficiency in the advanced oxidation reactions. Layered
double hydroxides (LDHs) are nontoxic and environmental friendly anionic clays
studied due to their photoresponses under UV, visible and solar irradiation. In
this work ZnFeAlLDH and the derived mixed oxides obtained after calcination,
denoted as ZnFeAl750 were synthesized and used for the first time in the process
of phenol photodegradation under irradiation with a solar simulator. The
structure and the optical properties of the catalysts were studied by XRD, FTIR
and UV-Vis techniques. The photocatalytic tests were done using a solar
simulator. The results demonstrate that ZnFeAlLDH has a specific hydrotalcite
structure that transformed into highly homogeneous mixed oxides after
calcination at 750°C. The tested catalysts are able to absorb light starting
from the red region of the spectrum. Results show that the maximum
photodegradation of phenol was reached with ZnFeAl750, which removed 70% from
the initial concentration of the phenol pollutant after 6 h of irradiation with
solar light. Keywords: LDHs; photocatalyst; mixed oxides; pollutant; phenol;
solar photodegradation.
Habilitation Thesis Summary: Design of High Performing
Materials with Increased Thermal Stability: Structure-Property Relationship
and Degradation Mechanism
GABRIELA LISA, "Gheorghe Asachi" Technical University
of Iaşi, Faculty of Chemical Engineering and Environmental Protection,
gapreot@ch.tuiasi.ro
Photocatalytic and Photo-Fenton Degradation of Ibuprophen under Solar Light
Irradiation
MIHAELA DARIE, "Gheorghe Asachi" Technical University of
Iaşi, Faculty of Chemical Engineering and Environmental Protection,
ddariemihaela@yahoo.com GABRIELA CARJA,
"Gheorghe Asachi" Technical University of
Iaşi, Faculty of Chemical Engineering and Environmental Protection,
gcarja@ch.tuiasi.ro
Abstract
In this work, the degradation of pharmaceutical agent ibuprofen by
photocatalysis and photo-Fenton catalysis, using artificial visible
light irradiation and H2O2 as Fenton reagent, was carried out. Two
efficient Fe/LDHs photocatalysts with different iron content were
fabricated. First, the LDH precursor with Zn2+ and Al3+ as di- and
trivalent brucite-like cations (Zn2+/Al3+ = 3/1) was obtained by
co-precipitation method and denoted as Zn3Al. Then, by the
structural reconstruction of the calcined Zn3Al in aqueous solution
of FeSO4∙7H2O, two Fe/LDH- based nanocomposites were obtained and
denoted as Fe(1%)Zn3Al and Fe(4%)Zn3Al. The structural and optical
properties of the samples were studied by XRD, FTIR and UV-Vis
techniques. The photocatalytic tests were performed using a solar
simulator as irradiation source. Photocatalytic results showed that
the novel catalysts is efficient for the ibuprofen degradation. A
remarkable enhancement of Ibuprofen degradation was obtained in the
case of photo-Fenton process, up to 89% by Fe(1%)Zn3Al
nanocomposite. Increasing the content of Fe in the catalysts showed
an insignificant effect in enhancing the catalyst efficiency for
ibuprofen removal. Keywords: photocatalyst; ibuprofen; photo-Fenton; solar photodegradation.
Opportunity to Apply Thermal Decomposition of Spruce Bark after Extractives
Recovery
OANA ALEXANDRA PĂTRĂUŢANU, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and
Environmental Protection
MIHAI BREBU, "Petru Poni" Institute of Macromolecular
Chemistry, Iaşi
VALENTIN I. POPA, "Gheorghe Asachi" Technical University of
Iaşi, Faculty of Chemical Engineering and Environmental Protection
IRINA VOLF, "Gheorghe Asachi" Technical University of Iaşi,
Faculty of Chemical Engineering and Environmental Protection,
iwolf@tuiasi.ro
Abstract
The work explores the possibility to use the thermal decomposition
of spruce bark (Picea Abies) in a second biorefinery flow
sheet. Spruce bark was characterised and humidity, ash,
hemicelluloses, cellulose and lignin content were determined. For
the recovery of extractives two procedures were applied: the biomass
was extracted with toluene-ethanol mixture using a conventional
extraction and a 70% ethanol solution was used in an ultrasound
assisted extraction process. In both cases the solid waste was
subjected to pyrolysis conducted at 550°C under relatively low
heating rate of 10°C/min. The aqueous phase was analysed by GC-MS.
Similarities and some differences are highlighted by the
GC-chromatograms and NP-gram characterisation, depending on the
extraction procedures applied. Keywords: biomass; extractives; pyrolysis;
GC-MS; NP-gram.
Cellulosic Fibers from Miscanthus
CRISTIAN IONUȚ SANDU, "Gheorghe Asachi" Technical University of Iaşi,
Faculty of Chemical Engineering and Environmental Protection ANA-MARIA
CHEȘCĂ, "Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection ADRIAN CĂTĂLIN PUIȚEL,
"Gheorghe
Asachi" Technical University of Iaşi, Faculty of Chemical Engineering and
Environmental Protection DAN GAVRILESCU, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection, gda@tuiasi.ro
Abstract Miscanthus is an important biomass crop and has an
important role in the sustainable production of renewable fuels and
chemicals. It is currently used as a source of heat and electricity, or
converted into biofuel products. There are many possibilities to valorize
Miscanthus crops: combustion, gasification and pyrolysis for
energy; liquefaction and hydrolysis for chemicals; delignification for
cellulosic fibers. Chemical composition of Miscanthus is
encouraging regarding its cellulose and lignin content, making them suitable
for delignification. Miscanthus pulp can be obtained by usual
delignification processes, among them soda cooking being very attractive.
Pulps having different yields and lignin content were obtained by suitable
choosing of the cooking parameters: NaOH addition, time and temperature. The
strength properties of pulp mainly depended on its lignin content.
Lignin-rich pulps show high compressive strength, being appropriate in paper
manufacturing for corrugated board production. Keywords: Miscanthus
crop; soda cooking; chemical pulp; pulp properties; paper.
Biosorption Potential of the Main Fractions Separated from Peat (Poiana
Stampei, Romania)
SILVIA PRUTEANU, "Gheorghe Asachi" Technical University of Iaşi, Faculty
of Chemical Engineering and Environmental Protection LAURA BULGARIU,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection,
lbulg@ch.tuiasi.ro MARIA GAVRILESCU,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection
Abstract In this study it was investigated the separation possibility
of the main organic fraction of peat (Poiana Stampei, Romania), consisting
in humic substances and cellulosic waste, for its use as biosorbents in the
removal process of Cu(II) ions from aqueous solution. In order to separate
the two fractions, the peat was treated with sodium hydroxide solutions of
different concentrations (0.1 – 4.0 N), at two different temperatures (20
and 50°C) for 3 h of mixing. In this way, only the solubilisation of humic
substances from the peat composition takes place, which can be separated
from cellulosic waste by filtration. After filtration, the humic substances
were re-precipitated in strong acid media (pH < 1.0), and then both obtained
fractions were washed and dried in air. The efficiency of separation process
was evaluated in each case. All resulted fractions were used as biosorbents
for the removal of Cu(II) ions from aqueous solution. The experimental
results have shown that the fractions separated by the treatment of peat
with 2N NaOH solution at 50°C exhibit the highest biosorption capacities.
Keywords: peat; humic substances; cellulosic waste; Cu(II) ions;
biosorption.
Pb(II) Removal from Aqueous Solutions by Using Wastes of Pinus Strobus
Bark
LAVINIA TOFAN, "Gheorghe Asachi" Technical University of Iaşi, Faculty
of Chemical Engineering and Environmental Protection CARMEN PĂDURARU,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection,
cpadur2005@yahoo.com ION BUNIA,
"Gheorghe Asachi"
Technical University of Iaşi, Faculty of Chemical Engineering and
Environmental Protection ROXANA LAURA MIHĂILESCU AMĂLINEI,
"Gheorghe
Asachi" Technical University of Iaşi, Faculty of Chemical Engineering and
Environmental Protection ANCA MIRON, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection
Abstract The influence of significant operational parameters on the
Pb(II) sorption process by Romanian Pinus strobus has been studied
in batch conditions. The uptake of Pb(II) from solutions with different
initial concentrations of Pb(II) increased progressively with increasing
initial pH from 2 to 5-5.5. The percent removal of Pb(II) varied from 84% to
98% for an increase of bark waste dose to 4 at 60 g/ L. The sorption
isotherm studies clearly indicated that the sorptive behavior of Pb(II) ions
on Romanian Pinus strobus bark under study satisfies not only the
Langmuir assumptions, but also the Freundlich assumption. The calculated
values for the isothermal thermodynamic parameters show that Pb(II) ions
retention by pine bark is a spontaneous process of endothermic and chemical
nature. The sorption kinetics for Pb(II) ions removal from aqueous solutions
was very well described by pseudo-second order model. Keywords: Pinus
strobus; bark; sorption; waste; lead.
Potential Antimicrobial Activity of Some New Compounds
Against Pathogenic Strains
ANCA MIHAELA MOCANU,
"Gheorghe Asachi" Technical University of Iași, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental
Protection,
ancamocanu@ch.tuiasi.ro
Abstract:
The objective of this study is to evaluate antibacterial activity of
new compounds obtained by the condensation of hydrazides with
several substrata (aldehides, transition metals and coupling
compounds) affording final compounds with potential biological
activities such antibacterial, antifungal, antiviral, antitumor
activity, fungicidal, tuberculostatic and plant growth regulative
properties. The new compounds were studied for antibacterial
activities, in vitro, by measuring zone diameters of bacterial
growth inhibition on different types of strains microorganisms:
Escherichia coli, Staphylococcus aureus and
Pseudomonas aeruginosa. The newly analyzed compounds exhibited
a variable activity of inhibition on the growth of the bacteria.
Keywords: hydrazide, coupling
compounds, microorganisms, difusimetric method, tested activity.
Applications of Reaction Calorimetry in Lignin Chemistry
VALENTINA IORDAN (CONSTANTIN), "Gheorghe Asachi"
Technical University of Iași, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection TEODOR MĂLUȚAN, "Gheorghe Asachi" Technical
University of Iași, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection,
thmalu@tuiasi.ro
Abstract
The thermodynamic properties of lignin and its solutions are
important in the design and operation of the machines used in the
biomass biorafination schemes. In the literature, there are few
thermodynamic data on the main chemical components of biomass
(cellulose, hemicellulose and lignin). In this paper we present the
heat dissolution (ΔHdis) of the lignin alkaline solutions obtained
by the reaction calorimetry. Lignin is characterized by insolubility
in most simple solvents. The solubility of lignin preparations also
depends on the method used to isolate them.
Since most of the applications in which lignin is subjected to
chemical reactions involves the dissolution of lignin, it is very
important to know the thermodynamic properties of these solutions as
well as the characterization of chemical reactions in terms of heat
of reaction. Keywords: lignin; reaction heat; dissolving
heat; specific heat; biomass.
Experimental Equipment Used in the Study of Carbon Dioxide
Absorption (I)
RAMONA ELENA TĂTARU FĂRMUȘ, Gheorghe Asachi"
Technical University of Iași, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection,
rtataru@ch.tuiasi.ro MARIA HARJA, "Gheorghe Asachi" Technical University
of Iași, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection
Abstract
The continuing increase demand in global energy has led a faster raw
material depletion and increased exploitation of hydrocarbon fuels.
Before using natural gas, it is necessary to remove acid gases (H2S
and CO2), to increase the heating value of natural gas, reduce
corrosion, prevent atmospheric pollution. Acid gas removal is best
accomplished by chemical absorption. Such washing processes are also
used in petroleum refining, coal gasification and hydrogen
production. This paper presents a brief chronology of experiments
conducted in the study of carbon dioxide absorption in amine
solutions, focusing on experimental equipment developed in
laboratory research. Keywords: acid gases; carbon dioxide;
experimental devices; flow of absorption.
Microcrystalline Cellulose as Adsorbent for Removal of Dyes from
Wastewaters
IULIA NICA, "Gheorghe Asachi" Technical University
of Iași, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection GABRIELA BILIUȚĂ, "Petru Poni" Institute of
Macromolecular Chemistry of Romanian Academy, Iași SERGIU COȘERI, "Petru Poni" Institute of
Macromolecular Chemistry of Romanian Academy, Iași CARMEN ZAHARIA, "Gheorghe Asachi" Technical
University of Iași, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection DANIELA ȘUTEU, "Gheorghe Asachi" Technical
University of Iași, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection,
danasuteu67@yahoo.com
Abstract
Batch adsorption studies were carried out for the adsorption of some
dyes (Brilliant Red HE-3B, Orange 16, Rhodamine B and Methylene
Blue) onto a new versatile cellulose-based product (Cellet), to be a
new adsorbent. Studies were shown that the adsorption process is
influenced by the chemical structure of dyes and experimental
working conditions, i.e. pH, initial dye concentration,
cellulose dose, phases contact time and temperature. The obtained
results were shown that this cellulose-based product (Cellet) can be
use as an adequate adsorbent in discoloration of textile effluents. Keywords: adsorption; aqueous medium;
microcrystalline cellulose; organic dye.
Influence of Natural Extracts on the Quality of Cold Sodium Soap
CLAUDIA COBZARU, "Gheorghe Asachi" Technical
University of Iași, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection CRINA CALENCIUC, "Gheorghe Asachi" Technical
University of Iași, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection ADRIANA GHEORGHINA, "Gheorghe Asachi" Technical
University of Iași, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection
CORINA CERNĂTESCU, "Gheorghe Asachi" Technical University
of Iași, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection,
ccernatescu@yahoo.com
Abstract
In this study, toilet soaps containing a mixture of natural fruit
and vegetable extracts were prepared. The results show that the
three vegetable oils (olive, palm and coconut oil) used as a source
of fatty acids, due to their acidity index, iodine and
saponification index, are a good raw material for making soap.
Furthermore, they contain vitamins and antioxidants, which, together
with those contained in the natural extracts mixture obtained from
fruits and vegetables, helps to improve the softening and soothing
properties of the soap. However, anthocyanin pigments from the
natural extracts do not contribute to the colour enhancement of the
finished product due to the colour change based on the pH value for
the alkaline solution or the soap (neutral pH). For all that
reasons, the soap obtained is a quality product because it does not
have alkali, and because the glycerine content helps with
moisturizing and softening the skin. Keywords: soap; natural extracts; cold
saponification
Habilitation thesis summary: Advanced Capitalization of the Fly Ash to Obtain New
Materials
MARIA HARJA, "Gheorghe Asachi" Technical University
of Iaşi, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection,
mharja@ch.tuiasi.ro
Abstract
The habilitation thesis presents the original and relevant results
in the field of capitalization of fly ash, with application in
chemical engineering. In this thesis new synthesized low-cost
sorbents, based on Holboca ash, were comparative studied for the
removal of heavy metals from aqueous solutions. The synthesis method
was very simple under room temperature to high conditions and final
product can be safely disposed. The ashes are produced in power
plants and represent the largest source of energy. The production of
this material (the by-product) is estimated to be more than 370 Mt
last years. Ash can be modified and used as sorbent efficient for
the removal of heavy metals and dyes from solutions. The modified
ash has composition similar to natural zeolites. The ash and
modified ash present low cost and efficiently adsorbents, which can
be used for removal pollutants from water, gas and soil.
Research Regarding the Estimated Relationship Between Soil Salinity Indices
MARIA CĂTĂLINA PASTIA, "Gheorghe Asachi" Technical
University of Iaşi, Romania, Faculty of Hydrotechnical Engineering, Geodesy
and Environmental Engineering, mariapastia@yahoo.com FLORIAN STĂTESCU,
"Gheorghe Asachi" Technical University of Iaşi, Romania, Faculty of
Hydrotechnical Engineering, Geodesy and Environmental Engineering
VASILE LUCIAN PAVEL,
"Gheorghe Asachi" Technical University of Iaşi, Romania, Faculty of
Hydrotechnical Engineering, Geodesy and Environmental Engineering
LAURA
BULGARIU, "Gheorghe Asachi" Technical University of Iaşi, Romania,
Faculty of Chemical Engineering and Environmental Protection SABINA IOANA COJOCARU,
"Alexandru Ioan Cuza" University of Iaşi, Romania, Faculty of
Biology
Abstract Despite salinization is one of the most widespread soil
degradation processes and affects between 1 and 3 million hectares
in the European Union, the measurement of exchangeable cations
concentration of soil generates some problems related to the
intensity and duration of these laboratory tests for determination.
In these context it is desirable to determine relationships between
certain models of soil salinity indices. One of these indicators is
soil Exchangeable Sodium Percentage (ESP), which is determined using
laborious and time consuming laboratory tests. Therefore it may be
more appropriate and economical to develop a relationship which uses
a more simple soil salinity indicator. Therefore, the main objective
of this study is to propose a pattern ESP-SAR for salinized soils
from investigated perimeter of Osoi-Moreni, Iaşi County, Romania.
The research required the use of pairs of samples, which were
collected and processed as the indicated above, to compare ESP
values measured by laboratory tests with data from the application
of the linear regression equation SAR-ESP. The Bland-Altman method
(Bland and Altman, 1999) was used to compare the results from
laboratory tests with the results of SAR-ESP model. Statistical
analyzes were performed using Microsoft Excel (version 2010).
Keywords: Sodium absorption ratio; Exchangeable sodium percentage;
Soil.
Synthesis of 4’-Aminophenyl Benzimidazole
CORINA CERNĂTESCU, "Gheorghe Asachi" Technical University
of Iaşi, Romania, Faculty of Chemical Engineering and Environmental
Protection
MARIUS CĂTĂLIN CLOŞCĂ, "Gheorghe Asachi" Technical
University of Iaşi, Romania, Faculty of Chemical Engineering and
Environmental Protection
CLAUDIA COBZARU, "Gheorghe Asachi" Technical
University of Iaşi, Romania, Faculty of Chemical Engineering and
Environmental Protection,
ccobzaru@yahoo.com
Abstract In order to synthesize new azomethines derivate from p-
aminophenyl benzimidazole we tried to obtain the benzimidazole using
synthetic paths from scientific literature. Three different
synthetic methods have been used, the optimal method has been
selected and the obtained product was purified by different means in
order to establish the best solvent. The samples were analysed by
the means NMR spectrometry. Keywords: p-aminophenyl
benzimidazole; different synthetic methods; NMR spectra.
Adsorption of Crystal Violet Dye onto Modified Ash
MARIA HARJA, "Gheorghe Asachi" Technical University of Iaşi,
Romania, Faculty of Chemical Engineering and Environmental Protection
GABRIELA CIOBANU,
"Gheorghe Asachi" Technical University of Iaşi, Romania, Faculty of Chemical
Engineering and Environmental Protection
LIDIA FAVIER, "Ecole Nationale Supérieure de Chimie de
Rennes, CNRS, France
LAURA BULGARIU,
"Gheorghe Asachi" Technical University of Iaşi, Romania, Faculty of Chemical
Engineering and Environmental Protection
LĂCRĂMIOARA
RUSU, "Vasile Alecsandri" University of Bacău, Romania, Faculty of
Engineering, listrati@ub.ro
Abstract In the present study, the dye adsorption from aqueous
solution, using available resources such as crystal violet as model
colorant and ash/modified ash as low cost sorbent from a local power
plant. The adsorbent was prepared by the alkaline method and
investigated using scanning electron microscopy (SEM-EDX), X-ray
diffraction (XRD) and Brunauer- Emmett - Teller (BET) methods. The
adsorbent in this study had a specific surface area of 41 m2·g-1.
The influence of several experimental conditions (initial pH,
adsorbent dose, initial dye concentration, contact time) on dye
removal rate was determined via batch adsorption experiments. The
highest dye removal rate obtained was about 92% at pH = 10 and
ambient temperature. The results obtained in this study confirm the
potential of modified ash to be used as efficient adsorbent for the
removal of crystal violet dye from aqueous solution. Keywords:
modified waste ash; crystal violet dye; adsorption; factor
influence; removal rate.
Challenges of the New Sensors: Nucleobases Containing Materials
ELENA LUIZA EPURE, "Gheorghe Asachi" Technical University of Iaşi,
Romania, Faculty of Chemical Engineering and Environmental Protection,
lepure@tuiasi.ro
Abstract The miniaturizing is an important request nowadays.
Sophisticated nano-structures are obtained by top-down or bottom-up
approach, growing the number of application in various domains like
biology, medicine, environmental, information technologie. Due to
the simplicity and multiple H- bonding, the nucleobases are very
suitable molecules for programmed self- assembled structures.
Synthetic chemists encouraged by the vast potential of nucleobases
application are in continuum search to apply the recognitive
function of these complementary pairs in various domains like
self-healing, medical diagnosis, sensors, drug delivery, information
storage, purification etc. This review highlights some important
recent developments of the nucleobases applications. Keywords:
nucleobases; supramolecular; nanostructures; self-assembling.
Phenol and Colour Removal from Wastewater Using Two Coal-Based Adsorptive
Materials: Preliminary Laboratory Tests and Performances
CARMEN ZAHARIA, "Gheorghe Asachi" Technical University of Iaşi,
Romania, Faculty of Chemical Engineering and Environmental Protection,
czah@ch.tuiasi.ro
Abstract Some preliminary laboratory scale set-up results of
adsorption process performance using different types of coal, as
carbonaceous adsorbents, meaning powder activated charcoal (PAC), or
granular activated charcoal (GAC) and mezotrophic peat (MP), applied for
phenol and color removal from different high phenol-containing synthetic and
real wastewaters were summarized. The influence of high phenol concentration
in some adsorption processes applied for synthetic wastewaters (i.e.
10-3,000 mg/L phenol-containing solutions) and real wastewaters (i.e.
wastewaters produced in manufacturing of wood fibrous plates, in a furniture
processing plant, which was contained a known phenol concentration of 3,000
mg phenol/L) were studied in order to obtain a laboratory estimation of
highest performance in phenol removal and its discoloration. The highest
phenol removal efficiency, working with a dose of 50 g/L PAC, was of 99.875%
in the case of 100 mg/L phenol-containing solutions, 80.70% in the case of
278 mg/L phenol-containing solutions with 50 g/L GAC, and 60.42% in the case
of 2000 mg/L phenol-containing solutions with 50 mg/L MP. For the studied
real wastewater containing around 3,000 mg/L phenol, the highest removal was
of 73.46% for color with PAC, and 57.58% with MP, after 60 min (50.83% after
10 min), and of 95.19% phenol with PAC and 63.30% with MP, after 60 min.
These data were useful in preparation of future experiments, and also of
in-deep adsorption mechanism characterization for high phenol- containing
industrial effluents, its optimization and industrial applications of
adequate operating conditions. Keywords: adsorption; powder (PAC) and
granular (GAC) activated charcoal; mezotrophic peat (MP); phenol and color
removal; wastewater treatment.
Spectrophotometric Determination of Cu(II), Co(II) and Ni(II) Ions in Mono
and Multi-Component Systems
VLADISLAV FORNEA, "Gheorghe Asachi" Technical University of
Iaşi, Faculty of Chemical Engineering and Environmental Protection
ŞTEFAN TRUPINĂ, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection
ALEXANDRU VASILICĂ IOSUB, "Gheorghe Asachi"
Technical University of Iaşi, Faculty of Chemical Engineering and
Environmental Protection
LAURA
BULGARIU, "Gheorghe Asachi" Technical University of Iaşi,
Faculty of Chemical Engineering and Environmental Protection,
lbulg@ch.tuiasi.ro
Abstract The selective determination of Cu(II), Co(II) and Ni(II) ions
from aqueous solution was spectrophotmetrically investigated using rubeanic
acid as color reagent. The reaction between Cu(II), Co(II) and Ni(II) ions
with rubeanic acid occurs rapidly at pH 3.5 in case of Cu(II) ions and at pH
9.0 in case of Co(II) and Ni(II) ions (buffered solutions). The metal
complexes have absorption maximums at different wavelength (380 nm for
Cu(II), 480 nm for Co(II) and 590 nm for Ni(II), respectively) and this
characteristic underlies the possibility of their determination in
multi-components systems. This method allows the determination of these
metal ions in a relatively wide concentration range, with acceptable
detection limits. The interferences caused by each metal ion in the
determination of the other were evaluated on the basis of the selectivity
coefficients. The validation of Cu(II), Co(II) and Ni(II) determination
through this method was done by recovery tests of metal ions in tap water.
The obtained results shows that this spectrophotometric method can be
successfully used for the analysis of Cu(II), Co(II) and Ni(II) ions in
water samples, whether are in mono- or multi-components systems.
Keywords: metal ions; rubeanic acid; aqueous solution; spectrophotometric
method.
Determination of Mineral Acids Concentration from Mixtures by Condutometric
Titration
MONICA-MARIA ROMAN, "Gheorghe Asachi" Technical University
of Iaşi, Faculty of Chemical Engineering and Environmental Protection
IONELA CIURDEA, "Gheorghe Asachi" Technical University
of Iaşi, Faculty of Chemical Engineering and Environmental Protection
CRISTINA LAZAREV, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection
LAURA BULGARIU, "Gheorghe Asachi" Technical University
of Iaşi, Faculty of Chemical Engineering and Environmental Protection,
lbulg@ch.tuiasi.ro
Abstract In this study, a conductometric titration method is proposed for
the quantitative determination of two mineral acids (HCl and H3PO4), both
individually and from mixture. Conductometric titration assumes the
experimental measuring of electrical conductivity of the analyzed solution
as a function of added titrant volume, and depends by the concentration of
all ions present in this solution. A solution of AgNO3 (0.1 N) was used as
titrant. Both mineral acids react with AgNO3 and form low soluble compounds
(AgCl and Ag2HPO4), and these reactions are the basis of their determination
by conductometric titration. If, HCl can be analyzed in this way with high
accuracy, regardless of whether is in mixture or not, the determination
of H3PO4 acid is more difficult due to the high solubility of Ag2HPO4
precipitate. Thus, the neutralization of H3PO4 acid with NaOH (0.1 N)
solution before to start the conductometric measurements is necessary, for
that his quantitative determination to be possible. Therefore, the
conductometric titration with AgNO3 can be used for the determination of
HCl and H3PO4, both individually and from mixtures, but this is possible
only after neutralization of the mineral acids with a strong base solution.
Keywords: mineral acids; mixtures; condutometric titration; AgNO3
titrant; aqueous solution.
Analytical Methods for Analyzing Some Oils Used in Cosmetics
Abstract In this paper three different oils have been analysed:
sesame, olive and jasmine. For their analyses standard methods for oils and
fats described by American Oil Chemists Society (AOCS, 1993) and
pharmacopoeia assays (Brazilian pharmacopoeia, 2010), such: index of acid,
saponification, iodine, peroxides, determination of potential of hydrogen
(pH), and density. Those analyses are important because they indicate the
quality and authenticity of the oil. The results showed that the oil
extracted from sesame and olive has acceptable characteristics and is of
good quality. For all of those the saponification index, the acidity and
peroxidation value have been determined. Keywords: index of acid; index
of saponification; index of peroxide; olive; jasmine; sesame oils.
Third Generation Biotehanol Production
ALEXANDRA CRISTINA BLAGA, "Gheorghe Asachi" Technical
University of Iași, Faculty of Chemical Engineering and Environmental
Protection
LENUȚA KLOETZER, "Gheorghe Asachi" Technical
University of Iași, Faculty of Chemical Engineering and Environmental
Protection
ALEXANDRA TUCALIUC, "Gheorghe Asachi" Technical
University of Iași, Faculty of Chemical Engineering and Environmental
Protection
DAN
CAȘCAVAL, "Gheorghe Asachi" Technical University of Iași, Faculty
of Chemical Engineering and Environmental Protection,
dancasca@tuiasi.ro ANCA IRINA GALACTION, "Grigore T. Popa" University of
Medicine and Pharmacy, Iași, Faculty of Medical Bioengineering
Abstract The algal biomass offers great potential as a sustainable
feedstock which can be processed for the third generation bioethanol
production, due to its many advantages: rapid growth rate, the ability to
accumulate important amounts of carbohydrates, all the materials produced
are nontoxic and biodegradable. However, in order to produce high
concentrations of ethanol, it is necessary to convert all specific
carbohydrate components of microalgae: glucan, sulphated polysaccharides,
mannitol, alginate, agar, and carrageenan. This paper describes different
types of algae and presents the main steps for the technology employed in
the production of third generation bioethanol. Keywords: bioethanol;
continuous fermentation; microalgae; seaweed.
Graphene Obtained by Pyrolytic Decomposition in N2 Atmosphere
CĂTĂLINA NUȚESCU DUDUMAN, "Gheorghe Asachi" Technical
University of Iaşi, Department of Materials Science,
catalinanutescu@yahoo.com JOSÉ MARÍA GÓMEZ DE SALAZAR Y CASO DE LOS
COBOS, Complutense University of Madrid, Spain, Department of
Materials Science and Metallurgical Engineering
MARÍA ISABEL BARRENA PÉREZ, Complutense University of
Madrid, Spain, Department of Materials Science and Metallurgical Engineering
LAURA GARCIA SANCHEZ, Complutense University of
Madrid, Spain, Department of Materials Science and Metallurgical Engineering
CONSUELO GÓMEZ DE
CASTRO, Complutense University of Madrid, Spain, Department of
Materials Science and Metallurgical Engineering
Abstract Graphene, an allotrope of carbon, is study in the last years
because posed interesting chemical, optical and electrical properties. The
paper describes the graphene obtaining method by the pyrolytic
decomposition. As raw materials was used epoxy resin. The product of
pyrolytic decomposition of the epoxy resin was characterized using several
techniques: scanning electron microscopy (SEM), transmission electron
microscopy (TEM), X-Ray diffraction (XRD), Fourier Transform Infrared
Spectroscopy (FTIR). Experimental results indicate the nanostructure
stacking of multiple layers of graphene; at 500 nm we can observe lamellas
of graphene. On the base of the experimental data we can conclude that the
pyrolytic decomposition product is graphene. Keywords: Graphene, Epoxy
resin, Pyrolysis, Characterization.
Abstract of PhD Thesis:
Extraction,
Identification and Antioxidant Activity of the Phenolic Secondary
Metabolites Isolated from the Leaves, Stems and Fruits of Two Shrubs of the
Ericaceae Family
OANA-CRINA BUJOR, "Gheorghe Asachi" Technical University of
Iaşi, Faculty of Chemical Engineering and Environmental Protection,
oana_crin@yahoo.com
Biosorption of Zn(II) Ions from Aqueous Solution onto Mustard Waste Biomass
LĂCRĂMIOARA NEGRILĂ, "Gheorghe Asachi" Technical University
of Iaşi, Faculty of Chemical Engineering and Environmental Protection
DUMITRU BULGARIU, "Alexandru Ioan Cuza" University of
Iaşi, Faculty of Geography and Geology; Romanian Academy, Branch of Iaşi,
Collective of Geography
LAURA BULGARIU, "Gheorghe Asachi" Technical University
of Iaşi, Faculty of Chemical Engineering and Environmental Protection,
lbulg@ch.tuiasi.ro
Abstract In this study, the mustard waste biomass, obtained from
mustard seeds after oil extraction, was used as biosorbent for removal of
Zn(II) ions from aqueous solution. The experiments were performed in batch
systems at room temperature, and have follow the influence of initial
solution pH, biosorbent dose, initial Zn(II) concentration and contact time,
in order to establish the optimal experimental conditions. About 0.125 g of
mustard waste biomass was enough to remove 80% of 40.67 mg·L-1 Zn(II) ions
from 25 mL of aqueous solution in 60 min, at initial solution pH of 5.5,
considered to be optimal. The Langmuir and Freundlich isotherm models were
used for the mathematical modelling of the equilibrium isotherm, obtained
experimentally. The experimental data well fit with Langmuir model, and the
characteristic parameters of this model agree with the conditions of
favourable biosorption. The pseudo-first order and pseudo-second order
kinetic models were used for kinetic modelling of the experimental data. The
values of kinetics parameters calculated for both models have shown that
the pseudo-second order equation is more adequate. The experimental results
indicate that mustard waste biomass has a good biosorption capacity for
Zn(II) ions, and can be considered a potential biosorbent for the treatment
of industrial wastewaters. Keywords: Zn(II) ions; biosorption; mustard
waste biomass; aqueous solution.
Novel Furan Derivatives from
1-(4-Chlorophenyl)-3-(Furan-2-yl)prop-2-en-1-one Through Addition and Ring
Closure Reactions
GHEORGHE ROMAN, Petru Poni Institute of Macromolecular
Chemistry, Department of Inorganic Polymers,
gheorghe.roman@icmpp.ro
Abstract Starting from a furan-containing chalcone analogue, a series of
furan derivatives have been prepared. Addition of 4-chlorothiophenol to this
chalcone analogue afforded the corresponding β-arylmercapto ketone, which
has been subsequently reduced to the β-arylmercapto alcohol. The Stetter
reaction of chalcone analogue with benzaldehyde and
thiophene-2-carboxaldehyde gave two hitherto unknown butane-1,4-diones.
Hydrazine and phenylhydrazine converted the chalcone analogue into the
expected pyrazolines. Keywords: chalcone; thia-Michael addition; Stetter
reaction; pyrazoline.
Consumer Views on the Future Trend for Organic Food Production and
Acquisition in Conjunction with Environmental Conservation and Development.
Case Study: Sibiu
LEILA BARDAŞUC, Universidad Europea de Madrid (European
University of Madrid), Madrid, Spain,
leila.bardasuc@yahoo.com DELIA MONICA DOMNICA,
Alma Mater University of Sibiu, Sibiu, Romania
NICUŞOR MARCEL UDREA, Alma Mater University of Sibiu,
Sibiu, Romania
IOANA
TĂLMĂCEAN, Alma Mater University of Sibiu, Sibiu, Romania
Abstract From the literature found in this topic, in Romania, organic
farming has developed in recent years. In this paper, a study was conducted
online, a study which seeks to highlight consumer views on the future trend
for organic food production and acquisition, in conjunction with
environmental conservation and development, in the county of Sibiu. The aim
is to study whether organic food production will have an upward, constant or
downward trend, through the needs of consumers in Sibiu, and determine
consumer attitudes toward these types of products. The quantitative analysis
realized (survey method) may underlie the disclosure between the producers
and the consumer views on the production and purchase of organic food in
Sibiu County, with the purpose to increase the production of organic food in
the future. This future trend may be related to organic products, consumers’
health and a cleaner environment. Keywords: production; consumption;
ecological product; environment; opinions.
Perovskites: Methods for Obtaining and Structures
DANIEL IOAN DUPALĂU, "Gheorghe Asachi" Technical University
of Iaşi, Faculty of Chemical Engineering and Environmental Protection,
dupalau_daniel@yahoo.ro DANIEL SUTIMAN,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection
Abstract Perovskite structure is one of the simplest chemical formulas
existing in nature, ABX3, where A and B are metal cation and anion X,
usually oxygen. The perovskite formula is ABX3 and it belongs to the ternary
family of crystalline structures. Thanks to this remarkable structures are
plenty of possible combinations and partial or total replacements, which
gives us a very large number of compounds. In this work we review a series
of perovskites presenting their general synthetic methods and structure.
Keywords: Perovskite; structure; synthesis.
Optimization the Physical-Chemical Processes in the Treatment of Domestic
and Industrial Wastewaters
MARIANA MINCU, National Institute for Research and
Development in Environment Protection, Bucharest, Romania,
mincu_mariana@yahoo.com CRISTINA MIHAELA BĂLACEANU,
National Institute for Research and Development in Environment Protection,
Bucharest, Romania
ANDREEA IOANA DĂESCU, National Institute for Research
and Development in Environment Protection, Bucharest, Romania
Abstract Sometimes the domestic wastewaters and certain types of
industrial waters, inadequately treated, as well as runoff water from
fertilized agricultural lands reach in the surface waters. These are
important sources of nutrients which are responsible for the appearance of
eutrophication. The eutrophication is a major environmental problem that
affects surface waters across the world. Decreasing of the amount of
nutrients in surface waters is an increasing and topical problem for both
the European Union and Romania. Efficiency in wastewater treatment is very
important for reduction of the nutrient loading in surface water, which is
one of the European Union policies objectives (Water Framework Directive).
In order to prevent the nutrients to reach the quantity amounts that produce
eutrophication in surface waters, technologies for removal of nitrogen and
phosphorus were experienced during some research conducted by INCDPM-
Bucharest. Keywords: wastewater treatment; removal of nitrogen and
phosphorus; eutrophication.
Abstract of PhD Thesis: Study of Extraction
and Immobilization Posibility of Polyphenolic Compounds from Spruce Wood
Bark
ROXANA ELENA GHIȚESCU, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection,
ghitescu.roxana@yahoo.com