2016, Volume 62(66), Issue 3-4 (December)
Contents
pages 1- 8 Download
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
pages 9 - 19 Download
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
pages 21 - 31 Download
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
pages 33 - 51 Download
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
pages 53 - 58 Download
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
pages 59 - 70 Download
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
pages 71 - 72 Download