2020, Issue 66(70), Fasc. 3 (September)

Contents

pages 1- 8   Download

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

pages 9 - 21    Download
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

pages 23 - 36    Download
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

pages 37 - 48    Download
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

pages 49 - 57    Download
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

pages 59 - 66    Download
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.