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