Vol 78, No 7 - Abstracts

JSCS Vol 78, No. 7

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Whole issue - PDF 4,213 KB

J. Serb. Chem. Soc. 78 (7) 909–916 (2013)

UDC 547.814.5+66.095.25:547.288.1+546.151; JSCS–4468; doi:10.2298/JSC120901119K Original scientific paper

Cyclization of 2′-hydroxychalcones to flavones using AMmonium iodide as an iodine source – an eco-friendly approach

PRAMOD S. KULKARNI, DASHARATH D. KONDHARE, RAVI VARALA* and PUDUKULATHAN K. ZUBAIDHA

School of Chemical Sciences, SwAMi RAManand Teerth Marathwada University, Nanded, Maharashtra – 431 606, India

Department of Chemistry, AP-IIIT Basar, Rajiv Gandhi University of Knowledge Technologies, Mudhole, Adilabad, Andhra Pradesh - 504 107, India

(Received 1 September, revised 30 October 2012)

Ammonium iodide on exposure to air decomposes to AMmonia and iodine. The in situ generated iodine was used for the cyclization of 2′-hydroxychalcones to the corresponding flavones under solvent-free conditions in good to excellent yields. This method could serve as an attractive alternative to the existing methods for synthesis of flavones and the use of toxic molecular iodine is avoided.

Keywords: flavones; 2′-hydroxychalcone; AMmonium iodide; solvent-free; in situ iodine.

Full Article - PDF 209 KB Available OnLine: 06. 11. 2012. Cited by

J. Serb. Chem. Soc. 78 (7) 917–920 (2013)

UDC 547.814.5+544.478+547.781/.783+542.913; JSCS–4469; doi: 10.2298/JSC120629157W Short communication

SHORT COMMUNICATION

An efficient and facile synthesis of flavanones catalyzed by N-methylimidazole

PENG WANG, JIABIN YANG, JIN CAI*, CHUNLONG SUN*, LUSHEN LI and MIN JI*

School of Biological Science &AMp; Medical Engineering, Southeast University, Nanjing 210096, China
School of Chemistry &AMp; Chemical Engineering, Southeast University, Nanjing 210096, China

(Received 29 June 2012)

The use of N-methylimidazole as an efficient catalyst for the cyclization of 2′-hydroxychalcones to the corresponding flavanones in DMSO was investigated. The scope of this process was studied and various flavanones were obtained exclusively in good yields.

Keywords: 2′-hydroxychalcones; flavanones; N-methylimidazole.

Full Article - PDF 179 KB Supplementary Material PDF 341 KB Available OnLine: 25. 12. 2012. Cited by

J. Serb. Chem. Soc. 78 (7) 921–931 (2013)

UDC 633.846+541.459:620.28:577.15:544.478–035.2; JSCS–4470; doi: 10.2298/JSC120930133K Original scientific paper

Magnetic labelled horseradish peroxidase–polymer nanoparticles: a recyclable nanobiocatalyst

AREZOO KHOSRAVI*, MANOUCHEHR VOSSOUGHI***, SAEED SHAHROKHIAN*,***and IRAN ALEMZADEH**

*Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran, Iran,

**Chemical and Petroleum Engineering Department, Sharif University of Technology, Tehran, Iran

***Department of Chemistry, Sharif University of Technology, Tehran, Iran

(Received 30 September, revised 26 November 2012)

In this study, the reusability and process stability of nano-reengineered horseradish peroxidase was investigated in a fluorescence-based sensing system for hydrogen peroxide determination as a model application. To this end, dendron macromolecules were attached to the enzyme surface through bio-conjugation techniques. The resulting enzyme–polymer nanoparticles, with an average size of 14(±2) nm, showed significant life time and thermal stability. For enzyme recovery and reusability purposes, the enzyme–polymer nanoparticles were labelled with magnetic nanoparticles with a labelling yield of 90 %. These labelled enzyme molecules showed significant process stability, i.e., up to 7 recycling period in a model sensing system. A linear calibration curve was obtained over a hydrogen peroxide concentrations range from 5×10-8 to 1×10-5 mol L-1, with a detection limit of 1.3×10-9 mol L-1 for the sensing system under the optimal conditions.

Keywords: horseradish peroxidase; nano-reengineered enzyme; magnetic nanoparticles; recyclable biocatalyst.

Full Article - PDF 741 KB Available OnLine: 05. 12. 2012. Cited by

J. Serb. Chem. Soc. 78 (7) 933–945 (2013)

UDC 663.551.5:634.22:546.56’47’72’41’23+543.421(497.11); JSCS–4471; doi: 10.2298/JSC121106016B Original scientific paper

The contents of heavy metals in Serbian old plum brandies

MIRJANA BONIĆ, VELE TEŠEVIĆ*, NINOSLAV NIKIĆEVIĆ**, JELENA CVEJIĆ***, SLOBODAN MILOSAVLJEVIĆ*, VLATKA VAJS****, BORIS MANDIĆ*, IVAN UROŠEVIĆ**, MILOVAN VELIČKOVIĆ** and SAŠA JOVANIĆ

Institute of Public Health, Zmaj Jovina 30, 24000 Subotica, Serbia

*Faculty of Chemistry, University of Belgrade, Studentski trg 16, 11000 Belgrade, Serbia

**Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11080 Zemun, Serbia

***Faculty of Medicine, University of Novi Sad, Hajduk Veljkova 3, 21000 Novi Sad, Serbia

****Institute for Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia

(Received 5 November 2012, revised 5 February 2013)

Seven elements, nAMely, arsenic, lead, cadmium, copper, zinc, iron and manganese were determined in 31 sAMples of Serbian plum brandies by application of atomic spectrometry techniques. FlAMe atomic absorption spectrometry was used for the quantification of copper, iron, zinc, manganese, lead and cadmium, and hydride generation atomic spectrometry absorption for arsenic quantification. The measured concentrations of the heavy metals and arsenic were assessed according to Serbian regulations, official regulations of some other countries and in respect to the content of microelements in other similar distilled alcoholic beverages. The AMounts of microelements in the maximal recommended daily and weekly intake of plum brandy were determined. The influence of production (home made or industrial), type of wooden barrel (oak or mulberry), and duration of ageing process on the content of Zn, Cu, Fe and Mn in plum brandies, as well as the coefficient of correlation between the Cu content and pH value were also studied.

Keywords: Šljivovica; plum brandy; atomic absorption spectrometry; aging parAMeters.

Full Article - PDF 265 KB Available OnLine: 13. 02. 2013. Cited by

J. Serb. Chem. Soc. 78 (7) 947–957 (2013)

UDC 542.9+547.57+547.551+546.732’742’562+543.429.22:615.28–188; JSCS–4472; doi: 10.2298/JSC120613121A; Original scientific paper

New complexes of Co(II), Ni(II) and Cu(II) with the Schiff base 2,2¢-[(3,3¢-dimethyl[1,1¢-biphenyl]-4,4¢-diylbis(nitrilomethylidyne)]bis[6-methoxyphenol]

IONELA ALAN, ANGELA KRIZA, OLGUTA DRACEA* and NICOLAE STANICA**

1 University of Bucharest, Faculty of Chemistry, Inorganic Chemistry Department, 23 Dumbrava Rosie Street, 020462 Bucharest, Romania

*“Cantacuzino” National Institute for Research in Microbiology and Immunology, 103 Spl. Independentei, 050096 Bucharest, Romania

**Ilie Murgulescu Institute of Physical Chemistry, Romanian Academy, 202 Spl. Independentei, 77208 Bucharest, Romania

(Received 13 June, revised 3 November 2012)

The new 2,2¢-[(3,3¢-dimethyl[1,1¢-biphenyl]-4,4¢-diylbis(nitrilomethylidyne)]bis[6-methoxyphenol] (H2L) Schiff base and its complexes with Co(II), Ni(II) and Cu(II) of the type [M(HL)Cl(H2O)] (M = Co(II) or Cu(II)), [M2L(H2O)4]X2 (M = Co(II), X = ClO4 and M = Cu(II), X = NO3) and [M2L(CH3COO)2] (M=Co(II), Ni(II), Cu(II)) were synthesised. The ligand and complexes were characterized by elemental analysis, conductivity measurements, magnetic moments at room temperature, IR, NMR, UV–Vis-NIR, EPR spectra and thermogravimetric analysis. Mole ratios of 1:1 or 1:2 between the ligand and metal were determined from the elemental analysis results. Except for the perchlorate complex that behaved as an electrolyte, the other complexes are non-electrolytes. The spectral data suggested tetrahedral, pseudo-tetrahedral or square-planar stereochemistry, which was confirmed by the magnetic behaviour of complexes. The antimicrobial tests indicated fungicide effects for both the ligand and the complexes.

Keywords: Schiff base; o-tolidine; o-vanillin; EPR spectra; antimicrobial activity.

Full Article - PDF 624 KB Supplementary Material PDF 341 KB Available OnLine: 05.11. 2012. Cited by

J. Serb. Chem. Soc. 78 (7) 959–971 (2013)

UDC 544.275–128+546.264.31:66.081+001.891; JSCS–4473; doi: 10.2298/JSC121018120Y; Original scientific paper

Investigations of CO₂ capture by 1-(3-AMinopropyl)-3-ethyl imidazolium tetrafluoroborate ionic liquid

LIJUAN YANG, YI ZHAO and WEI SUN*

North China Electric Power University, College of Environmental Science and Engineering, Baoding 071003, China

*North China Electric Power University, Department of Power Engineering, Baoding 071003, China

(Received 18 October 2012)

CO2 capture by 1-(3-AMinopropyl)-3-ethylimidazolium ([Apeim]+) tetrafluoroborate ([BF4]-) ionic liquid (IL) was systematically explored at the B3LYP/6-311++G^¬¬ and mp2/6-311++G^¬¬ levels. The stable geometries of the ILs and the capture products were optimized, the energies of these geometries were obtained and corrected by zero-point-vibration-energy and basis set superposition error correction. The results show that the interactions between [Apeim]+ and [BF4]- are mainly displayed as hydrogen bonds, but the interaction energies exceed –328 kJ mol-1. Further analysis found that the interactions are reinforced by charge dispersion and charge redistribution of the ion-pair, and that electrostatic attraction contributes a great deal to the interaction energies. This IL system capturing CO2 belongs to the class of physical absorption with a 1:1 molar absorption ratio; the absorption energy is nearly –18 kJ mol-1 and thus, this IL may require low energy consumption when regenerated from IL–CO2.

Keywords: ionic liquid; CO2 capture; absorption; charge redistribution.

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J. Serb. Chem. Soc. 78 (7) 973–986 (2013)

UDC 544.2+544.15:544.174.21.3+544.354–128; JSCS–4474; doi: 10.2298/JSC121115128S; Original scientific paper

Ab initio study of vibronic transitions between X²Π and 1²Σ⁺ electronic states of HCP⁺

LJILJANA STOJANOVIĆ

Faculty of Physical Chemistry, Studentski Trg 12, 11158 Belgrade, Serbia

(Received 15 November, revised 25 November 2012)

The ground and low-lying excited doublet electronic states of the HCP+ were studied by means of the multireference configuration interaction method. The vibronic energy levels of the X2Π state of Σ, Π, Δ, and Φ symmetry, up to the 2500 cm-1, have been calculated variationally, employing previously developed ab initio methods that take into account vibronic and spin–orbit interactions. The vibronic wave functions were used to estimate transition moments between vibronic energy levels of the X2Π and 12Σ+ electronic states. The results were compared to available experimental and theoretical data.

Keywords: excited states; Renner–Teller effect; phosphaethyne cation.

Full Article - PDF 286 KB Available OnLine: 25. 11. 2012. Cited by

J. Serb. Chem. Soc. 78 (7) 987–995 (2013)

UDC 546.831–31:53.085.2+543.57; JSCS–4475; doi: 10.2298/JSC121010149S; Original scientific paper

The influence of chemical and thermal treatment on the point of zero charge of hydrous zirconium oxide

JOVAN B. STANKOVIĆ, SLOBODAN K. MILONJIĆ* and SLAVICA P. ZEC*

High Medical School, Cara Dušana 254, Belgrade, Serbia

*The Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia

(Received 10 October, revised 16 December 2012)

Two zirconia sAMples were prepared by precipitation from aqueous zirconium oxychloride and zirconyl sulfate solutions with potassium hydroxide. The prepared zirconia sAMples were AMorphous. The pHpzc values of the zirconia sAMples, determined in NaCl and NaNO3 solutions, were 6.6±0.1 and 6.9±0.1, respectively. After prolonged hydration of zirconia in doubly distilled water, the pHpzc decreased to 4.7±0.3. Crystallization into tetragonal (metastable) + monoclinic zirconia appeared at 691 K. Above 873 K, the tetragonal metastable phase changes to a monoclinic phase. It was shown that crystallite sizes of zirconia treated at 673–1273 K increased from 9.5 to 40.5 nm, respectively. The increase in temperature from 385 to 1070 K increased the pHpzc of zirconia sAMples from 6.6 to 9.0, respectively.

Keywords: zirconium oxide; point of zero charge; thermal analysis; surface properties.

Full Article - PDF 222 KB Available OnLine: 16. 12. 2012. Cited by

J. Serb. Chem. Soc. 78 (7) 997–1011 (2013)

UDC 546.655+546.62–034:621.793: 620.193+543.552; JSCS–4476; doi:10.2298/JSC121212009J; Original scientific paper

Electrochemical methods for corrosion testing of Ce-based coatings prepared on AA6060 alloy by the dip immersion method

BORE V. JEGDIĆ, LJILJANA S. ŽIVKOVIĆ*, JOVAN P. POPIĆ**, JELENA B. BAJAT*** and VESNA B. MIŠKOVIĆ-STANKOVIĆ***

Institute Goša, Milana Rakića 35, Belgrade, Serbia

*The Vinča Institute of Nuclear Sciences, University of Belgrade, P. O. BOX 522, 11001 Belgrade, Serbia

**ICTM-Department of Electrochemistry, University of Belgrade, Njegoševa 12, Belgrade, Serbia

***Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, P. O. Box 3503, 11120 Belgrade, Serbia

(Received 12 December 2012, revised 17 January 2013)

Dip-immersion is a simple and cost-effective method for the preparation of Ce-based conversion coatings (CeCCs), a promising alternative to toxic chromate coatings, on metal substrates. In this work, CeCCs were prepared on Al-alloy AA6060 from an aqueous solution of cerium chloride at room temperature. The effect of immersion time and post-treatment in phosphate solution on the microstructure and corrosion properties of the coatings was studied. The longer the immersion time was, the thicker but more non-homogeneous and cracked were the CeCCs. The post-treatment contributed to a sealing of the cracks, as proven by an increase in the corrosion resistance compared with the as-deposited coatings. The CeCCs prepared at longer deposition times and post-treated showed much better corrosion protection than those prepared at shorter deposition times. A detailed electrochemical impedance spectroscopy (EIS) study was undertaken to follow the evolution of the corrosion behaviour of the CeCCs with time of exposure to an aggressive chloride environment (3.5 % NaCl). For the sake of comparison, the EIS properties of bare AA6060 were also investigated. Linear voltAMmetry was performed to complete the study. The results confirmed the formation of protective CeCCs on the surface of AA6060. However, even CeCCs prepared at longer deposition times and post-treated provided short term protection in the aggressive environment, due to the small thickness of the coating.

Keywords: cerium; conversion coatings; aluminium alloy; EIS; linear voltAMmetry.

Full Article - PDF 571 KB Available OnLine: 28. 01. 2013. Cited by

J. Serb. Chem. Soc. 78 (7) 1013–1022 (2013)

UDC 628.3:546.47’74/.76’56’815:66.061:628.336:546.264–31; JSCS–4477; doi: 10.2298/JSC120321123Y; Original scientific paper

Subcritical and supercritical fluid extraction of heavy metals from sand and sewage sludge

ERDAL YABALAK and AHMET MURAT GIZIR

Department of Chemistry, Faculty of Arts and Science, Mersin University, Mersin TR-33343, Turkey

(Received 21 March, revised 15 September 2012)

Demetalization of Pb, Ni, Zn, Cu and Cr heavy metal ions from sea sand and real sAMples of sewage sludge by subcritical water and supercritical carbon dioxide was investigated. Experimental parAMeters such as temperature, pressure, extraction time in the static and dynAMic mode and sAMpling were optimized in order to determine the suitable conditions for high removal of metals. The best extraction efficiencies were obtained using acetyl acetonate as a chelating agent in both subcritical water and supercritical CO2 extractions for real and artificial sAMples. SAMples collected from extraction system using both subcritical water and supercritical carbon dioxide were analyzed by inductively coupled plasma mass spectrometry (ICP-MS). The highest recoveries obtained from real sAMples for Cr, Cu, Ni, Pb and Zn were 77.25, 95.1, 84.82, 94.92 and 98.39 %, respectively, using the chelating agent in the subcritical water extraction.

Keywords: subcritical water; supercritical carbon dioxide; demetalization; heavy metal extraction; sewage sludge; sea sand.

Full Article - PDF 229 KB Available OnLine: 09. 11. 2012. Cited by

J. Serb. Chem. Soc. 78 (7) 1023–1034 (2013)

UDC 66.095.13:547.587.52+547.261:547.269.3+547.533+544.973; JSCS–4478; doi: 10.2298/JSC120802101W; Original scientific paper

A study of the esterification of caffeic acid with methanol using p-toluenesulfonic acid as a catalyst

JUN WANG*, SHUANGSHUANG GU*, NA PANG*, FANGQIN WANG* and FUAN WU*^,**

*School of Biology and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212018, P. R. China

**Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang 212018, P. R. China

(Received 2 August, revised 24 September 2012)

Caffeic acid (CA) could be considered as an important natural antioxidant. However, the low solubility and stability of CA in various solvent systems is a major limiting factor governing its overall application in the lipid industry. However, the synthesis of methyl caffeate (MC) using CA and methanol is a feasible way to improve its lipophilicity. Herein, the reaction conditions and kinetic parAMeters for the synthesis of MC using p-toluenesulfonic acid (PTSA) as a catalyst were investigated, and the product was confirmed by liquid chromatography–mass spectrometry (LC–MS), Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopy, and melting point analysis. The highest yield of MC catalyzed by PTSA attained 84.0 % under the optimum conditions as follows: molar ratio of methanol to CA of 20:1, reaction temperature of 65 °C, mass ratio of catalyst to substrate of 8 %, and a reaction time of 4 h. The esterification kinetics of CA and methanol is described by the pseudo-homogeneous second order reversible model. The relationship between temperature and the forward rate constant gives the activation energy of 17.5 kJ mol-1. These results indicated that PTSA possesses high catalytic activity in the synthesis of MC, which is an efficient catalyst suitable for MC production in the chemical industry.

Keywords: caffeic acid; catalysis; esterification; kinetics; methyl caffeate; p-toluenesulfonic acid.

Full Article - PDF 744 KB Available OnLine: 24. 09. 2012. Cited by

J. Serb. Chem. Soc. 78 (7) 1035–1043 (2013)

UDC 547.21+542.92:504.53.054+665.73/.75; JSCS–4479; doi: 10.2298/JSC120829106A; Original scientific paper

Degradability of n-alkanes during ex situ natural bioremediation of soil contAMinated by heavy residual fuel oil (mazut)

MUFTAH MOHAMED ALI RAMADAN*, TATJANA ŠOLEVIĆ KNUDSEN**, MALIŠA ANTIĆ***, VLADIMIR P. BEŠKOSKI*,**, MIROSLAV M. VRVIĆ*,**, JAN SCHWARZBAUER**** and BRANIMIR JOVANČIĆEVIĆ*,**

*Faculty of Chemistry, University of Belgrade, Studentski trg 12–16, P. O. Box 158, 11001 Belgrade, Serbia

**Center of Chemistry, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11001 Belgrade, Serbia

***Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11081 Belgrade, Serbia

****Institute of Geology and Geochemistry of Petroleum and Coal, Lochnerstrasse 4–20, 52056 Aachen, Germany

(Received 29 August, revised 09 October 2012)

It is well known that during biodegradation of oil under natural geological conditions, or oil pollutants in the environment, degradation of hydrocarbons occurs according to a well-defined sequence. For exAMple, the major changes during the degradation process of n-alkanes occur in the second, slight and third, moderate level (on the biodegradation scale from 1 to 10). According to previous research, in the fourth, heavy level, when intensive changes of phenanthrene and its methyl isomers begin, n-alkanes have already been completely removed. In this paper, the ex situ natural bioremediation (non-stimulated bioremediation, without addition of biomass, nutrient substances and biosurfactant) of soil contAMinated with heavy residual fuel oil (mazut) was conducted during a period of 6 months. Low abundance ofn-alkanes in the fraction of total saturated hydrocarbons in the initial sAMple (identification was possible only after concentration by the urea adduction technique) showed that the investigated oil pollutant was at the boundary between the third and the fourth biodegradation level. During the experiment, an intense degradation of phenanthrene and its methyl-, dimethyl- and trimethyl-isomers was not accompanied by the removal of the remaining n-alkanes. The abundance of n-alkanes remained at the initial low level, even at end of the experiment when the pollutant reached one of the highest biodegradation levels. These results showed that the non-stimulated biodegradation of some hydrocarbons, despite their high biodegradability, had not proceeded completely to the end, even at final degradation stages. Under the condition of reduced availability of some hydrocarbons, microorganisms tend to opt for the less biodegradable but more accessible hydrocarbons.

Keywords: ex situ bioremediation; soil; heavy residual fuel oil; n-alkanes; degradability.

Full Article - PDF 213 KB Available OnLine: 09. 10. 2012. Cited by

J. Serb. Chem. Soc. 78 (7) 1045–1053 (2013)

UDC 504.53:504.06+581.5+635.01:546.3; JSCS–4480; doi: 10.2298/JSC120915116O; Original scientific paper

Impact of urban gardening in an equatorial zone on the soil and metal transfer to vegetables

JEAN AUBIN ONDO*^,**, PASCALE PRUDENT*, CATHERINE MASSIANI*, RICHARD MENYE BIYOGO**, MARIANE DOMEIZEL*, JACQUES RABIER*** and FRANÇOIS EBA**

*Aix-Marseille Université, CNRS, LCE, FRE 3416, 13331 Marseille, France,

**Ecole Normale Supérieure, Laboratoire Pluridisciplinaire des Sciences, B.P. 17009 Libreville, Gabon

***Equipe BBE, UMR-CNRS/IRD 6116 IMEP, Aix-Marseille université, case 97, 3, place Victor-Hugo, 13331 Marseille cedex 03, France

(Received 15 September 2012)

This study was aimed at assessing the impact of urban agriculture on physicochemical properties of the soil and the metal uptake by some leafy vegetables cultivated in urban soils of Libreville, Gabon. Cultivated and uncultivated topsoil and vegetable sAMples were collected from two urban garden sites, and analyzed. The results showed that there was strong acidification and a decrease in the concentrations of nutrients and metals in soils due of agricultural practices. The metal transfer to plants was important, with the exception of iron. The non-essential metals cadmium and lead were not detectable in the plant tissues. Amaranth accumulated more metals than other vegetables. Amaranth and Roselle were vegetables that preferentially concentrated metals in their leaves and could, therefore, be used for metal supplementation in the food chain.

Keywords: soil acidification; trace metals; leafy vegetables; bioconcentration factor; translocation factor.

Full Article - PDF 181 KB Available OnLine: 02. 11. 2012. Cited by

J. Serb. Chem. Soc. 78 (7) 1055–1077 (2013)

UDC 661.183.6+54–145.2+544.723+544.4:632.95; JSCS–4481; doi: 10.2298/JSC120530146S; Original scientific paper

Extractive efficacy for acephate of microwave synthesized zeolitic materials: equilibrium and kinetics

BHAVNA A. SHAH, AJAY V. SHAH* and PIYUSH Y. JADAV

1Department of Chemistry, Veer Narmad South Gujarat University, Surat-395007, Gujarat, India

**Science and Humanity Department, Polytechnic, Vidyabharti trust, Umrakh, Bardoli-394345, Gujarat, India

(Received 30 May, revised 23 November 2012)

The present investigation deals with the utilization of Bagasse fly ash (BFA), a sugar industry waste, and a zeolitic material (MZBFA) synthesized from BFA by a combined conventional and microwave reflux method as adsorbents for the extraction of acephate (ACP), an organophosphorus pesticide, from aqueous solution. The synthesized adsorbents were characterized using various techniques, such as Fourier-transform infrared (FTIR) spectroscopy, powder X-ray diffraction (PXRD) analysis and scanning electron microscopy (SEM). The effects of various experimental parAMeters were investigated using a batch adsorption technique for the extraction of ACP. The extent of removal increased with decreasing initial ACP concentration and particle size of the adsorbent. The adsorption was fast and equilibrium was established within 90 min. Pseudo-first-order, pseudo-second-order, BanghAM and intra-particle diffusion models were used to fit the experimental data. The pseudo-second-order rate equation was able to provide a realistic description of the adsorption kinetics. Equilibrium isotherms were analyzed by the Freundlich, Langmuir, Dubinin–Radushkevich and Tempkin isotherm Equations. The Langmuir Equation was found to represent the equilibrium data the best. A thermodynAMic study showed that the adsorption of ACP on MZBFA was higher than that on BFA. The results indicate that such Zeolitic materials could be employed as low cost alternatives to BFA in wastewater treatment for the removal of pesticides.

Keywords: ACP; adsorption; isotherm; kinetics; zeolite.

Full Article - PDF 960 KB Available OnLine: 12. 12. 2012. Cited by

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