JSCS Vol 72, No. 6

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J. Serb. Chem. Soc. 72 (6) 533–537 (2007)

UDC acidithiobacillus ferrooxidans+546.723–71+66.094.3+66.094.522.8, JSCS–3584, doi: 10.2298/JSC0706533B; Short communication

SHORT COMMUNICATION

Oxidation of dibenzothiophene as a model substrate for the removal of organic sulphur from fossil fuels by iron(III) ions generated from pyrite by Acidithiobacillus ferrooxidans

VLADIMIR P. BESKOSKI, VALERIJA F. MATIC, JELENA MILIC, DEJAN GODJEVAC, BORIS MANDIC* and MIROSLAV M. VRVIC*

Department of Chemistry ICTM, 11001 Belgrade, Njegoseva 12, P. O. Box 473, Serbia

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

(Received 4 August, revised 12 October 2006)

Within this paper a new idea for the removal of organically bonded sulphur from fossil fuels is discussed. Dibenzothiophene (DBT) was used as a model compound of organicmolecules containing sulphur. This form of (bio)desulphurization was performed by an indirect mechanism in which iron(III) ions generated from pyrite by Acidithiobacillus ferrooxidans performed the abiotic oxidation. The obtained reaction products, dibenzothiopene sulfoxide and dibenzothiophene sulfone, are more soluble in water than the basic substrate and the obtained results confirmed the basic hypothesis and give the posibility of continuing the experiments related to application of this (bio)desulphurization process.

Keywords: Acidithiobacillus ferrooxidans, iron(III) ion, DBT, oxidation, desulphurization.

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J. Serb. Chem. Soc. 72 (6) 539–544 (2007)

UDC 542.913+547.53.024+547.79:615.281, JSCS–3585 doi: 10.2298/JSC0706539B; Short communication

SHORT COMMUNICATION

A facile synthesis and the antimicrobial activity of some 4-aryltriazoles

SHIPRA BALUJA, SUMITRA CHANDA*, RAJESH CHABHADIYA*, NIKUNJ KACHHADIA, RATHISH NAIR* and ASIF SOLANKI

Department of Chemistry, Saurashtra University, Rajkot-360005, Gujarat, India

*Department of Bioscience, Saurashtra University, Rajkot-360005, Gujarat, India

(Received 3 May, revised 6 September 2006)

Some 4-aryltriazoles were synthesized and tested for their antibacterial effects against Bacillus cereus, Pseudomonas testosteroni, Klebsiella pneumoniae Micrococcus flavus, and Citrobacter freundii. The 4-aryltriazoles were obtained by cyclization of the potassium salt of the appropriately substituted dithiocarbazinic acid with aromatic AMines. The new synthesized compounds were characterized using infrared and ¹H nuclear magnetic resonance spectroscopy and further supported by mass spectrometry.

Keywords: 4-aryltriazoles, synthesis, antibacterial activity.

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J. Serb. Chem. Soc. 72 (6) 545–554 (2007)

UDC 547.288.1:548.73:536.5:537.213, JSCS–3586, 10.2298/JSC0706545B; Original scientific paper

Low temperature crystal structure, experimental atomic charges and electrostatic potential of AMmonium decavanadate hexahydrate (NH₄)V₁₀O₂₈·6H₂O

GORAN A. BOGDANOVIC NADA BOSNJAKOVIC–PAVLOVIC*, ANNE SPASOJEVIC–DE BIRE**, NOUR EDDINE GHERMANI**^,*** and UBAVKA MIOC*

VINCA Institute of Nuclear Sciences, Laboratory of Theoretical Physicics and Condensed Matters P. O. Box 522, 11001 Belgrade, Serbia

*Faculty of Physical Chemistry, University of Belgrade, P. O. Box 137, 11001 Belgrade, Serbia

**Laboratoire SPMS UMR CNRS 8580, Ecole Central Paris I, Grande Voie des Vignes, 92295 Châtenay-Malabry, France

***Laboratoire de Physique Pharmaceutique UMR CNRS 8612, Faculty de Pharmacie 5, Rue Jean-Baptiste Clément, 92296 Châtenay-Malabry cedex, France

(Received 6 September 2006)

The X-ray structure of AMmonium decavanadate hexahydrate was redetermined at a low temperature (100 K) in order to locate the hydrogen sites and to study the hydrogen bonds. The hydrogen atoms were assigned to the appropriate atomic group, NH₄⁺ cations, and water molecules, missing to the best of our knowledge in the literature. A kappa refinement was performed to estimate the experimental atomic charges. These charges were used to generale the electrostatic potential on the molecular surfaces of decavanadate polyanions isolated from the influence of the crystal lattice. Comparisons with previous theoretical (ab initio) calculations were made and are also discussed.

Keywords: polyoxometalate, decavanadate, X-ray structure, atomic charges, electrostatic potential.

Full Article - PDF 179 KB

J. Serb. Chem. Soc. 72 (6) 555–562 (2007)

UDC 66.081+546.719+661.183.8:620.181.5, JSCS–3587, 10.2298/JSC0706555L; Original scientific paper

Sorption of rhenium on alumina under dynAMic conditions

DRAGOLJUB M. LUKIC, JURIJ L. VUCINA and SLOBODAN K. MILONJIC*

Laboratory for Radioisotopes, Vinca Institute of Nuclear Sciences, 11001 Belgrade, P. O. Box 522, Serbia

*Chemical DynAMics Laboratory, Vinca Institute of Nuclear Sciences, 11001 Belgrade, P. O. Box 522, Serbia

(Received 6 July 2006)

The sorption of perrhenate anion on alumina from aqueous solutions of sodium chloride was investigated under dynAMic conditions. The initial concentrations of rhenium were in the range of 2.7´10^-2–2.7 mmol/dm3. The breakthrough curves as the function of Re and NaCl concentrations (0.12–0.20 mol/dm³), pH 2–6 and flow rate 3–10 ml/min were determined. According to the experimental results, it was concluded that the breakthrough capacities, the capacities at c/c₀ = 0.5, the total column capacities and the utilization degrees (column efficiency) increase with increasing Re and NaCl concentrations and decreasing pH. The optimal flow rate was found to be 3 ml/min. At pH 2 and c₀ = 2.7 mmol Re/dm³, the total capacity was found to be Q_0.9^max = 2.1´10-2 mmol Re/g Al₂O₃. The data for perrhenate anions fit with a Henry-type isotherm. It was found that, under the above mentioned conditions, the value of the Henry constant K_H was 7.8´10^-3 dm³/g and the Gibbs energy change, DG was –0.5 kJ/mol.

Keywords: rhenium, sorption, alumina, sorption capacity, sorption isotherm.

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J. Serb. Chem. Soc. 72 (6) 563–578 (2007)

UDC 546.76+546.226–325:548.7:544.6:620.193, JSCS–3588, doi: 10.2298/JSC0706563J; Original scientific paper

Structural effects of metallic chromium on its electrochemical behavior

BORE JEGDIC, DRAGUTIN M. DRAZIC*, JOVAN P. POPIC* and VELIMIR RADMILOVIC**

Institute for Chemical Power Sources, Batajnicki drum bb. 11070 Belgrade-Zemun, Serbia

*Institute of Chemistry, Technology and Metallurgy-Center for Electrochemistry, P. O. Box 473, 11001 Belgrade, Serbia

**Lawrence Berkley National Laboratories, University of California, Berkeley, CA, USA

(Received 20 February 2007)

Chromium dissolution in aqueous sulfuric acid solution of pH 1 was studied electrochemically on chromium electrodes with different crystallographic structures. A slow potentiodynAMic method was used for the electrochemical measurements in deaerated solutions (purgedwith nitrogen),while the Cr(III) ions in the solution after the corrosion were determined by atomic absorption spectrometry. Three electrode materials with a very dominant crystallite orientation resembling single crystal structures (i.e., 111 and 110) confirmed by the electron backscattering diffraction (EBSD), were used in the experiments. The (111) structures were somewhat more active electrochemically (both anodic and cathodic) than the (110) structure. However, Cr electrochemically deposited in standard plating bath, assumed from literature data to has also the (111) structure, was more than 4 times active for anodic dissolution and, by the sAMe number, less active for cathodic hydrogen evolution. The concentrations of Cr(III) ions determined in the solution after definite times of corrosion of all the materials showed almost two times larger dissolution rates than observed electrochemically by three different electrochemical methods (Wagner–Traud, Stern–Geary, electrochemical impedance spectroscopy). This is explained by the simultaneous occurrence of potential independent chemical dissolution of Cr, by a direct reaction of metallic Cr with H₂O molecules, proposed a long time ago by Kolotyrkin and coworkers.

Keywords: chromium, crystalline structure, electrochemistry, corrosion, sulfuric acid.

Full Article - PDF 262 KB

J. Serb. Chem. Soc. 72 (6) 579–583 (2007)

UDC 546.47+546.48:551.312.2:504.4.054(474.5), JSCS–3589, doi: 10.2298/JSC0706579T; Short communication

SHORT COMMUNICATION

Accumulation of sadmium and zinc in bottom sediments of different waters of Lithuania

STASYS TAUTKUS, LAURA STEPONENIENE and ROLANDAS KAZLAUSKAS

Department of Analytical and Environmental Chemistry, Vilnius University, Naugarduko 24, LT-03225 Vilnus, Lithuania

(Received 10 april, revised 30 November 2006)

Distribution of cadmium and zinc in the bottom sediments of different waters of Lithuania was investigated using flAMe atomic absorption spectrometry (FAAS). Two methodologies (liquid and heating mineralization) for the mineralization of the bottom sediments were employed and compared. The accuracy of the FAAS method was evaluated in comparison with a photometric method. The obtained results demonstrate that the suggested procedure could be successfully applied for the analysis of bottom sediments of different water comples with satisfactory accuracy.

Keywords: cadmium, zinc, bottom sediments, FAAS, mineralization.

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J. Serb. Chem. Soc. 72 (6) 585–590 (2007)

UDC 628.193:546.815+66.061:543.31+543.42, JSCS–3590, doi: 10.2298/JSC0706585T; Short communication

SHORT COMMUNICATION

Determination of lead in water resources by flAMe atomic absorption spectrometry after pre-concentration with AMmonium pyrrolidinedithiocarbAMate immobilized on surfactant-coated alumina

SAYED MORTEZA TALEBI and HOMEYRA SAFIGHOLI

Department of Chemistry, Isfahan University, Isfahan, Iran

(Received 8 May, revised 24 October 2006)

Arapid, simple, and sensitive procedure based on modified solid phase extraction was developed for the pre-concentration and determination of trace AMount of lead in water resources. Lead was reacted with AMmonium pyrrolidinedithiocarbAMate (APDC) to make a complex. The complex was then collected in a column packed with surfactant-coated alumina. The parAMeters affecting the collection efficiency and desorption rate of the lead complexes from the column were investigated and optimized. The collection efficiency of the lead complex on the adsorbent was excellent under the optimized conditions. The results obtained from the recovery test showed the capability and reliability of the method for the analysis of trace AMounts of lead. The proposed pre-concentration procedure made it possible to apply conventional flAMe atomic absorption spectrometry (FAAS) for the sensitive determination of trace AMounts of lead in water resources.

Keywords: flAMe atomic absorption spectrometry, determination of trace lead, water pollution, pre-concentration of lead, solid phase extraction.

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J. Serb. Chem. Soc. 72(6) 591–604 (2007)

UDC 666.942+666.952:666.9.017, JSCS– 3591, doi: 10.2298/JSC0706591S; Original scientific paper

Hydration study of mechanically activated mixtures of Portland cement and fly ash

GORDANA STEFANOVIC, LJUBICA COJBASIC, ZIVKO SEKULIC* and SRDJAN MATIJASEVIC*

Faculty of Mechanical Engineering, Aleksandra Medvedeva 14, 18000 Nis, Serba

*Institute for the Technology of Nuclear and other Raw Materials, Franche d'Epere 86, 11000 Beograd, Serbia

(Received 19 May, revised 19 September 2006)

Fly ash (FA) can be used in cement mixtures with certain limitations. The problem of the mentioned mixtures lies in the insufficient activity of the particles of FA in the reactions which are important for the establishment of the mechanical characteristics of cement. This is particularly true for the hydration reactions. As a result of this, cement pastes formed by mixing ash and clinker have worse characteristics compared to those of pure Portland cement (PC), especially in the early period of setting. As is well known, FA can be a good solution for the neutralization of the negative effects generated due to the creation of free Ca(OH)2 during the hydration of PC, provided that the problems with the low activity of FAare overcome. For the experiments in this study, a mixture of Portland cement and fly ash was used, the content of ash in the mixture being 30 % and 50 %. Mechanical activation was performed in a vibrating ring mill. The goal of this study was to demonstrate, through experimental results, that during the mechanical activation of a PC and FAmixture, the components in the mixture which mostly affect the direction, rate and range of hydration reactions occurring in the mixture had been activated. The values of the compressive strength of the activated and non-activated mixtures and the changes of their specific surface area proved that during the grinding process, the mixture PC+FA had been mechanically activated. The highest increase of compressive

strength was achieved in the early period of setting, which indicates an improvement in the early hydration of the mixture. XRD, DTA and TG analyses showed that the alite (C₃S) and belite (C₂S) from the PC and a part of the fly ash were activated.

Keywords: fly ash, mechanical activation, activity, cement.

Full Article - PDF 190 KB

J. Serb. Chem. Soc. 72(6) 605–614 (2007)

UDC 620.284–037.3+541.183:546.47'56'73'815:628.3, JSCS– 3592, doi: 10.2298/JSC0706605R; Original scientific paper

Removal of metal cations from wastewater using recycled wool-based non-woven material

MAJA RADETIC, DARINKA RADOJEVIC, VESNA ILIC, DRAGAN JOCIC, DRAGAN POVRENOVIC*, BRANISLAV POTKONJAK**, NEVENA PUAC*** and PETAR JOVANCIC

Textile Engineering Department, Faculty of Technology and Metallurgy, Karnegijeva 4, 11000 Belgrade, Serbia

*Department of Environmental Engineering, Faculty of Technology and Metallurgy, Karnegijeva 4, 11000 Belgrade, Serbia

**Department of Chemistry, Institute of Chemistry, Technology and Metallurgy, Njegoseva 12, 11000 Belgrade, Serbia

***Institute of Physics, Pregrevica 118, 11080 Zemun, Serbia

(Received 25 May 2006)

In this study, the effect of low-temperature air plasma, biopolymer chitosan and hydrogen peroxide treatment of recycled wool-based non-woven material on metal cation uptake was investigated. Recycled wool-based material either as an untreated or modified material showed ability to bind all investigated metal cations in the following order: Pb²⁺>Cu²⁺>Zn²⁺>Co²⁺. Material performed good selectivity due to distinct sorption rates of studied metal cations.

Keywords: recycled wool, adsorption, lead, copper, zinc, cobalt.

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J. Serb. Chem. Soc. 72 (6) 615–619 (2007)

UDC *Acidithiobacillus ferrooxidans +546.723–71+66.094.3+66.094.522.8, JSCS–3593, doi: 10.2298/JSC0706615J; Short communication

SHORT COMMUNICATION

Bacterially generated Fe₂(SO₄)₃ from pyrite, as a leaching agent for heavy metals from lignite ash

JELENA S. JEKIC, VLADIMIR P. BESKOSKI*, GORDANA GOJGIC-CVIJOVIC*, MIRJANA GRBAVCIC and MIROSLAV M. VRVIC**

Institute for Technology of Nuclear and Other Mineral Raw Materials, 11000 Belgrade, Franche d'Eperea 86, P. O. Box 390, Serbia

*Department of Chemistry ICTM, 11000 Belgrade, Njego{eva 12, P. O. Box 473, Serbia

**Faculty of Chemistry, University of Belgrade, 11001 Belgrade, Studentski trg 12–16, Serbia

(Received 7 November, revised 22 December 2006)

Investigations of heavy metals from lignite ash, which is a coal combustion by-product, have for years been very interesting from different aspects of environmental protection. In this study, the possibility of microbiological ash leaching, with a strong oxidation agent, bacterially generated Fe₂(SO₄)₃ was investigated in order to minimize the concentration of toxic ash elements. Leaching experiment by the shake flask testing technique was performed during a period of 20 d at a temperature of 28 °C. The results obtained show 5- to 22-fold (for Cd and Ni approx. 5, Zn approx. 6, Mn approx. 8, Cr approx. 13 and Cu approx. 22) higher metal leaching efficicency in the suspension with bacterially generated Fe₂(SO₄)₃ than in the control suspension.

Keywords: Acidithiobacillus ferrooxidans, heavy metals, coal ash.

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J. Serb. Chem. Soc. 72 (6) 621–628 (2007)

UDC 553.76:626.812:663.646:543.4/.5(497), JSCS–3594, doi: 10.2298/JSC0706621J; Original scientific paper

Natural radioactivity of some spring and bottled mineral waters from several central Balkan sites, as a way of their characterization

JASMINKA D. JOKSIC, MIRJANA B. RADENKOVIC and SCEPAN S. MILJANIC*

Vinca Institute of Nuclear Sciences, Radiation and Environmental Protection Laboratory, P. O. Box 522, 11001 Belgrade, Serbia

*University of Belgrade – Faculty of Physical Chemistry, P. O. Box 137, 11001 Belgrade, Serbia

(Received 14 May, revised 28 June 2006)

In this work, a study of the radioactive content of some spring and bottled mineral waters originating frommetAMorphic rock areas was carried out.Ahigh content of radium isotopes (²²⁶Ra, ²²⁸Ra), was found by radiometric analysis in the spring waters: Studenica (²²⁶Ra: 289 mBq/L), ^ibutkovica (²²⁶Ra: 92, 4 mBq/L, ²²⁸Ra: 610 mBq/L), and Crni Guber (²²⁶Ra: 120 mBq/L, ²²⁸Ra: 1170 mBq/L). On the other hand, the radiochemical results showed a higher concentration of ²³⁸U in the bottled mineral water sAMples (dissolved uranium concentrations were from 0.21 mBq/L, for "Kopaonik" to 71.5mBq/L fo "Skadarska") than in the spring water sAMples (dissolved uranium concentrations were very low » 10 mBq/L). The concentrations of all the present naturally occuring radionuclides: ²³⁸U, ²³⁴U, ²³²Th, ²³⁰Th, ²²⁸Th, ²²⁸Ra and ²²⁶Ra were determined by alpha/gAMma spectrometric analysis. The activity ratios ²³⁴U/²³⁸U, ²²⁶Ra/²³⁰Th and ²²⁸Th/²³²Th, ²²⁸Ra/²²⁸Th were calculated and are discussed as an indication of the radioactive disequilibrium in bothe the ²³⁸U and ²³²Th radioactive series. The high contents of radium isotopes with respect to the equilibrium values expected from the respective parents ²³²Th/(²³²Th series) and ²³⁰Th (²³⁸U series) found in the spring water sAMples is the main evidence for the existence of significant radioactive disequilibrium in both the radioactive series.

Keywords: radioactivity: spring waters, mineral bottled waters, spectometry analysis, radioactive equilibirum, activity rations.

Full Article - PDF 127 KB

J. Serb. Chem. Soc. 72 (6) 629–633 (2007)

UDC 628.4.038:633.13:541.183+544.354–128.4:549, JSCS–3595, doi: 10.2298/JSC0706629R; Short communication

SHORT COMMUNICATION

Effect of an industrial chemical waste on the uptake of cations by green oat

HORTENSIA RADULESCU, LIDIA TAUBERT*, SÁNDOR A. KISS**, ECATERINA PRINCZ* and ÉVA STEFANOVITS-BÁNYAI***

Banat's University of Agricultural Sciences and Veterinary Medicine Timisoara, Faculty of Agriculture, Calea Aradului 119, 300645-Timisoara, Romania

*Chemistry Institute Timisoara of the Romanian Academy, Inorganic Chemistry Department, Bd. M. Viteazu 24, 300223-Timisoara, P. O. Box 5/612, Romania

**Hungarian Magnesium Society, Fö fasor 73A/2, H - 6726 Szeged, Hungary

***Corvinus University, Faculty of Food Science, Villányi str., Budapest, Hungary

(Received 10 May, revised 8 September 2006)

Calcium carbonate, obtained as a waste in the industrial manufacture of magnesium carbonate and magnesium oxide from dolomites, can be applied in agriculture. The appreciable AMounts of calcium and magnesium in this waste, together with impurities such as iron, zinc, manganese, chromium and copper compounds can be useful in soil AMendment and plant nutrition. This paper presents preliminary results of the testing of several waste doses on soil, pursuing their effect on the uptake of cations by green oat (Avena sativa L.). The obtained results show an increase in the AMount of calcium, magnesium, zinc and copper found in green oat plants, as well as a decrease of the content of iron and manganese with increasing waste dose. These results may be explained by lower absorptions of iron andmanganese because of the antagonistic effect created by high AMounts of calcium and magnesium, as well as by the presence of copper and zinc.

Keywords: waste doses, content of mineral elements, cation uptake.

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