Personal Research Database

Full Text: 2009\J Haz Mat168, 364.pdf

Abstract: This paper reports NiO as a novel and an efficient adsorbent for the removal of Pb from aqueous solutions. In the present investigation. Pb adsorption experiments on NiO were conducted on aqueous solution at different initial Pb concentration, pH of the solution and adsorption temperature. The mechanism of adsorption was observed to be an ion exchange between the surface proton and Pb in aqueous solution. Experimental data were best described by the Langmuir isotherms. The surface structure of the NiO before and after adsorption of Pb was analyzed by using FTIR spectroscopy, scanning electron microscopy (SEM) coupled with energy dispersive X-ray analyses (EDX). (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Adsorption, Adsorption, Aqueous, Cadmium, Cation Exchange, Chromium, Copper, Elsevier, FTIR, FTIR Spectroscopy, Goethite, Hydroxyapatite, Ion Exchange, Iron-Oxide, Isotherms, Kinetics, Langmuir Isotherms, Lead, Mechanism, Metal Ions, NiO, Pb, pH, Removal, Sem, Single-Metal, Solutions, Sorption, Spectroscopy, Temperature

? Gok, C. and Aytas, S. (2009), Biosorption of uranium(VI) from aqueous solution using calcium alginate beads. Journal of Hazardous Materials, 168 (1), 369-375.

Full Text: 2009\J Haz Mat168, 369.pdf

Abstract: In this paper, sorption potentials of uranium ions were studied using alginate polymer beads in diluted aqueous solutions. The ability of alginate beads to adsorb uranium(VI) from aqueous solution has been studied at different optimized conditions of pH, U(VI) concentration, contact time, biomass dosage and temperature. In order to determine the adsorption characteristics, Langmuir, Freundlich, and Dubinin-Radushkevich adsorption isotherms were applied to the adsorption data. The thermodynamic parameters such as variations of enthalpy Delta H, entropy Delta S and variation of Gibbs free energy Delta G were calculated from the slope and intercept of In K-d vs. 1/T plots. The results suggested that alginate beads could be suitable as a sorbent material for adsorption and removal of uranium ions from dilute aqueous solutions. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Acid, Adsorption, Adsorption, Adsorption Isotherms, Algae, Alginate, Aqueous, Behavior, Biomass, Biosorption, Ca-Alginate Beads, Cobalt, Elsevier, Freundlich, Heavy-Metal Biosorption, Isotherms, Natural Bentonite, pH, Polymer, Removal, Solutions, Sorption, Temperature, Thermodynamic, Thermodynamic Parameters, Uranium

? Vimala, R. and Das, N. (2009), Biosorption of cadmium(II) and Lead(II) from aqueous solutions using mushrooms: A comparative study. Journal of Hazardous Materials, 168 (1), 376-382.

Full Text: 2009\J Haz Mat168, 376.pdf

Abstract: Sorption capacity of oyster mushroom (Pleurotus platypus), button mushroom (Agaricus bisporus) and milky mushroom (Calocybe indica) were evaluated on biosorption of heavy metals, viz. cadmium(II) and Lead(II) from aqueous solutions. The optimum sorption conditions were studied for each metal separately. The desired pH of the aqueous solution was round to be 6.0 for the removal of cadmium(II) and 5.0 for removal of Lead(II) for all the mushrooms. The percent removal of both the metals was found to increase with the increase in biosorbent dosage and contact time. The fitness of the biosorption data for Langmuir and Freundlich adsorption models was investigated. It was found that biosorption of cadmium(II) and Lead(II) ions onto the biomass of the three mushrooms were better suitable to Langmuir than Freundlich adsorption model. P. platypus showed the highest metal uptake potential for cadmium (qmax 34.96 mg/g) whereas A. bisporus exhibited maximum potential for lead (q(max) 33.78 mg/g). Milky mushroom showed the lowest metal uptake capacity for both the metals. The present data confirms that mushrooms may be used as efficient biosorbent for the removal of cadmium(II) and Lead(II) ions from aqueous solution. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Adsorption, Aqueous, Arrhizus, Biomass, Biosorbent, Biosorption, Biosorption of Heavy Metals, Cadmium, Cadmium(II), Capacity, Chromium, Elsevier, Equilibrium, Freundlich, Heavy Metals, Heavy-Metal, Lead, Lead(II), Metal, Metals, Models, Mushrooms, pH, Recovery, Removal, Saccharomyces-Cerevisiae, Solutions, Sorption, Sorption Capacity, Waste-Water, Wastewaters

? Saeed, A., Iqbal, M. and Zafar, S.I. (2009), Immobilization of Trichoderma viride for enhanced methylene blue biosorption: Batch and column studies. Journal of Hazardous Materials, 168 (1), 406-415.

Full Text: 2009\J Haz Mat168, 406.pdf

Abstract: An efficient dye biosorbent was developed by entrapping a fungus mold, Trichoderma viride, within loofa sponge (LS) matirx. Immobilization enhanced the sorption of dye by 30% at equilibrium as compared with T viride free biomass (TVFB). The maximum dye biosorption capacity of T viride immobilized onto loofa sponge (TVILS) and TVFB was found to be 201.52 and 155.06 mg g^-1 biomass, respectively. The kinetics of dye removal by TVILS was rapid, with 84.3% sorption within the first 30 min and equilibrium after 90 min, whereas sorption by TVFB was slower as 61.4% dye was removed in first 30 min and equilibrium was achieved in 120 min. Biosorption kinetics and equilibria followed the pseudo-second-order and Langmuir adsorption models. FTIR spectroscopy of T viride biomass showed that amine, hydroxyl, carbonyl and amide bonds were involved in the sorption of dye. Dye desorption from dye-laden TVILS with 0.1 M HCl was 99%. Regenerated TVILS was reusable without any appreciable decrease in its biosorption capacity during five repeated cycles. The dye removing capacity of TVILS in a continuous-flow column bioreactor was better than in batch-scale procedures. The study shows that TVILS has the potential of application as an efficient biosorbent for the removal of methylene blue from aqueous solutions. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Adsorption, Application, Aqueous Solutions, Aqueous-Solution, Azo-Dye, Basic Dye, Batch and Column Studies, Biomass, Bioreactor, Biosorbent, Biosorption, Biosorption Kinetics, Capacity, Cell Immobilization, Column, Column Studies, Corynebacterium-Glutamicum, Desorption, Dye, Dye Biosorption, Dye Removal, Dye Sorption, Equilibria, Equilibrium, First, Fixed-Bed Column, FTIR, FTIR Spectroscopy, Fungal Biomass, Fungus, Heavy-Metals, Immobilization, Immobilized, Kinetics, Langmuir, Loofa, Loofa Sponge, Methylene Blue, Models, Phanerochaete-chrysosporium, Potential, Procedures, Pseudo Second Order, Pseudo-Second-Order, Reactive Dye, Removal, Rhizopus-arrhizus, Rights, Solutions, Sorption, Spectroscopy, Trichoderma Viride

? Khataee, A.R., Pons, M.N. and Zahraa, O. (2009), Photocatalytic degradation of three azo dyes using immobilized TiO₂ nanoparticles on glass plates activated by UV light irradiation: Influence of dye molecular structure. Journal of Hazardous Materials, 168 (1), 451-457.

Full Text: 2009\J Haz Mat168, 451.pdf

Abstract: In order to discuss the effect of chemical structure on photocatalysis efficiency, the photocatalytic degradation of three commercial textile dyes (C.I. Acid Orange 10 (AO10), C.I. Acid Orange 12 (AO12) and C.I. Acid Orange 8 (AO8)) with different structure and different substitute groups has been investigated using supported TiO₂ photocatalyst under UV light irradiation. All the experiments were performed in a circulation photochemical reactor equipped with a 15-W UV lamp emitted around 365 nm. The investigated photocatalyst was industrial Millennium PC-500 (crystallites mean size 5-10nm) immobilized on glass plates by a heat attachment method. SEM images of the immobilized TiO₂ nanoparticles showed the good coating on the plates, after repeating the deposition procedure three times. Our results indicated that the photocatalytic decolorization kinetics of the dyes were in the order of AO10 > AO12 > AO8. Photocatalytic mineralization of the dyes was monitored by total organic carbon (TOC) decrease, changes in UV-vis spectra and ammonium ion formation. The dye solutions could be completely decolorized and effectively mineralized, with an average overall TOC removal larger than 94% for a photocatalytic reaction time of 6 h. The nitrogen-to-nitrogen double bond of the azo dyes was transformed predominantly into NH(4)(+) ion. The kinetic of photocatalytic decolorization of the dyes was found to follow a first-order rate law. The photocatalysis efficiency was evaluated by figure-of-merit electrical energy per order (E(EO)). (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Adsorption, Azo Dye, Azo Dyes, Decolorization, Electrical Energy, Electricity Consumption, Energy, First Order, Kinetic, Kinetics, Mineralization, Molecular, Parameters, Photocatalysis, Photocatalyst, Photocatalytic, Photocatalytic Degradation, Photochemical, Red, Removal, SEM, Surface, Textile Dyes, Textile Wastewaters, TiO₂, TiO₂ Nanoparticles, Titanium-Dioxide, Toc, Waste-Water

? Tan, X.L., Fang, M., Li, J.X., Lu, Y. and Wang, X.K. (2009), Adsorption of Eu(III) onto TiO₂: Effect of pH, concentration, ionic strength and soil fulvic acid. Journal of Hazardous Materials, 168 (1), 458-465.

Full Text: 2009\J Haz Mat168, 458.pdf

Abstract: The effects of pH, initial Eu(III) concentration, ionic strength and fulvic acid (FA) on the adsorption of Eu(III) on TiO₂ are investigated by using batch techniques. The results indicate that the presence of FA strongly enhances the adsorption of Eu(Ill) on TiO₂ at low pH values. Besides, the adsorption of Eu(III) on TiO₂ is significantly dependent on pH values and independent of ionic strength. The adsorption of Eu(III) on TiO₂ is attributed to inner-sphere surface complexation. The diffuse layer model (DLM) is applied to simulate the adsorption data, and fits the experimental data well with the aid of FITEQL 3.2. X-ray photoelectron spectroscopy (XPS) is performed to study the species of Eu(III) adsorbed on the surfaces of TiO₂/FA-TiO₂ hybrids at a molecular level, which suggest that FA act as “bridge” between Eu(III) and TiO₂ particles to enhance the ability to adsorb Eu(III) in solution. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Adsorption, Alumina, Ca-Montmorillonite, Complexation, Desorption, Dilute Aqueous-Solutions, Elsevier, Eu(III), Europium, FA, Fluorescence Spectroscopy, Fulvic Acid, Humic-Acid, Nuclear-Magnetic-Resonance, Particles, pH, Sorption, Species, Spectroscopy, Surface, Surface Complexation, TiO₂, XPS

? Smičiklas, I., Onjia, A., Raičević, S. and Janaćković, D. (2009), Authors’ response to comments on “Factors influencing the removal of divalent cations by hydroxyapatite” Discussion. Journal of Hazardous Materials, 168 (1), 560-562.

Full Text: 2009\J Haz Mat168, 560.pdf

Abstract: Recently. it has come to our attention, that a polemical note by Milonjic [S.K. Milonjic, Comments on “factors influencing the removal of divalent cations by hydroxyapatite”, J. Hazard. Mater. 162 (2009) 1588-1589]. has been published raising several critical comments on some experimental procedures, as well as the presentation and interpretation of some data found in the cited paper by Smiciklas et al. [L. Smiciklas, A. Onjia. S. Raicevic, Dj. Janackovic, M. Mitric, Factors influencing the removal of divalent cations by hydroxyapatite, J. Hazard. Mater. 152 (2008) 876-884]. Since we have not received any prior copy of this discussion through the process involved in the acceptance of these comments, we now take the opportunity of responding. We have reviewed some scientific papers dealing with cation sorption, in order to demonstrate variety of experimental approaches used for batch sorption tests, regarding solution pH. Finally, we justified experimental methods and data interpretation methods we chose to perform in the mentioned manuscript. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Activated Carbon Cloth, Adsorption, Aqueous-Solutions, Authors, Batch Sorption, Cadmium Uptake, Cation Sorption, Cd(II), Copper Ions, Elsevier, Hydroxyapatite, pH, Point of Zero Charge, Removal, Sorption, Sorption Isotherm, Sr²⁺ Ions, Surface-Properties, Zero Charge

? Bui, T.X. and Choi, H. (2009), Adsorptive removal of selected pharmaceuticals by mesoporous silica SBA-15. Journal of Hazardous Materials, 168 (2-3), 602-608.

Full Text: 2009\J Haz Mat168, 602.pdf

Abstract: The removal of five selected pharmaceuticals, viz., carbamazepine, clofibric acid, diclofenac, ibuprofen, and ketoprofen was examined by batch sorption experiments onto a synthesized mesoporous silica SBA-15. SBA-15 was synthesized and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N-2 adsorption-desorption measurement, and point of zero charge (PZC) measurement. Pharmaceutical adsorption kinetics was rapid and occurred on a scale of minutes, following a pseudo-second-order rate expression. Adsorption isotherms were best fitted by the Freundlich isotherm model. High removal rates of individual pharmaceuticals were achieved in acidic media (pH 3-5) and reached 85.2% for carbamazepine, 88.3% for diclofenac, 93.0% for ibuprofen, 94.3% for ketoprofen, and 49.0% for clofibric acid at pH 3 but decreased with increase in pH. SBA-15 also showed high efficiency for removal of a mixture of 5 pharmaceuticals. Except for cloflbric acid (35.6%), the removal of pharmaceuticals in the mixture ranged from 75.2 to 89.3%. Based on adsorption and desorption results, the mechanism of the selected pharmaceuticals was found to be a hydrophilic interaction, providing valuable information for further studies to design materials for the purpose. The results of this study suggest that mesoporous-silica-based materials are promising adsorbents for removing pharmaceuticals from not only surface water but also wastewater of pharmaceutical industrial manufactures. (c) 2009 Published by Elsevier B.V.

Keywords: Adsorbents, Adsorption, Adsorption Isotherms, Adsorption Kinetics, Adsorption-Desorption, Alumina, Aqueous-Solution, Batch, Charge, Design, Desorption, Diclofenac, Drinking-Water Treatment, Efficiency, Electron Microscopy, Experiments, Expression, Fate, Freundlich, Freundlich Isotherm, Freundlich Isotherm Model, Ibuprofen, Information, Interaction, Isotherm, Isotherm Model, Isotherms, Kinetics, MCM-41, Measurement, Mechanism, Media, Mesoporous, Mesoporous Silica, Mesoporous Silica SBA-15, Model, N₂, N₂, Naproxen, pH, Pharmaceuticals, Point of Zero Charge, Pseudo Second Order, Pseudo-Second-Order, Pseudo-Second-Order Rate, Purpose, Rates, Removal, SBA-15, Scale, Sewage-Treatment Plants, Silica, Sorption, Surface, Surface Water, Surface Waters, TEM, Transmission, Wastewater, Water, X-Ray, X-Ray Diffraction, XRD

? Anandkumar, J. and Mandal, B. (2009), Removal of Cr(VI) from aqueous solution using Bael fruit (Aegle marmelos correa) shell as an adsorbent. Journal of Hazardous Materials, 168 (2-3), 633-640.

Full Text: 2009\J Haz Mat168, 633.pdf

Abstract: In this study, a new activated carbon prepared from non-usable Bael fruit shell (BS) has been used as an efficient low cost adsorbent to remove the Cr(VI) toxic metal from aqueous phase. Batch mode experiments have been performed as a function of initial pH of solution, agitation time, adsorbate concentration and adsorbent dosage. Maximum chromium removal was found at pH 2.0 in an equilibrium time of 240 min by adsorption-coupled reduction. The sorption data fitted satisfactorily with Langmuir as well as Freundlich adsorption model. Evaluation using Langmuir equation gave the monolayer sorption capacity as 17.27 mg/g. Chromium uptake (adsorption-coupled reduction) by Bael fruit shell activated carbon (BSAC) was best described by pseudo-second-order chemisorption model. The progressive changes on surface texture and the confirmation of chromium binding on adsorbent surface at different stages were obtained by the scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and Fourier transform infrared spectrometer (FT-IR) analysis. Phosphoric acid activation played a significant role to develop the well defined pores on adsorbent surface. The results obtained in this study illustrate that the BSAC is expected to be an effective and economically viable adsorbent for Cr(VI) removal from aqueous system. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Acid, Acid Activation, Acid-Activation, Activated Carbon, Activation, Adsorbent, Adsorbent Dosage, Adsorption, Adsorption, Aegle Marmelos Correa, Agitation, Analysis, Aqueous Phase, Aqueous Solution, Bael Fruit Shell, Binding, Biomass, Biosorption, Capacity, Carbon, Changes, Chemisorption, Chromium, Chromium Binding, Chromium Removal, Concentration, Cost, Cr(VI), Cr(VI) Removal, Data, EDS, Electron Microscopy, Energy, Equilibrium, Experiments, Freundlich, FT-IR, FTIR, Function, Hexavalent Chromium, Industrial-Waste, Langmuir, Langmuir Equation, Low Cost, Low Cost Adsorbent, Metal, Mode, Model, Monolayer, pH, Pith, Pseudo Second Order, Pseudo-Second-Order, Reduction, Removal, Rights, Role, Scanning Electron Microscopy, SEM, Solution, Sorption, Sorption Capacity, Spectroscopy, Surface, Toxic, Treated Sawdust, Uptake, Waste-Water, X-Ray

? Wu, P. and Zhou, Y.S. (2009), Simultaneous removal of coexistent heavy metals from simulated urban stormwater using four sorbents: A porous iron sorbent and its mixtures with zeolite and crystal gravel. Journal of Hazardous Materials, 168 (2-3), 674-680.

Full Text: 2009\J Haz Mat168, 674.pdf

Abstract: The selectivity sequence and removal of coexistent heavy metals (namely As, Cd, Cr, Cu, Ni and Zn) in synthetic urban stormwater runoff were investigated by adsorption onto a porous iron sorbent (namely P1) and its mixtures with zeolite and crystal gravel, respectively (namely P2, P3, and P4). A batch method was employed to simulate the sorption processes. The geochemical model PHREEQC was used to calculate the metals’ species and saturation data for elucidating the sorption data. The equilibrium data demonstrated a good fit with the Freundlich model and showed affinity in the orders: Cd > Zn > Ni > Cu > As > Cr (sorbents P1, P3 and P4) and Cd > Zn > Ni > As > Cu > Cr (sorbent P2). In addition to this, Calculated Distribution Coefficient (K-d) values were used to compare the overall heavy metal removal efficiencies of the sorbents, which, in decreasing order. was found to be P4 > P1 > P2 > P3. In comparing these four commercial sorbents, sorbent P4 represents a promising material for treatment of urban stormwater runoff containing mixed heavy metals. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Adsorption, Aqueous-Solution, Cadmium, Cd, Copper(II), Crystal Gravel, Cu, Elsevier, Equilibrium, Ferric Hydroxide GFH, Filter Media, Freundlich, Heavy Metal, Heavy Metal Removal, Heavy Metals, Iron Sorbent, Metal, Metals, Nickel(II), Phreeqc, Removal, Runoff, Sorption, Species, Treatment, Urban Stormwater, Waste-Water, Zeolite, Zn(II)

? Celebi, O., Kilikli, A. and Erten, H.N. (2009), Sorption of radioactive cesium and barium ions onto solid humic acid. Journal of Hazardous Materials, 168 (2-3), 695-703.

Full Text: 2009\J Haz Mat168, 695.pdf

Abstract: In this study, the sorption behavior of two important fission product radionuclides (Cs-137 and Ba-140) onto sodium form of insolubilized humic acid (INaA) were investigated as a function of time, cation concentration and temperature, utilizing the radiotracer method. The sorption processes are well described by both Freundlich and Dubinin-Radushkevich type isotherms. Thermodynamic constants such as: free energy (ΔG(ads)), enthalpy (ΔH-ads), entropy (ΔS-ads) of adsorption were determined. It was found that Ba²⁺ was adsorbed five times more than Cs+ onto structurally modified humic acid and kinetic studies indicated that adsorption behavior of both ions obey the pseudo second order rate law. The effect of pH change on sorption was also examined. FTIR and solid-state carbon NMR ((CNMR)-C-13) spectroscopic techniques were used to understand the structural changes during insolubilization process. Quantitative determination of adsorption sites was carried out using potantiometric titration. (c) 2009 Elsevier B.V. All rights reserved.

Keywords: Adsorption, Adsorption, Adsorption Behavior, Behavior, Carbon, Cation, Cesium, Changes, Clays, Concentration, Cs⁺, Energy, Enthalpy, Entropy, Fractions, Freundlich, FTIR, Function, Humic Acid, Ions, Isotherms, Kinetic, Kinetic Studies, Law, Modified, Natural Kaolinite, NMR, Nuclear-Magnetic-Resonance, pH, Pseudo Second Order, Pseudo-Second-Order, Radioactive Substances, Radionuclides, Radiotracer, Radiotracer Method, Rate Law, Rights, Second Order, Second-Order, Sodium, Sorption, Strontium, Structural-Characterization, Techniques, Temperature, Thermodynamic, Thermodynamic Parameters

? Zhu, C.S., Wang, L.P. and Chen, W.B. (2009), Removal of Cu(II) from aqueous solution by agricultural by-product: Peanut hull. Journal of Hazardous Materials, 168 (2-3), 739-746.

Full Text: 2009\J Haz Mat168, 739.pdf

Abstract: Peanut hull, an agricultural by-product abundant in China, was used as adsorbent for the removal of Cu(II) from aqueous solutions. The extent of adsorption was investigated as a function of pH, contact time, adsorbate concentration and reaction temperature. The Cu(II) removal was pH-dependent, reaching a maximum at pH 5.5. The biosorption process followed pseudo-second-order kinetics and equilibrium was attained at 2 h. The rate constant increased with the increase of temperature indicates endothermic nature of biosorption. The activation energy (E-a) of Cu(II) biosorption was determined at 17.02 kJ/mol according to Arrhenius equation which shows that biosorption may be an activated chemical biosorption. Other activation parameters such as ΔH, ΔS, and ΔG were also determined from Eyring equation. The equilibrium data were analyzed using the Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherm models depending on temperature. The equilibrium biosorption capacity of Cu(II) determined from the Langmuir equation was 21.25 mg/g at 30C. The mean free energy E (kJ/mol) got from the D-R isotherm also indicated a chemical ion-exchange mechanism. The thermodynamic parameters such as changes in Gibbs free energy (ΔG), enthalpy (ΔH) and entropy (ΔS) were used to predict the nature of biosorption process. The negative ΔG values at various temperatures confirm the biosorption processes are spontaneous. (c) 2009 Elsevier B.V. All rights reserved.

Keywords: Activation, Activation Energy, Activation Parameters, Adsorbent, Adsorption, Adsorption Characteristics, Agricultural, Agricultural By-Product, Aqueous Solution, Aqueous Solutions, Biosorption, Biosorption, Capacity, Changes, Chemical, China, Concentration, Copper(II) Ions, Cr(VI) Removal, Cu(II), Cu(II) Biosorption, D-R Isotherm, Data, Endothermic, Energy, Enthalpy, Entropy, Equilibrium, Freundlich, Function, Gibbs Free Energy, Heavy-Metals, Ion Exchange, Ion-Exchange, Ionexchange, Isotherm, Kinetic, Kinetics, Langmuir, Langmuir Equation, Mechanism, Models, Orange Peel, Peanut Hull, pH, pH-Dependent, Pseudo Second Order, Pseudo Second Order Kinetics, Pseudo-Second-Order, Pseudo-Second-Order Kinetics, Rate Constant, Removal, Rights, Solution, Solutions, Sugar-Beet Pulp, Temperature, Thermodynamic, Thermodynamic Parameters, Waste-Water, Wheat Bran

? Xu, Z.H. and Meng, X.G. (2009), Size effects of nanocrystalline TiO₂ on As(V) and As(III) adsorption and As(III) photooxidation. Journal of Hazardous Materials, 168 (2-3), 747-752.

Full Text: 2009\J Haz Mat168, 747.pdf

Abstract: The physicochemical properties of TiO(2) particles in the diameter range between 6.6 and 30.1 nm and the effect of the crystalline size on arsenic adsorption and photocatalytical oxidation were investigated. TiO(2) nanoparticles of different sizes were single-phase anatase. The adsorption capacity of the TiO(2) for As(III) and As(V) increased linearly with the N(2) Brunauer-Emmett-Teller surface area (S(BET)) of the particles. There was not much difference in the rate of As(III) photooxidation when the diameter of the TiO(2) nanoparticles was between 6.6 and 14.8 nm. However, the As(III) photooxidation rate clearly decreased when the particle size increased to 30.1 nm. Arsenite photooxidation data could be fitted with a first-order kinetics equation. Published by Elsevier B.V.

Keywords: Adsorption, Anatase TiO₂, Arsenate, Arsenic, Arsenite, Arsenite, As(III), As(V), Capacity, Catalysts, First Order, Kinetics, Nanostructured TiO₂, Oxidation, Particle-Size, Phase Photooxidation, Photocatalytic Oxidation, Photooxidation, Raman-Spectroscopy, Size Effect, Surface, TiO₂, TiO₂ Nanoparticles, Titanium-Dioxide Nanoparticles

? Moussavi, G. and Mahmoudi, M. (2009), Removal of azo and anthraquinone reactive dyes from industrial wastewaters using MgO nanoparticles. Journal of Hazardous Materials,