Personal Research Database

Full Text: 2009\J Haz Mat166, 88.pdf

Abstract: The adsorption behavior of crystal violet (CV(+)) from aqueous solution onto magnesium-oxide coated bentonite (MCB) sample was investigated as a function of parameters such as initial CV(+) concentration, contact time and temperature. The Langmuir, and Freundlich adsorption models were applied to describe the equilibrium isotherms. The Langmuir monolayer adsorption capacity of MCB were estimated as 496 mg/g. The pseudo-first-order, pseudo-second-order kinetic and the intra-particle diffusion models were used to describe the kinetic data and rate constants were evaluated. The values of the energy (E(a)), enthalpy (Delta H(not equal)) and entropy of activation (Delta S(not equal)) were 56.45 kJ/mol, 53.90 kJ/mol and -117.26 J/mol K, respectively, at pH 6.5. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Activated Carbon, Activation, Adsorption, Adsorption-Kinetics, Agricultural Waste, Basic Dye, Behavior, Bentonite, Capacity, Cationic Dye, Clay, Component Systems, Crystal Violet, Diffusion, Dye Adsorption, Dye Removal, Energy, Equilibrium, Fly-Ash, Freundlich, Intraparticle Diffusion, Isotherms, Kinetic, Kinetics, Langmuir, Modified, Modified Diatomite, Organic Cation, pH, Pseudo-First-Order, Pseudo-Second-Order, Removal, X-Ray Diffraction, Zinc Sorption

? Yang, S.T., Li, J.X., Shao, D.D., Hu, J. and Wang, X.K. (2009), Adsorption of Ni(II) on oxidized multi-walled carbon nanotubes: Effect of contact time, pH, foreign ions and PAA. Journal of Hazardous Materials, 166 (1), 109-116.

Full Text: 2009\J Haz Mat166, 109.pdf

Abstract: The adsorption of Ni(II) on oxidized multi-walled carbon nanotubes (MWCNTs) as a function of contact time, pH and foreign ions in the absence and presence of polyacrylic acid (PAA) was studied using batch technique. The results indicated that adsorption of Ni(II) on oxidized MWCNTs increased from zero to similar to 99% at pH 2-9, and then maintained the high level with increasing pH. Kinetic data showed that the adsorption process achieved equilibrium within 2 h and experimental data were fitted well by the pseudo-second-order equation. A positive effect of PAA on Ni(II) adsorption was found at pH < 8, whereas a negative effect was observed at pH > 8. The effect of addition sequences of PAA, Ni(II) on the adsorption of Ni(II) to PAA-MWCNT hybrids were also studied. The results indicated that the adsorption of Ni(II) was influenced by addition sequences obviously. The adsorption of Ni(II) on oxidized MWCNTs may be mainly attributed to surface complexation and ion exchange. Oxidized MWCNTs are suitable material in the solidification and pre-concentration of Ni(II) from aqueous solutions. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Adsorption, Aqueous-Solution, Carbon Nanotubes, Complexation, Desorption, Equilibrium, Experimental, Foreign Ions, Ion Exchange, Ions, Kinetic, Multiwalled Carbon Nanotubes, MWCNTs, Na-Rectorite, Ni(II), Ni²⁺, Nickel, Oxide, PAA, pH, Pseudo-Second-Order, Removal, Sorption, Strength, Temperature

? Achak, M., Hafidi, A., Ouazzani, N., Sayadi, S. and Mandi, L. (2009), Low cost biosorbent “banana peel” for the removal of phenolic compounds from olive mill wastewater: Kinetic and equilibrium studies. Journal of Hazardous Materials, 166 (1), 117-125.

Full Text: 2009\J Haz Mat166, 117.pdf

Abstract: The aim of this work is to determine the potential of application of banana peel as a biosorbent for removing phenolic compounds from olive mill wastewaters. The effect of adsorbent dosage, pH and contact time were investigated. The results showed that the increase in the banana peel dosage from 10 to 30 g, L significantly increased the phenolic compounds adsorption rates from 60 to 88%. Increase in the pH to above neutrality resulted in the increase in the phenolic compounds adsorption capacity. The adsorption process was fast, and it reached equilibrium in 3-h contact time. The Freundlich and Langmuir adsorption models were used for mathematical description of the adsorption equilibrium and it was found that experimental data fitted very well to both Freundlich and Langmuir models. Batch adsorption models, based on the assumption of the pseudo-first-order, pseudo-second-order and intraparticle diffusion mechanism, showed that kinetic data follow closely the pseudo-second-order than the pseudo-first-order and intraparticle diffusion. Desorption studies showed that low pH value was efficient for desorption of phenolic compounds. These results indicate clearly the efficiency of banana peel as a low-cost solution for olive mill wastewaters treatment and give some preliminary elements for the comprehension of the interactions between banana peel as a bioadsorbent and the very polluting compounds from the olive oil industry. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Adsorbent, Adsorption, Adsorption, Adsorption Equilibrium, Anaerobic-Digestion, Antioxidants, Aqueous-Solutions, Banana Peel, Basic-Dyes, Batch, Batch Adsorption, Capacity, Congo-Red, Desorption, Diffusion, Equilibrium, Experimental, Freundlich, Granular Activated Carbon, Industry, Intraparticle Diffusion, Kinetic, Langmuir, Low Cost, Mechanism, Olive Mill Wastewaters, Packed-Bed, pH, pH Value, Phenolic Compounds, Pith, Pseudo-First-Order, Pseudo-Second-Order, Removal, Treatment, Wastewater, Wastewaters

? Li, K.Q., Zheng, Z., Huang, X.F., Zhao, G.H., Feng, J.W. and Zhang, J.B. (2009), Equilibrium, kinetic and thermodynamic studies on the adsorption of 2-nitroaniline onto activated carbon prepared from cotton stalk fibre. Journal of Hazardous Materials, 166 (1), 213-220.

Full Text: 2009\J Haz Mat166, 213.pdf

Abstract: Activated carbon prepared from cotton stalk fibre has been utilized as an adsorbent for the removal of 2-nitroaniline from aqueous solutions. The influence of adsorbent mass, contact time and temperature on the adsorption was investigated by conducting a series of batch adsorption experiments. The equilibrium data at different temperatures were fitted with the Langmuir, Freundlich, Tempkin, Redlich-Peterson and Langmuir-Freundlich models. The Langmuir-Freundlich isotherm was found to best describe the experimental data. The adsorption amount increased with increasing temperature. The maximum adsorption capacity of 2-nitroaniline was found to be 383 mg, g for initial 2-nitroaniline concentration of 200 mg, L at 45 degrees C. The kinetic rates were modeled by using the Lagergren-first-order, pseudo-second-order and Elovich models. The pseudo-second-order model was found to explain the adsorption kinetics most effectively. It was also found that the pore diffusion played an important role in the adsorption, and intraparticle diffusion was the rate-limiting step at the first 30 min for the temperatures of 25, 35 and 45 degrees C. FTIR and (13)C NMR study revealed that the amino and isocyanate groups present on the surface of the adsorbent were involved in chemical interaction with 2-nitroaniline. The negative change in free energy (Delta G degrees) and positive change in enthalpy (Delta H degrees) indicated that the adsorption was a spontaneous and endothermic process. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved.

Keywords: Activated Carbon, Adsorbent, Adsorption, Adsorption Isotherm, Adsorption Kinetics, Aqueous-Solutions, Batch Adsorption, Capacity, Copyright, Cotton Stalk Activated Carbon, Diffusion, Dye, Energy, Equilibrium, Experimental, Freundlich, FTIR, Intraparticle Diffusion, Isotherm, Kinetic, Kinetics, Langmuir, Langmuir-Freundlich Isotherm, Methylene-Blue, Model, NMR, Peat, Pseudo-Second-Order, Removal, Sawdust, Soil, Sorption, Surface, Thermodynamics

? Hameed, B.H. (2009), Grass waste: A novel sorbent for the removal of basic dye from aqueous solution. Journal of Hazardous Materials, 166 (1), 233-238.

Full Text: 2009\J Haz Mat166, 233.pdf

Abstract: The aim of the present work was to investigate the feasibility of grass waste (GW) for methylene blue (MB) adsorption. The adsorption of MB on GW material was studied as a function of GW dose (0.05-1.20 g), solution pH 3-10, contact time and initial concentration (70-380 mg/L). The influence of these parameters on the adsorption capacity was studied using the batch process. The experimental data were analyzed by the Langmuir and Freundlich isotherms. The adsorption isotherm was found to follow the Langmuir model. The monolayer adsorption capacity was found to be 457.640 mg/g. The kinetic data were fitted to the pseudo-first-order and pseudo-second-order models, and were found to follow closely the pseudo-second-order kinetic model. The results revealed that GW adsorbent is potentially low-cost adsorbent for adsorption of MB. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Activated Carbons, Adsorbent, Adsorption, Adsorption Isotherm, Agricultural Waste, Basic Dye, Capacity, Equilibrium, Experimental, Feasibility, Fly-Ash, Freundlich, Freundlich Isotherms, Grass Waste, Isotherm, Isotherms, Kinetic, Kinetic Model, Kinetics, Kinetics, Langmuir, Langmuir And Freundlich Isotherms, Langmuir Model, Malachite Green, Methylene Blue, Methylene-Blue Adsorption, Model, pH, Pseudo-First-Order, Pseudo-Second-Order, Reactive Dye, Removal, Sorbent, Sorption

? Lu, D.D., Cao, Q.L., Cao, X.J. and Luo, F. (2009), Removal of Pb(II) using the modified lawny grass: Mechanism, kinetics, equilibrium and thermodynamic studies. Journal of Hazardous Materials, 166 (1), 239-247.

Full Text: 2009\J Haz Mat166, 239.pdf

Abstract: A series of new chemical-modified lawny grass adsorbents were prepared and the feasibility of absorbents to remove Pb(II) ion from aqueous solution was examined. The absorbents were characterized by FTIR spectra and elemental analysis. Kinetics, equilibrium, thermodynamics, column adsorption and mechanism were studied. The optimum pH is in the range of 5.0-5.8 for all adsorbents. The sorption system follows pseudo-second-order kinetic model and equilibrium time is obtained after 60 min. The maximum adsorption capacities obtained from Langmuir-Freundlich model are 1.55 and 1.26 mol/kg by using 1 CG and 0.6 CG (lawny grass modified by 1 mol/L or 0.6 mol/L citric acid, respectively). Thermodynamic parameters such as Delta G, Delta H and Delta S are evaluated for the adsorption process. The results indicates that the adsorption of Pb(II) is spontaneous and endothermic. The breakthrough point is achieved at 100 BV (bed volume) by a column of 0.6 CG. Desorption of Pb(II) and regeneration of the column is achieved by 0.1 mol/L HCl elution. After 3 adsorption/desorption cycles, the breakthrough point remains around 100 BV, which shows that grass adsorbent is regenerated easily and used repeatedly. Above results indicates that lawny grass have a good potential for removal of lead from dilute aqueous solution in the future. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Activated Carbons, Adsorbent, Adsorption, Adsorptive Removal, Analysis, Aqueous-Solution, Biosorption, Column, Desorption, Equilibrium, Feasibility, FTIR, Heavy-Metals, Ions, Kinetic, Kinetic Model, Kinetics, Lawny Grass Cellulose, Lead, Lead, Mechanism, Model, Modified, Pb(II), Pb(II) Ion, pH, Pseudo-Second-Order, Regeneration, Removal, Rice Husk, Sorption, Surface-Chemistry, Thermodynamic, Thermodynamic Parameters, Thermodynamics

? Qiu, J.Y., Wang, Z.Y., Li, H.B., Xu, L., Peng, J., Zhai, M.L., Yang, C., Li, J.Q. and Wei, G.S. (2009), Adsorption of Cr(VI) using silica-based adsorbent prepared by radiation-induced grafting. Journal of Hazardous Materials, 166 (1), 270-276.

Full Text: 2009\J Haz Mat166, 270.pdf

Abstract: Silica-based adsorbent was prepared by radiation-induced grafting of dimethylaminoethyl methacrylate (DMAEMA) onto the silanized silica followed by a protonation process. The FTIR spectra and XPS analysis proved that DMAEMA was grafted successfully onto the silica Surface. The resultant adsorbent manifested a high ion exchange capacity (IEC) of ca. 1.30 mmol/g and the Cr(VI) adsorption behavior of the adsorbent was further investigated, revealing the recovery of Cr(VI) increased with the adsorbent feed and the equilibrium adsorption could be achieved within 40 min. The adsorption capacity, strongly depended on the pH of the solution, reached a maximum Cr(VI) uptake (ca. 68 mg/g) as the pH was in the range of 2.5-5.0. Furthermore, even in strong acidic (4.0 mol/L HNO₃) or alkaline media (pH 11.0), the adsorbent had a sound Cr(VI) uptake capacity (ca. 22 and 30 mg/g, respectively), and the adsorption followed Langmuir mode. The results indicated that this adsorbent, prepared via a convenient approach, is applicable for removing heavy-metal-ion pollutants (e.g. Cr(VI)) from waste waters. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Silica, Radiation Grafting, Adsorbent, Dimethylaminoethyl Methacrylate, Cr(VI), Anion-Exchange Membrane, Solid-Phase Extraction, Carbon Fabric Cloth, Metal-Ions, Hexavalent Chromium, Induced Polymerization, Sorption Capacity, Activated Carbons, Mesoporous Silica, Heavy-Metals

? Singh, V., Sharma, A.K. and Sanghi, R. (2009), Poly(acrylamide) functionalized chitosan: An efficient adsorbent for azo dyes from aqueous solutions. Journal of Hazardous Materials, 166 (1), 327-335.

Full Text: 2009\J Haz Mat166, 327.pdf

Abstract: In the present communication we report on the optimization of persulfate/ascorbic acid initiated synthesis of chitosan-graft-poly(acrylamide) (Ch-g-PAM) and its application in the removal of azo dyes. The optimum yield of the copolymer was obtained using 16 x 10(-2) M acrylamide, 3.0 x 10(-2) M ascorbic acid, 2.4 x 10(-3) M K(2)S(2)O(8) and 0.1 g chitosan in 25 mL of 5% aqueous formic acid at 45 +/- 0.2 degrees C. Ch-g-PAM remained water insoluble even under highly acidic conditions and could efficiently remove Remazol violet and Procion yellow dyes from the aqueous solutions over a pH range of 3-8 in contrast to chitosan (Ch) which showed pH dependent adsorption. The adsorption data of the Ch-g-PAM and Ch for both the dyes were modeled by Langmuir and Freundlich isotherms where the data fitted better to Langmuir isotherms. To understand the adsorption behavior of Ch-g-PAM, adsorption of Remazol violet on to the copolymer was optimized and the kinetic and thermodynamic studies were carried out taking Ch as reference. Both Ch-g-PAM and Ch followed pseudo-second-order adsorption kinetics. The thermodynamic study revealed a positive heat of adsorption (Delta H degrees), a positive Delta S degrees and a negative Delta G degrees, indicating spontaneous and endothermic nature of the adsorption of RV dye on to the Ch-g-PAM. The Ch-g-PAM was found to be very efficient in removing color from real industrial wastewater as well, though the interfering ions present in the wastewater slightly hindered its adsorption capacity. The data from regeneration efficiencies for ten cycles evidenced the high reusability of the copolymer in the treatment of waste water laden with even high concentrations of dye. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Activated Carbon, Adsorbent, Adsorption, Adsorption, Adsorption Kinetics, Azo Dyes, Behavior, Capacity, Chitosan, Chitosan-Graft-Poly(Acrylamide), Communication, Freundlich, Freundlich Isotherms, Green, Industrial Wastewater, Ions, Isotherms, Kinetic, Kinetics, Langmuir, Langmuir And Freundlich Isotherms, Langmuir Isotherms, Low-Cost Adsorbents, Methylene-Blue, Model, pH, Procion Yellow, Pseudo-Second-Order, Reactive Dyes, Regeneration, Remazol Violet, Removal, Treatment, Waste-Water, Wastewater

? Kalmykova, Y., Stromvall, A.M., Rauch, S. and Morrison, G. (2009), Peat filter performance under changing environmental conditions. Journal of Hazardous Materials, 166 (1), 389-393.

Full Text: 2009\J Haz Mat166, 389.pdf

Abstract: Peat is a candidate filter material for in situ treatment of urban runoff. contaminated groundwater and landfill leachates. Until now research has focused on peat sorption in batch experiments and there is a lack of knowledge on peat performance in filter beds. In this project column tests were carried out to evaluate the capacity of peat to remove As, Cd, Cu, Cr, Ni, Pb and Zn in multi-metal solution under a range of environmental conditions that may be encountered in real-life applications (draining, water stagnation, freezing, change in pH and metal concentrations, input of NaCl and elevated DOC). The removal capacity was 91-98% for Cd, Cu, Zn, Ni and Pb and the efficiency was unaffected by the changes of physical factors, but temporarily inhibited for solutions containing NaCl. Leaching of DOC from peat was detected in the initial samples and temporarily decreased metal removal. The peat filters showed high removal rates for Cd, Cu, Zn, Ni and Pb under all experimental conditions and are recommended for treatment of waters containing these elements. In contrast, peat was not found to be efficient for treatment of As and Cr in the multi-metal contaminated water at the pH range (6.7-8.0) studied. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Acid, Adsorption, Batch, Batch Experiments, Capacity, Cd, Changes, Column, Column Tests, Contaminated Groundwater, Cu, Doc, Efficiency, Environmental, Experimental, Experiments, Filter, Groundwater, Heavy-Metals, In Situ, Kinetics, Knowledge, Landfill, Landfill Leachate, Leachates, Metal, Metals, NaCl, Pb, Peat, Performance, pH, Physical, Rates, Removal, Research, Rights, Runoff, Solution, Solutions, Sorption, Treatment, Urban, Urban Runoff, Waste-Water, Water, Waters

? Yeom, B.Y., Lee, C.S. and Hwang, T.S. (2009), A new hybrid ion exchanger: Effect of system parameters on the adsorption of vanadium(V). Journal of Hazardous Materials, 166 (1), 415-420.

Full Text: 2009\J Haz Mat166, 415.pdf

Abstract: The hybrid ion exchanger consisted of PONF-g-GMA anion fibrous exchanger and IRA-96 bead-type anion exchanger was developed by combining different types of layers with hot-melt adhesive. Its ion exchange capacity and the pressure drop with flow rate of water were measured and the adsorption of vanadium(V) ions on the hybrid ion exchanger was evaluated with various process parameters such as pH, initial concentration, and temperature. It was observed that the adsorption kinetics of vanadium(V) ions on the hybrid ion exchanger could be analyzed with pseudo-second-order model. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Adsorption, Adsorption Kinetics, Aerosol Filtration, Anion Exchanger, Aqueous-Solution, Capacity, Chitosan, Fibers, Hybrid, Ion Exchange, Ion Exchange Capacity, Ions, Kinetics, Kinetics, Metal-Ions, Model, pH, Ponf-G-Gma, Preconcentration, Pressure, Process Parameters, Pseudo-Second-Order, Removal, Silica, Sorption, Vanadium

? Ijagbemi, C.O., Baek, M.H. and Kim, D.S. (2009), Montmorillonite surface properties and sorption characteristics for heavy metal removal from aqueous solutions. Journal of Hazardous Materials, 166 (1), 538-546.

Full Text: 2009\J Haz Mat166, 538.pdf

Abstract: Surface properties of montmorillonite (MMT) and its adsorption characteristics for heavy metals have been investigated with nickel and copper as sorbate from aqueous solutions. Employing the potentiometric and mass titration techniques in batch experimental methods, the point of zero charge (PZC) and point of zero net proton charge (PZNPC) of MMT edges at different ionic strengths present pH(PZC) and pH(PZNPC) to be 3.4 +/- 0.2. A crossing point was observed for the proton adsorption vs. pH curves at different ionic strengths of KCl electrolyte and in investigating MMT remediation potentialities as sorbent for heavy metals polluted waters. the effects of heavy metal concentration, pH, MMT dosage, reaction time and temperature for Cu(2+) and Ni(2+) uptake were studied. The sorption of metal ions by MMT was pH dependent and the adsorption kinetics revealed sorption rate could be well fitted by the pseudo-second-order rate model. The data according to mass transfer and intraparticle diffusion models confirmed diffusion of solutes inside the clay particles as the rate-controlling step and more important for the adsorption rate than the external mass transfer. Adsorption isotherms showed that the uptake of Cu(2+) and Ni(2+) could be described by the Langmuir model and from calculations on thermodynamic parameters, the positive Delta G degrees values at different temperatures suggest that the sorption of both metal ions were non-spontaneous. Change in enthalpy (Delta H degrees) for Ni(2+) and Cu(2+) were 28.9 and 13.27 kJ/mol K respectively, hence an endothermic diffusion process, as ion uptake increased with increase in temperature. Values of Delta S degrees indicate low randomness at the solid/solution interface during the uptake of both Cu(2+) and Ni2+ by MMIT Montmorillonite has a considerable potential for the removal of heavy metal cationic species from aqueous solution and wastewater. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Acid-Base Properties, Adsorption, Adsorption Isotherms, Adsorption Kinetics, Adsorption Rate, Bentonite, Clay, Copper, Cu²⁺, Diffusion, Equilibrium, Experimental, Heavy Metal, Heavy Metal Sorption, Heavy Metals, Intraparticle Diffusion, Ions, Isotherms, Kaolinite, Kinetics, Langmuir, Langmuir Model, Mass Transfer, Metal, Metal Ions, Metals, Model, Montmorillonite, Ni²⁺, Nickel, pH, Pseudo-Second-Order, Remediation, Removal, Sensitivity, Sorbent, Sorption, Surface Properties, Thermodynamic Parameters, Uptake, Waste-Water, Wastewater, Zero Charge

? Mata, Y.N., Torres, E., Blázquez, M.L., Ballester, A., Gonzalez, F. and Muñoz, J.A. (2009), Gold(III) biosorption and bioreduction with the brown alga Fucus vesiculosus. Journal of Hazardous Materials, 166 (2-3), 612-618.

Full Text: 2009\J Haz Mat166, 612.pdf

Abstract: In this paper, the bioreduction of Au(III) to Au(0) using biomass of the brown alga Fucus vesiculosus was investigated. The recovery and reduction process took place in two stages with an optimum pH range of 4-9 with a maximum uptake obtained at pH 7. In the first stage, an induction period previous to gold reduction, the variation of pH, redox potential and gold concentration in solution was practically negligible and no color change was observed. In the second stage, the gold reduction was followed by a sharp decrease of gold concentration, pH and redox potential of solution and a color change from yellow to reddish purple. Hydroxyl groups present in the algal polysaccharides were involved in the gold bioreduction. Metallic gold was detected as microprecipitates on the biomass surface and in colloidal form as nanoparticles in the solution. Bioreduction with F vesiculosus could be an alternative and environmentally friendly process that can be used for recovering gold from dilute hydrometallurgical solutions and leachates of electronic scraps. and for the synthesis of gold nanoparticles of different size and shape. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Biomass, Bioreduction, Biosorption, Elsevier, Fucus Vesiculosus, Gold, Gold Nanoparticles, Groups, Heavy-Metals, Ions, Nanoparticles, pH, Polysaccharides, Recovery, Solutions, Waste

? Tsai, W.T., Hsien, K.J. and Hsu, H.C. (2009), Adsorption of organic compounds from aqueous solution onto the synthesized zeolite. Journal of Hazardous Materials, 166 (2-3), 635-641.

Full Text: 2009\J Haz Mat166, 635.pdf

Abstract: A novel zeolite was synthesized. characterized and employed for the adsorption of methylene blue (cationic dye) and bisphenol-A in aqueous solution. The pore properties of the synthesized zeolite have been determined using N(2) adsorption-desorption isotherms. indicating that it is a supermicroporous adsorbent with BET surface area of over 400 m(2) g(-1). Based on the XRD image, it was indicative of the probable formation of zeolite-P2 in the hydrothermal synthesis. The metal content and zeta-potential of the zeolite were also measured to examine the hydrophilicity and the effect of pH on the surface charge, respectively. It was found that the synthesized zeolite exhibited significantly higher adsorption capacity for methylene blue than that for bisphenol-A due to the difference in molecular properties. Kinetic studies at 25 degrees C indicated that the adsorption of methylene blue well followed the pseudo-second-order model and could be elucidated by considering the pore property and surface charge of the synthesized zeolite. The kinetic parameters thus obtained from the fittings of the model were dependent on initial dye concentration, pH, and adsorbent mass. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Adsorbent, Adsorption, Adsorption-Desorption, Basic-Dyes, Bisphenol A, Bisphenol-A, Bleaching Earth, Capacity, Clay, Hydrophobic Zeolite, Isotherms, Kinetic, Kinetic Modeling, Kinetic Studies, Liquid-Phase Adsorption, Metal, Methylene Blue, Methylene-Blue, Model, Molecular, Organic Compounds, pH, Pseudo-Second-Order, Removal, Surface Charge, Synthesized Zeolite, Waste-Water, XRD, Zeolite, Zeta Potential

? Renman, A., Renman, G., Gustafsson, J.P. and Hylander, L. (2009), Metal removal by bed filter materials used in domestic wastewater treatment. Journal of Hazardous Materials,