Personal Research Database

Full Text: 2009\J Haz Mat161, 1544.pdf

Abstract: Monoamine modified silica particles (MAMS) were prepared and characterized by infrared (FT-IR) and thermogravimetric analysis (TGA). The modified silica particles were used for removal of acid orange 10 (AO-10) and acid orange 12 (AO-12) from their aqueous solutions. The adsorption behaviour of the two dyes was studied at different experimental conditions of pH, contact time, concentration of dye, temperature and salt solution. The adsorption of AO-10 followed pseudo-first order kinetics whereas AO-12 followed pseudo-second order. The two dyes showed different modes of interaction with silica surface. Desorption of the loaded dyes was carried out at pH 10 and found to be 10.4 and 91.6% for AO-12 and AO-10, respectively. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Acid Dyes, Adsorption, Am, Analysis, Anionic Dyes, Aqueous Solutions, Behaviour, Chitosan, Concentration, Congo-Red, Contact, Desorption, Dye, Dyes, Equilibrium, Experimental, FT-IR, FTIR, Hazard, Infrared, INT, Interaction, Kinetics, Kinetics, Langmuir, Macro, Mater, Modified, Modified Silica, Particles, pH, Pigment, Policies, Policy, Pseudo First Order, Pseudo Second Order, Pseudo-First Order, Pseudo-First-Order, Pseudo-Second Order, Pseudo-Second-Order, Removal, Rights, Salt, SCI, Silica, Solids, Solution, Solutions, Surface, Temperature, Textile Dye, TGA, Thermodynamics, U, Water, Water Treatment

? Choi, H.D., Cho, J.M., Baek, K., Yang, J.S. and Lee, J.Y. (2009), Influence of cationic surfactant on adsorption of Cr(VI) onto activated carbon. Journal of Hazardous Materials, 161 (2-3), 1565-1568.

Full Text: 2009\J Haz Mat161, 1565.pdf

Abstract: The effect of a cationic surfactant on the adsorption of Cr(VI) on activated carbon was investigated using cetylpyridinium chloride (CPC). At a concentration below the critical micelle concentration (CMC) of CPC, the adsorption of CPC and Cr(VI) reached equilibrium within 60 min, while it took 180 min at the concentration above CMC. CPC decreased the adsorption rate of Cr(VI) and increased the adsorption amount of Cr(VI) onto activated carbon. To analyze adsorption phenomena of Cr(VI), adsorption kinetic and isotherm were used and fitted well with the pseudo-second order kinetic model and Langmuir adsorption model, respectively. CPC introduced a cationic functional group on the surface of activated carbon and provided an adsorption site for Cr(VI). (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Activated Carbon, Adsorption, Adsorption Isotherm, Adsorption Kinetic, Adsorption Rate, Anionic Metals, Carbon, Cationic Surfactant, Cetylpyridinium Chloride, Chloride, Chromate, Chromate, CMC, Concentration, CPC, Cr(VI), Critical Micelle Concentration, Desalination, Equilibrium, Fuel, Functional Group, Group, Hazard, HD, Isotherm, Kinetic, Kinetic Model, Langmuir, Mater, Micellar-Enhanced Ultrafiltration, Micelle, Model, Nitrate, Park, Pseudo Second Order, Pseudo Second Order Kinetic, Pseudo-Second Order, Pseudo-Second-Order, Removal Characteristics, Rights, SCI, Site, Surface, Surfactant

? Chen, M., Cui, L., Li, C.H. and Diao, G.W. (2009), Adsorption, desorption and condensation of nitrobenzene solution from active carbon: A comparison of two cyclodextrins and two surfactants. Journal of Hazardous Materials, 162 (1), 23-28.

Full Text: 2009\J Haz Mat162, 23.pdf

Abstract: The adsorption of nitrobenzene on active carbon was researched. The experimental results shown the adsorption of nitrobenzene on active carbon can be described by Freundlich’s adsorption model. On the other hand, beta-cyclodextrin (beta-CD) and hydroxypropyl-beta-cyclodextrin (HP-beta-CD) can react with nitrobenzene to form inclusion complex, which will enhance the aqueous solubility of nitrobenzene. By using different concentrations of beta-CD and HP-beta-CD as extractants, nitrobenzene on active carbon has been desorbed statically. As a comparison, surfactant CTAB and SDS were also selected as extractants. The desorbing of mechanism has been discussed. The low concentration of NB was effectively condensed by enrichment of active carbon and desorption of HP-beta-CD, HP-beta-CD is regarded as a potential extractant to deal with soil, sediment or active carbon. (C) 2008 Published by Elsevier B.V.

Keywords: Active Carbon, Adsorption, Beta-Cyclodextrin, Bioavailability, Carbon, Comparison, Concentration, Condensation, Contaminated Soil, CTAB, Degradation, Desorption, Enhanced Solubilization, Enrichment, Experimental, Extractants, Hydroxypropyl-Beta-Cyclodextrin, Mechanism, Model, Nitrobenzene, Pentachlorophenol, Phenanthrene, Porous-Media, Potential, Removal, SDS, Sediment, Soil, Solubility, Solution, Surfactant, Surfactants, Water

? Qin, Q.D., Ma, J. and Liu, K. (2009), Adsorption of anionic dyes on ammonium-functionalized MCM-41. Journal of Hazardous Materials, 162 (1), 133-139.

Full Text: 2009\J Haz Mat162, 133.pdf

Abstract: Investigations were conducted in a batch reactor system to study the adsorption behavior of four anionic dyes (Methyl orange (MO), Orange IV (OIV), Reactive brilliant red X-3B (X-3B), and Acid fuchsine (AF)) on ammonium-functionalized MCM-41 (NH₃⁺-MCM-41) from aqueous medium by varying the parameters such as contact time, initial dye concentration, pH and competitive anions. Dye adsorption was broadly independent of initial dye concentration. The intraparticle diffusion model was the best in describing the adsorption kinetics for the four anionic dyes on NH₃⁺-MCM-41. The adsorption data for the four dyes were well fitted with the Langmuir model. The electrostatic interaction was considered to be the main mechanism for the dye adsorption. Finally, it was observed that the anion of soft acid inhibited the adsorption capacity significantly. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Activated Carbons, Adsorption, Ammonium-Functionalized MCM-41, Anionic Dye, Aqueous-Solutions, Coal, Equilibrium, Isotherm, Kinetics, Methylene-Blue, pH, Removal, Silica, Waste-Water, Zeolite

? Chutia, P., Kato, S., Kojima, T. and Satokawa, S. (2009), Adsorption of As(V) on surfactant-modified natural zeolites. Journal of Hazardous Materials, 162 (1), 204-211.

Full Text: 2009\J Haz Mat162, 204.pdf

Abstract: Natural mordenite (NM), natural clinoptilolite (NC), HDTMA-modified natural mordenite (SMNM) and HDTMA-modified natural clinoptilolite (SMNC) have been proposed for the removal of As(V) from aqueous solution (HDTMA = hexadecyltrimethylammonium bromide). Influence of time on arsenic sorption efficiency of different sorbents reveals that NM, NC, SMNM and SMNC require about 20, 10, 110 and 20 h. respectively to reach at state of equilibrium. Pseudo-first-order model was applied to evaluate the As(V) sorption kinetics on SMNM and SMNC within the reaction time of 0.5 h. The pseudo-first-order rate constants, k are 1.06 and 0.52 h(-1) for 1 and 0.5 g of SMNM, respectively. The observed k values 1.28 and 0.70 h(-1) for 1 and 0.5 g of SMNC. respectively are slightly high compared to SMNM. Surfactant surface coverage plays an important role and a significant increase in arsenate sorption capacity could be achieved as the HDTMA loading level on zeolite exceeds monolayer coverage. At a surfactant partial bilayer coverage, As(V) sorption capacity of 97.33 and 45.33 mmol kg(-1) derived from Langmuir isotherm for SMNM and SMNC, respectively are significantly high compared to 17.33 and 9.33 mmol kg(-1) corresponding to NM and NC. The As(V) uptake was also quantitatively evaluated using the Freundlich and Dubinin-Kaganer-Radushkevich (DKR) isotherm models. Both SMNM and SMNC removed arsenic effectively over the initial pH range 6-10. Desorption performance of SMNM and SMNC were 66.41% and 70.04%, respectively on 0.1 M NaOH regeneration solution. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Adsorption, Aqueous-Solutions, Arsenate, Arsenic, Arsenic Removal, As(V), Capacity, Chromate, Clinoptilolite, Coverage, Desorption, Drinking-Water, Equilibrium, Freundlich, Hdtma, Heavy-Metal, Hydroxyapatite, Isotherm, Isotherm Models, Kaolinite, Kinetics, Langmuir, Langmuir Isotherm, Metal-Cations, Model, Modified Clinoptilolite, Natural, Natural Zeolite, Natural Zeolites, Nm, pH, Pseudo-First-Order, Regeneration, Removal, Sorption, Sorption, Sorption Kinetics, Surfactant, Surfactant-Modified Zeolite, Uptake, Zeolite

? Vaghetti, J.C.P., Lima, E.C., Royer, B., da Cunha, B.M., Cardoso, N.F., Brasil, J.L. and Dias, S.L.P. (2009), Pecan nutshell as biosorbent to remove Cu(II), Mn(II) and Pb(II) from aqueous solutions. Journal of Hazardous Materials, 162 (1), 270-280.

Full Text: 2009\J Haz Mat162, 270.pdf

Abstract: In the present study we reported for the first time the feasibility of pecan nutshell (PNS, Carya illinoensis) as an alternative biosorbent to remove Cu(II), Mn(II) and Pb(II) metallic ions from aqueous solutions. The ability of PNS to remove the metallic ions was investigated by using batch biosorption procedure. The effects such as, pH. biosorbent dosage on the adsorption capacities of PNS were studied. Four kinetic models were tested, being the adsorption kinetics better fitted to fractionary-order kinetic model. Besides that, the kinetic data were also fitted to intra-particle diffusion model, presenting three linear regions, indicating that the kinetics of adsorption should follow multiple sorption rates. The equilibrium data were fitted to Langmuir, Freundlich, Sips and Redlich-Peterson isotherm models. Taking into account a statistical error function. the data were best fitted to Sips isotherm model. The maximum biosorption capacities of PNS were 1.35, 1.78 and 0.946 mmol g^-1 for Cu(II), Mn(II) and Pb(II), respectively. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Adsorption, Adsorption Kinetic, Araucaria-Angustifolia Wastes, Atomic-Absorption-Spectrometry, Batch Conditions, Biosorption, Biosorption, Divalent Metallic Ion, Equilibrium, Heavy-Metal Ions, Low-Cost Adsorbents, Non-Linear Fitting, Pecan Nutshell, pH, Statistical Design, Toxic Metals

? Hameed, B.H., Krishni, R.R. and Sata, S.A. (2009), A novel agricultural waste adsorbent for the removal of cationic dye from aqueous solutions. Journal of Hazardous Materials, 162 (1), 305-311.

Full Text: 2009\J Haz Mat162, 305.pdf

Abstract: In this paper, pineapple stem (PS) waste, an agricultural waste available in large quantity in Malaysia, was utilized as low-cost adsorbent to remove basic dye (methylene blue, MB) from aqueous solution by adsorption. Batch mode experiments were conducted at 30C to study the effects of initial concentration of methylene blue, contact time and pH on dye adsorption. Equilibrium adsorption isotherms and kinetic were investigated. The experimental data were analyzed by the Langmuir and Freundlich models and the isotherm data fitted well to the Langmuir isotherm with monolayer adsorption capacity of 119.05 mg, g. The kinetic data obtained at different concentrations were analyzed using a pseudo-firstorder and pseudo-second-order equation and intraparticle diffusion equation. The experimental data fitted very well the pseudo-second-order kinetic model. The PS was found to be very effective adsorbent for MB adsorption. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Acid Dye, Activated Carbon, Adsorbent, Adsorption, Adsorption Capacity, Adsorption Isotherm, Adsorption Isotherms, Agricultural, Agricultural Waste, Aqueous Solution, Aqueous Solutions, Azo-Dye, Basic Dye, Batch Mode, Biological Treatment, Capacity, Cationic Dye, Concentration, Contact, Data, Diffusion, Dye, Dye Adsorption, Effects, Equilibrium, Experimental, Experiments, Freundlich, Intraparticle, Intraparticle Diffusion, Isotherm, Isotherms, Kinetic, Kinetic Model, Kinetic-Models, Langmuir, Langmuir Isotherm, Low Cost, Low Cost Adsorbent, Low-Cost Adsorbent, Malachite Green, Malaysia, MB, Methylene Blue, Methylene-Blue Adsorption, Mode, Model, Models, Monolayer, pH, Photocatalytic Degradation, Pineapple Stem, Pseudo Second Order, Pseudo Second Order Kinetic, Pseudo-Second-Order, Pseudo-Second-Order Equation, Pseudo-Second-Order Kinetic Model, Reactive Dye, Removal, Rice Husk, Rights, Solution, Solutions, Waste

? Bansal, M., Garg, U., Singh, D. and Garg, V.K. (2009), Removal of Cr(VI) from aqueous solutions using pre-consumer processing agricultural waste: A case study of rice husk. Journal of Hazardous Materials, 162 (1), 312-320.

Full Text: 2009\J Haz Mat162, 312.pdf

Abstract: This paper reports the feasibility of using pre-consumer processing agricultural waste to remove Cr(VI) from synthetic wastewater under different experimental conditions. For this, rice husk, has been used after pre-treatments (boiling and formaldehyde treatment). Effect of various process parameters, namely, pH, adsorbent dose, initial chromium concentration and contact time has been studied in batch systems. The removal of chromium was dependent on the physico-chemical characteristics of the adsorbent, adsorbate concentration and other studied process parameters. Maximum metal removal was observed at pH 2.0. The efficiencies of boiled and formaldehyde treated rice husk for Cr(VI) removal were 71.0% and 76.5% respectively for dilute solutions at 20 g l^-1 adsorbent dose. The experimental data were analyzed using Freundlich, Langmuir and Dubinin-Radushkevich (D-R) isotherm models. It was found that Freundlich and D-R models fitted well. The results revealed that the hexavalent chromium is considerably adsorbed on rice husk and it could be an economical method for the removal of hexavalent chromium from aqueous systems. FTIR and SEM were recorded, before and after adsorption. to explore number and position of the functional groups available for Cr(VI) binding on to studied adsorbents and changes in adsorbent surface morphology. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Activated Carbon, Adsorption, Adsorption-Kinetics, Ash RHA, Biomass, Biosorption, Chromium Removal, Chromium(VI), FTIR, Heavy-Metals, Ion-Exchange Process, Rice Husk, Sem, Sorption, Water

? Hameed, B.H. (2009), Removal of cationic dye from aqueous solution using jackfruit peel as non-conventional low-cost adsorbent. Journal of Hazardous Materials, 162 (1), 344-350.

Full Text: 2009\J Haz Mat162, 344.pdf

Abstract: This study aimed at investigating the feasibility of using jackfruit peel (IFP), a solid waste, abundantly available in Malaysia, for the adsorption of methylene blue, a cationic dye. Batch adsorption studies were conducted to evaluate the effects of contact time, initial concentration (35-400 mg, L) pH (2-11), and adsorbent dose (0.05-1.20 g) on the removal of dye at temperature of 30C. The experimental data were analyzed by the four different types of linearized Langmuir isotherm, the Freundlich isotherm and the Temkin isotherm. The experimental data fitted well with the type 2 Langmuir model with a maximum adsorption capacity of 285.713 mg, g. Pseudo-first and pseudo-second-order kinetics models were tested with the experimental data, and pseudo-second-order kinetics was the best for the adsorption of MB by JFP with coefficients of correlation R^-2 ≥ 0.9967 for all initial MB concentrations studied. The results demonstrated that the JFP is very effective for the adsorption of methylene blue (MB) from aqueous solutions. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Acid Dye, Activated Carbon, Adsorbent, Adsorbent Dose, Adsorption, Adsorption Capacity, Aqueous Solution, Aqueous Solutions, Artocarpus-Heterophyllus L, Azo-Dye, Basic Dye, Batch Adsorption, Capacity, Cationic Dye, Concentration, Contact, Correlation, Data, Dye, Effects, Experimental, Feasibility, Fixed-Bed, Fly-Ash, Freundlich, Freundlich Isotherm, Isotherm, Jackfruit Peel, Kinetics, Kinetics Models, Langmuir, Langmuir Isotherm, Langmuir Model, Low Cost, Low Cost Adsorbent, Low-Cost Adsorbent, Malachite Green, Malaysia, Mb, Methylene Blue, Methylene-Blue Adsorption, Model, Models, pH, Pseudo Second Order, Pseudo Second Order Kinetics, Pseudo-Second-Order, Pseudo-Second-Order Kinetics, Reactive Dye, Removal, Rights, Solid Waste, Solution, Solutions, Temkin Isotherm, Temperature, Waste

? Jain, M., Garg, V.K. and Kadirvelu, K. (2009), Chromium(VI) removal from aqueous system using Helianthus annuus (sunflower) stem waste. Journal of Hazardous Materials, 162 (1), 365-372.

Full Text: 2009\J Haz Mat162, 365.pdf

Abstract: The objective of this study was to investigate the Cr(VI) removal efficiency of sunflower waste from aqueous system under different process conditions. Two adsorbents were prepared by pre-treating the sunflower stem waste. One adsorbent was prepared by boiling it and second adsorbent was prepared by treating it with formaldehyde. Batch mode experiments were carried out as a function of solution pH, adsorbent dosage, Cr(VI) concentration and contact time. FT-IR spectra and SEMs of the adsorbents were recorded to explore the number and position of functional groups available for the binding of Cr(VI) ions and morphology of the studied adsorbents. The removal of chromium was dependent on the physicochemical characteristics of the adsorbent, adsorbate concentration and other studied process parameters. Maximum metal removal was observed at pH 2.0. The efficiencies of boiled sunflower stem absorbent and formal dehyde-treated sunflower stem absorbent for the removal of Cr(VI) were 81.7 and 76.5%, respectively for dilute solutions at 4.0 g/L adsorbent dose. The applicability of Langmuir, Freundlich and Dubinin-Rad ushkevich isotherms was also tested. The results revealed that the hexavalent chromium is considerably adsorbed on sunflower stem and it could be an economical method for the removal of hexavalent chromium from aqueous systems. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Activated Carbon, Adsorbents, Adsorption, Adsorption, Biosorption, Chromium, Chromium(VI), Color Removal, Cr(VI) Removal, Formaldehyde, FTIR, Heavy-Metals, Isotherm, Kinetics, Metal Removal, Sawdust, Sunflower

? Bouberka, Z., Khenifi, A., Mahamed, H.A., Haddou, B., Belkaid, N., Bettahar, N. and Derriche, Z. (2009), Adsorption of Supranol Yellow 4 GL from aqueous solution by surfactant-treated aluminum/chromium-intercalated bentonite. Journal of Hazardous Materials, 162 (1), 378-385.

Full Text: 2009\J Haz Mat162, 378.pdf

Abstract: The aim of this paper is to study the adsorption of the acid dye Supranol Yellow 4 GL(S.Y. 4 GL) from aqueous solution on an inorgano-organo clay. Bentonite is naturally occurring clay with good exchanging ability. By exchanging its interlamellar cations with cetyltrimethylammonium bromide (CTAB) and hydroxyaluminic or chromium polycations, the properties of natural bentonite can be greatly improved. Batch adsorption tests of Supranol Yellow 4 GL were carried out at 20C and constant pH 6.5. To investigate the adsorption mechanisms, the simplified kinetic models. such as pseudo-first-order, pseudo-second-order, Elovich equation and intraparticle diffusion are tested. The results show that adsorption follows second-order rate kinetic. The correlation coefficients obtained for second-order kinetics model are greater than 0.998 indicating a better fitting of this equation. The experimental data are analysed by Langmuir, Freundlich and Elovich isotherms. The equilibrium adsorption capacity of anionic dye is determined from the Langmuir equation and found to be 142, 85 and 128, 20 mg, g (standard deviation: Delta q 3.52 and 18.51) for CTAB-Cr-B and CTAB-Al-B, respectively. (C) 2008 Elsevier B.V. All rights reserved.

Keywords: Acid Dye, Adsorption, Adsorption Capacity, Adsorption Mechanisms, Aqueous Solution, Batch Adsorption, Bentonite, Bromide, Capacity, Chromium, Clay, Correlation, CTAB, Data, Diffusion, Dye, Elovich, Elovich Equation, Equilibrium, Experimental, Freundlich, Intercalated Clay, Intraparticle, Intraparticle Diffusion, Isotherms, Kinetic, Kinetic Models, Kinetics, Kinetics Model, Langmuir, Langmuir Equation, Mechanisms, Model, Models, Montmorillonite, Natural, Part I, pH, Phenol, Pillared Clay Catalysts, Pseudo First Order, Pseudo Second Order, Pseudo-First-Order, Pseudo-Second-Order, Removal, Rights, Second Order, Second Order Kinetics, Second-Order, Second-Order Kinetics, Smectite, Solution, Sorption, Standard, Supranol Yellow 4 GL, Surfactant, Water

? Chutia, P., Kato, S., Kojima, T. and Satokawa, S. (2009), Arsenic adsorption from aqueous solution on synthetic zeolites. Journal of Hazardous Materials, 162 (1), 440-447.

Full Text: 2009\J Haz Mat162, 440.pdf

Abstract: The adsorption of arsenic from aqueous solution on synthetic zeolites H-MFI-24(H24) and H-MFI-90(H90) with MFI topology has been investigated at room temperature (r.t) applying batch equilibrium techniques. The influences of different sorption parameters such as contact time. solution pH, initial arsenic concentration and temperature were also studied thoroughly in order to optimize the reaction conditions. The adsorption of arsenic on to H24 and H90 follows the first-order kinetics and equilibrium time was about 100 min for both the adsorbents. The first-order rate constant (k), 4.7 x 10(-3) min(-1) for H90 is more than two times higher in magnitude compared to 2.1 x 10(-3) min(-1) for H24. Adsorption performance of H90 is higher compared to H24 due to it’s highly mesoporous nature which in turn accelerates the diffusion process during adsorption. As(V) sorption capacity derived from Langmuir isotherm for H24 and H90 are 0.0358 and 0.0348 g g(-1), respectively. Arsenic uptake was also quantitatively evaluated using the Freundlich and Dubinin-Kaganer-Raclushkevich (DKR) isotherm models. Ion exchange between adsorbent’s terminal aluminol groups with different predominant forms of arsenate in solution is one of the various important reactions occurred during adsorption process. (c) 2008 Elsevier B.V. All rights reserved.

Keywords: Activated Carbon, Adsorbents, Adsorption, Adsorption Isotherms, Arsenate, Arsenic, As(V), Cadmium, Capacity, Contaminated Water, Diffusion, Equilibrium, First Order, Freundlich, Hydroxyapatite, Ion Exchange, Ion-Exchange, Ions, Isotherm, Isotherm Models, Kinetics, Langmuir, Langmuir Isotherm, Metal-Cations, Natural Zeolites, pH, Point Of Zero Charge, Rate Constant, Removal, Sorption, Synthetic Zeolites, Uptake

? Nadavala, S.K., Swayampakula, K., Boddu, V.M. and Abburi, K. (2009), Biosorption of phenol and o-chlorophenol from aqueous solutions on to chitosan-calcium alginate blended beads. Journal of Hazardous Materials, 162 (1), 482-489.

Full Text: 2009\J Haz Mat162, 482.pdf

Abstract: Beads of chitosan-sodium alginate are prepared from naturally occurring biopolymers, chitosan (a cationic polysaccharide) and sodium alginate (an anionic polysaccharide). These beads are treated with CaCl₂ in order to improve the stability as well as the sorption capacity of the biosorbent. The resulting chitosan-alginate beads are characterized by BET surface area analysis, Fourier transformer infrared spectroscopy (FTIR) and wide-angle X-ray diffraction (WXRD) techniques. The efficiency of the biosorbent is studied by measuring the uptake using the equilibrium batch technique and breakthrough curves obtained from column flow experiments. The effect of pH, contact time, initial concentration of adsorbate and amount of biosorbent on adsorption capacity of the biosorbent is investigated. The equilibrium adsorption data are fitted to first-order and second-order kinetic equations, and to Weber-Morris model. The Freundlich, Langmuir and Dubinin-Radushkevich (D-R) adsorption isotherm models are used for the description of the biosorption process. Further, column break-through curves are obtained and the sorbent loaded with phenol and o-chlorophenol is regenerated using 0.1 M NaOH solution. The experimental results suggest that the chitosan-calcium alginate blended biosorbent is effective for the removal of phenol and o-chlorophenol from an aqueous medium. (c) 2008 Elsevier B.V. All rights reserved.

Keywords: Activated Carbon, Adsorption, Adsorption Capacity, Adsorption Isotherm, Adsorption Isotherm Models, Alginate, Analysis, Aqueous Medium, Aqueous Solutions, Batch, Beads, BET, BET Surface Area, Biopolymers, Biosorbent, Biosorption, Breakthrough, Breakthrough Curves, Capacity, Chitin, Chitosan, Chitosan-Alginate Blended Beads, Column, Concentration, Contact, Data, Effect of pH, Efficiency, Equilibrium, Experimental, Experiments, First Order, Flow, Flow Experiments, Freundlich, FTIR, Infrared, Infrared Spectroscopy, Isotherm, Isotherm Models, Kinetic, Kinetic Equations, Langmuir, Model, Models, NaOH, O-Chlorophenol, pH, Phenol, Polysaccharide, Process, Release, Removal, Resin, Rights, Second Order, Second-Order, Sodium, Sodium Alginate, Solution, Solutions, Sorbent, Sorption, Sorption Capacity, Spectroscopy, Stability, Surface, Surface Area, Techniques, Uptake, Water, X-Ray, X-Ray Diffraction

? Ho, Y.S. (2009), Comment on “Thermodynamics and kinetics of adsorption of Cu(II) onto waste iron oxide”. Journal of Hazardous Materials,