Personal Research Database

170 (2-3), 836-844.

Full Text: 2009\J Haz Mat170, 836.pdf

Abstract: Nanoparticles of TiO₂ were synthesized and characterized by XRD, BET, TG/DTA and TEM measurements. The commercial azo dye Reactive Red 195 (RR195) was selected as a model dye in order to examine the adsorption capacity of TiO₂ at room temperature, under dark conditions. It was demonstrated that RR195 could be efficiently adsorbed in aqueous suspension of TiO₂. A study on the effects of various parameters like initial pH, concentration of dye and concentration of adsorbent has been carried out in order to find optimum adsorption conditions. The optimum pH of sorption was 3. Substantial reduction of COD, besides removal of colour, was also achieved. The experimental data were analyzed by the Langmuir and Freundlich adsorption models. Equilibrium data fitted very well with the Langmuir model signifying the energetic homogeneity of TiO₂ surface adsorption sites. At the temperature of 30°C. the maximum monolayer adsorption capacity obtained from the Langmuir model is similar to 87 mg/g (pH 3.0). Kinetic studies were carried out and showed a rapid sorption of dye in the first 30 min while equilibrium was reached at 1h. Three kinetic adsorption models were used to describe the kinetics data, the pseudo-first-order model, the pseudo-second-order model and the intraparticle diffusion model. The sorption kinetics of dye was best described by the pseudo-second-order kinetic model. (C) 2009 Published by Elsevier B.V.

Keywords: Activated Carbon, Adsorbent, Adsorbents, Adsorption, Adsorption Capacity, Aqueous Solutions, Azo Dye, Azo-Dyes, Basic Dye, BET, Capacity, COD, Concentration, Data, Diffusion, Diffusion Model, Dye, Equilibrium, Experimental, First, Freundlich, Intraparticle Diffusion, Intraparticle Diffusion Model, Kinetic, Kinetic Adsorption, Kinetic Model, Kinetic Models, Kinetic Studies, Kinetics, Langmuir, Langmuir Model, Model, Models, Monolayer, Nanoparticles, pH, Phenol, Photocatalytic Degradation, Pseudo First Order, Pseudo Second Order, Pseudo-First-Order, Pseudo-Second-Order, Pseudo-Second-Order Kinetic Model, Pseudo-Second-Order Model, Reactive Azo Dye, Reduction, Removal, Room Temperature, Solutions, Sorption, Sorption Kinetics, Surface, Suspension, TEM, Temperature, TiO₂, TiO₂ Nanoparticles, Titanium-Dioxide, XRD

? Bernardo, G.R.R., Rene, R.M.J. and Catalina, A.D.M. (2009), Chromium(III) uptake by agro-waste biosorbents: Chemical characterization, sorption-desorption studies, and mechanism. Journal of Hazardous Materials, 170 (2-3), 845-854.

Full Text: 2009\J Haz Mat170, 845.pdf

Abstract: Within their complex structure, agro-waste materials such as sorghum straw (SS), oats straw (OS) and agave bagasse (AB) have functional groups (i.e. carboxyl and phenolic) that play a major role in metals sorption. The advantages of these materials include availability, low-cost, and a reasonable metal sorption capacity. These agro-waste materials were chemically characterized by acid-base titrations and ATR-FTIR analyses in order to determine their functional groups, equilibrium constants, and surface charge distribution. Batch experiments were conducted at pH 3 and 4, at 25 degrees C and 35 degrees C to determine the biosorbents Chromium(III) sorption capacity. Partially saturated biosorbents were desorbed with HNO3, NaOH, and EDTA at different concentrations and temperatures (25 degrees C, 35 degrees C, and 55 degrees C). Finally, the Chromium(III) sorption mechanism was discussed. Agro-waste materials functional groups are associated, in part, to carboxyl and hydroxyl groups: these oxygen-containing sites play an important role in the Chromium(III) removal. The maximum Chromium(III) sorption capacity was 6.96, 12.97, and 11.44 mg/g at pH 4 for acid-washed SS, OS, and AB, respectively. The Chromium(III) sorption capacity decreased at pH 3 because H+ ions competed for the same functional groups. On the other hand, an increase in temperature enhanced both the biosorbents Chromium(III) sorption capacity and their desorption by EDTA. The most probable Chromium(III) sorption mechanisms were ion exchange and complexation. The agro-waste materials studied herein efficiently remove Chromium(III) from aqueous solution and, most importantly, EDTA can efficiently desorb Cr(III) from agro-waste materials at 55 degrees C. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Adsorption, Agricultural Residues, Aqueous, Aqueous-Solutions, Bagasse, Biomass, Biosorbents, Biosorption, Brown Seaweed, Capacity, Chromium, Complex, Complexation, Cr(III), Desorption, EDTA, Elsevier, Equilibrium, Equilibrium Constants, Functional Groups, Groups, Heavy-Metals, Hexavalent Chromium, Ion Exchange, Mechanism, Mechanisms, Metal, Metals, pH, Removal, Sorption, Surface Charge, Temperature, Trivalent Chromium

? Nityanandi, D. and Subbhuraam, C.V. (2009), Kinetics and thermodynamic of adsorption of chromium(VI) from aqueous solution using puresorbe. Journal of Hazardous Materials, 170 (2-3), 876-882.

Full Text: 2009\J Haz Mat170, 876.pdf

Abstract: This paper deals with an investigation on coir-based adsorbent, puresorbe, in the removal of chromium(VI) from the aqueous solutions. The adsorption of chromium(VI) was carried out by varying the parameters such as agitation time, metal concentration, adsorbent dose, temperature and pH. The experimental isotherm data were analyzed using Langmuir, Freundlich and Redlich and Peterson isotherms. Adsorption followed second order rate expression for the particle size 250-500 mu m at pH 2. The monolayer adsorption capacity is 76.92 mg chromium(VI) per gram of puresorbe. Thermodynamic parameters show the endothermic nature of chromium(VI) adsorption. Desorption study carried out using distilled water adjusted to pH of 2-10. suggests that chemisorption might be the mode of adsorption. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Adsorbent, Adsorbent Dose, Adsorbents, Adsorption, Adsorption Capacity, Adsorption Isotherm, Adsorption Kinetics, Agitation, Aqueous Solution, Aqueous Solutions, Bagasse, Biosorption, Capacity, Chemisorption, Chromium(VI), Coir Based Adsorbent, Coir-Based Adsorbent, Concentration, Data, Desorption, Desorption Study, Endothermic, Experimental, Expression, Freundlich, Heavy-Metal, Industrial-Waste-Water, Investigation, Ions, Isotherm, Isotherms, Kinetics, Langmuir, Metal, Mode, Monolayer, Particle Size, Peat, pH, Removal, Rights, Second Order, Second Order Kinetics, Second-Order, Size, Solution, Solutions, Sorption, Temperature, Thermodynamic, Thermodynamic Parameters, Thermodynamic Studies, Wastewaters, Water

? Svilović, S., Rušić, D. and Stipišić, R. (2009), Modeling batch kinetics of copper ions sorption using synthetic zeolite NaX. Journal of Hazardous Materials, 170 (2-3), 941-947.

Full Text: 2009\J Haz Mat170, 941.pdf

Abstract: The sorptive removal of copper ions from aqueous solutions using zeolite NaX has been studied by a batch technique. The influences of solute concentration, temperature and particle size on the sorption process were examined. Several kinetic models were used to test the experimental rate data and to examine the controlling mechanism of the sorption process. Lagergren pseudo-first order, the pseudo-second-order (Ho) and Ritchie second-order models were analyzed using nonlinear regression technique while Weber-Morris model was analyzed using linear least squares method. The obtained results indicated that synthetic zeolite NaX could be used as an efficient material for the sorption of copper ions. A kinetic study has shown that the best fit is achieved when the Ritchie model was applied and that sorption did not involve film or intraparticle diffusion, i.e., they were not the rate controlling steps. The activation energy was found to be 12 kJ/mol in the present study. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Activated Carbon, Activation, Activation Energy, Aqueous Solutions, Aqueous-Solution, Batch, Cadmium Ions, Concentration, Copper, Data, Diffusion, Energy, Exchange Processes, Experimental, Fixed-Bed, Intraparticle Diffusion, Ions, Kinetic, Kinetic Models, Kinetic Study, Kinetics, Lead Ions, Mechanism, Metal-Ions, Methylene-Blue, Model, Modeling, Models, Nonlinear Regression, Particle Size, Pseudo First Order, Pseudo Second Order, Pseudo-First Order, Pseudo-First-Order, Pseudo-Second-Order, Regression, Removal, Rights, Second Order, Second-Order, Size, Sodium-Ions, Solutions, Sorption, Sorption Process, Temperature, Zeolite, Zeolite NaX

? Rafatullah, M., Sulaiman, O., Hashim, R. and Ahmad, A. (2009), Adsorption of copper(II), chromium(III), nickel(II) and lead(II) ions from aqueous solutions by meranti sawdust. Journal of Hazardous Materials, 170 (2-3), 969-977.

Full Text: 2009\J Haz Mat170, 969.pdf

Abstract: The present study proposed the use of meranti sawdust in the removal of Cu(II), Cr(III), Ni(II) and Pb(II) ions from synthetic aqueous solutions. Batch adsorption studies showed that meranti sawdust was able to adsorb Cu(II), Cr(III), Ni(II) and Pb(II) ions from aqueous solutions in the concentration range 1-200mg/L The adsorption was favoured with maximum adsorption at pH 6, whereas the adsorption starts at pH 1 for all metal ions. The effects of contact time, initial concentration of metal ions, adsorbent dosage and temperature have been reported. The applicability of Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherm was tried for the system to completely understand the adsorption isotherm processes. The adsorption kinetics tested with pseudo-first-order and pseudo-second-order models yielded high R-2 values from 0.850 to 0.932 and from 0.991 to 0.999, respectively. The meranti sawdust was found to be cost effective and has good efficiency to remove these toxic metal ions from aqueous solution. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Acid, Adsorbent, Adsorbent Dosage, Adsorption, Adsorption Isotherm, Adsorption Kinetics, Aqueous Solution, Aqueous Solutions, Batch Adsorption, Chromium, Concentration, Copper, Cost, Cost-Effective, Cr(III), Cu(II), Diffusion, Efficiency, Freundlich, Heavy-Metals, Intraparticle Diffusion, Ions, Isotherm, Kinetic, Kinetics, Langmuir, Lead, Metal, Metal Ions, Models, Natural Zeolites, Ni(II), Nickel, Paper-Industry, Pb(II), Pb(II) Ions, pH, Pseudo First Order, Pseudo Second Order, Pseudo-First-Order, Pseudo-Second-Order, Removal, Rights, Sawdust, Solution, Solutions, Sorption, Temperature, Toxic, Toxic Metal, Waste-Water

? Ncibi, M.C., Ben Hamissa, A.M., Fathallah, A., Kortas, M.H., Baklouti, T., Mahjoub, B. and Seffen, M. (2009), Biosorptive uptake of methylene blue using Mediterranean green alga Enteromorpha spp. Journal of Hazardous Materials, 170 (2-3), 1050-1055.

Full Text: 2009\J Haz Mat170, 1050.pdf

Abstract: Batch biosorption experiments were carried out for the removal of methylene blue, a basic dye, from aqueous solution using raw and dried Enteromorpha spp., Mediterranean green alga. A series of assays were undertaken to assess the effect of the system variables, i.e. contact time, solution pH and sorbent amount. The results had showed that sorption capacity was optimal using 6-10 solution pH range (i.e. maximum adsorption capacity of 274 mg/g). The minimum sorbent concentration experimentally found to be sufficient to reach the total removal of the dye molecules from the aqueous solution was 5 g/L Besides, equilibrium data were fitted using five linearisable isotherm models. The related results showed that the experimental data were very well represented by the Langmuir model for the linear regression analysis and both the Langmuir and Redlich-Peterson isotherm models for the non-linear analysis. In both cases, such modelling behaviour confirms the monolayer coverage of methylene blue molecules onto energetically homogenous Enteromopha surface. in addition, an exhaustive comparative study was done to situate this marine biomass among other proposed sorbents. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Adsorption, Adsorption Capacity, Adsorption-Isotherm, Analysis, Aqueous Solution, Aqueous-Solution, Basic Dye, Basic Dye, Behaviour, Biomass, Biosorption, Capacity, Cationic Dye, Comparative Study, Concentration, Coverage, Data, Dye, Equilibrium, Error Deviation, Experimental, Experiments, Green Alga, Isotherm, Isotherm Modelling, Isotherm Models, Langmuir, Langmuir Model, Linear Regression, Low-Cost Adsorbent, Mediterranean, Methylene Blue, Minimum, Model, Modelling, Models, Monolayer, Non-Linear Analysis, Oceanica L.Fibers, pH, Redlich-Peterson, Regression, Regression Analysis, Removal, Rights, Solution, Sorbent, Sorbents, Sorption, Sorption Capacity, Surface, Ulva-Lactuca, Uptake, Waste-Water

? Zhang, X.L., Hong, H.L., Li, Z.H., Guan, J.F. and Schulz, L. (2009), Removal of azobenzene from water by kaolinite. Journal of Hazardous Materials, 170 (2-3), 1064-1069.

Full Text: 2009\J Haz Mat170, 1064.pdf

Abstract: The use of natural kaolinite clay to remove azobenzene from aqueous solutions under different pHs, ionic strengths. initial solid mass used. and initial solution concentrations was investigated. Batch kinetic experiments showed that the adsorption of azobenzene onto kaolinite followed a pseudo-second-order kinetics with an initial rate of 7.2 mg/g-h and a rate constant of 0.19 g/mg-h. The equilibrium azobenzene adsorption on kaolinite was well described by the Langmuir and Freundlich isotherms with an adsorption capacity of 11 mg/g, or 60 mmol/kg, corresponding to a monolayer adsorption on the surface of kaolinite. Adsorption increased with decreases in solution pH and increases in solution ionic strength. The enthalpy change of adsorption was -38 kJ/mol, suggesting that both physical and chemical adsorption was responsible for the retention of azobenzene on kaolinite. The high affinity of azobenzene for siloxane and gibbsite surfaces was attributed to the attractive Coulombic and van der Waals’ forces between the surface and the planar structure of the organic molecule. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Adsorbents, Adsorption, Adsorption, Adsorption Capacity, Aqueous Solutions, Aqueous-Solution, Azo Dyes, Azobenzene, Capacity, Chemical, Clay, Enthalpy, Equilibrium, Experiments, Freundlich, Gibbsite, Intercalation, Ionic Strength, Isotherm, Isotherms, Kaolinite, Kaolinite Clay, Kinetic, Kinetics, Langmuir, Langmuir and Freundlich Isotherms, Methylene-Blue, Monolayer, Natural, Organic, pH, Physical, Pseudo Second Order, Pseudo Second Order Kinetics, Pseudo-Second-Order, Pseudo-Second-Order Kinetics, Rate Constant, Red, Removal, Retention, Rights, Solution, Solutions, Sorption, Strength, Structure, Surface, Surfaces, Water

? Dai, Y.C., Qian, G.R., Cao, Y.L., Chi, Y., Xu, Y.F., Zhou, J.Z., Liu, Q., Xu, Z.P. and Qiao, S.Z. (2009), Effective removal and fixation of Cr(VI) from aqueous solution with Friedel’s salt. Journal of Hazardous Materials, 170 (2-3), 1086-1092.

Full Text: 2009\J Haz Mat170, 1086.pdf

Abstract: Friedel’s salt (3CaO center dot Al(2)O(3)center dot CaCl(2)center dot 10H(2)O or Ca(4)Al(2)(OH)(12)Cl(2)(H(2)O)(4)) is a calcium aluminate hydrate formed by hydrating cement or concrete in seawater at a low cost. In the current study, we carefully examined the adsorption behaviors of Friedel’s salt for Cr(VI) from aqueous solution at different concentrations and various initial pHs. The adsorption kinetic data are well fitted with the pseudo-first-order Lageren equation at the initial Cr(VI) concentration from 0.10 to 8.00 mM. Both the experimental and modeled data indicate that Friedel’s salt can adsorb a large amount of Cr(VI) (up to 1.4 mmol Cr(VI), g) very quickly (t(1, 2) = 2-3 min) with a very high efficiency (>99% Cr(VI) removal at [Cr] < 4.00 mM with 4.00 g, L of adsorbent) in the pH range of 4-10. In particular, the competitive adsorption tests show that the Cr(VI) removal efficiency is only slightly affected by the co-existence of Cl(-) and HCO(3)(-). The Cr(VI)-fixation stability tests show that only less than 0.2% adsorbed Cr(VI) is leaching out in water at pH 4-10 for 24 h because the adsorption, exchange of Cr(VI) with Friedel’s salt leads to the formation of a new stable phase (3CaO center dot Al(2)O(3)center dot CaCrO(4)center dot 10H(2)O). This research thus suggests that Friedel’s salt is a potential cost-effective adsorbent for Cr(VI) removal in wastewater treatment. (C) 2009 Published by Elsevier B.V.

Keywords: Adsorbent, Adsorption, Adsorption, Exchange, Calcium, Chloride, Chromate Hydrocalumite, Chromate Ions, Competitive Adsorption, Cr(VI), Cr(VI) Fixation, Cr(VI) Removal, Experimental, Friedel’s Salt, Hexavalent Chromium, Hydrotalcite, Kinetic, Layered Double Hydroxides, Layered Double Hydroxides (LDHS), LDH, Mechanism, pH, Pseudo-First-Order, Removal, Research, Solubility, Treatment, Waste-Water, Wastewater, Wastewater Treatment

? Xiong, C.H. and Yao, C.P. (2009), Preparation and application of acrylic acid grafted polytetrafluoroethylene fiber as a weak acid cation exchanger for adsorption of Er(III). Journal of Hazardous Materials, 170 (2-3), 1125-1132.

Full Text: 2009\J Haz Mat170, 1125.pdf

Abstract: In this work, a weakly acidic ion exchange fiber (PTFE-g-AA) has been prepared by Co-60 irradiation grafting with acrylic acid (AA) onto the polytetrafluoroethylene(PTFE) fiber. The grafted fiber was characterized by FTIR, SEM and TGA technique. The exchange capacity of the PTFE-g-AA fiber is 3.87 mmol/g. The adsorbent material was employed for Er(III) uptaking by batch and column experiments. Kinetics studies showed that the adsorption process obeyed pseudo-second-order kinetics. The adsorption isotherms followed both the Freundlich model and Langmuir model. The maximum adsorption capacity of the PTFE-g-AA fiber for Er(III) was evaluated to be 142.0 mg/g for the Langmuir model. It was found that 0.75 M HCl-0.25 M NaCl solution provided effectiveness of the desorption of Er(III) from the PTFE-g-AA fiber. Various thermodynamic parameters such as standard enthalpy (ΔH), standard entropy (ΔS) and standard free energy (ΔG) were evaluated. The adsorption of Er(III) on the PTFE-g-AA fiber was found to be endothermic in nature. The Thomas model was successfully applied to experimental data to predict the breakthrough curves and to determine the characteristics parameters of the column useful for process design. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.

Keywords: Acrylic Acid Grafted Polytetrafluoroethylene Fibers, Activated Carbon, Adsorbent, Adsorption, Adsorption Capacity, Adsorption Isotherms, Application, Aqueous-Solutions, Batch, Breakthrough, Breakthrough Curves, Capacity, Cation, Cation Exchanger, Characteristics, Column, Column Experiments, Cu(II), Data, Design, Desorption, Effectiveness, Endothermic, Energy, Enthalpy, Entropy, Er(III), Experimental, Experiments, Freundlich, Freundlich Model, FTIR, Grafted, Grafting, Ion Exchange, Ion Exchange Fiber, Ion-Exchange, Irradiation, Isotherms, Kinetics, Kinetics, Langmuir, Langmuir Model, Metal-Ions, Model, Nacl, Preconcentration, Process Design, Pseudo Second Order, Pseudo Second Order Kinetics, Pseudo-Second-Order, Pseudo-Second-Order Kinetics, Resin, Rights, SEM, Solution, Sorption, Standard, Styrene, TGA, Thermodynamic, Thermodynamic Parameters, Thomas Model, Water, Work

? Srivastav, A. and Srivastava, V.C. (2009), Adsorptive desulfurization by activated alumina. Journal of Hazardous Materials, 170 (2-3), 1133-1140.

Full Text: 2009\J Haz Mat170, 1133.pdf

Abstract: This study reports usage of commercial grade activated alumina (aluminum oxide) as adsorbent for the removal of sulfur from model oil (dibenthiophene (DBT) dissolved in n-hexane). Bulk density of alumina was found to be 1177.77 kg/m(3). The BET surface area of alumina was found to decrease from 143.6 to 66.4 m(2)/g after the loading of DBT at optimum conditions. The carbon-oxygen functional groups present on the surface of alumina were found to be effective in the adsorption of DBT onto alumina. Optimum adsorbent dose was found to be 20 g/l. The adsorption of DBT on alumina was found to be gradual process, and quasi-equilibrium reached in 24 h. Langmuir isotherm best represented the equilibrium adsorption data. The heat of adsorption and change in entropy for DBT adsorption onto alumina was found to be 19.5 kJ/mol and 139.2 kJ/mol K, respectively. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Activated Alumina, Adsorbent, Adsorbent Dose, Adsorption, Alumina, Aluminum, Aluminum Oxide, Aqueous-Solution, Bagasse Fly-Ash, Bet, Bet Surface Area, Data, Desulfurization, Dibenzothiophene, Diesel Fuel, Dissolved, Entropy, Equilibrium, Fossil-Fuels, Functional Groups, Heat of Adsorption, Isotherm, Isotherm Study, Jet Fuel, Kinetic Study, Langmuir, Langmuir Isotherm, Loading, Metal-Ions, Model, Oxide, Removal, Rights, Selective Adsorption, Sorption, Sulfur, Surface, Surface Area, Thermodynamics, Ultra-Deep Desulfurization

? Huang, X., Liao, X.P. and Shi, B. (2009), Hg(II) removal from aqueous solution by bayberry tannin-immobilized collagen fiber. Journal of Hazardous Materials, 170 (2-3), 1141-1148.

Full Text: 2009\J Haz Mat170, 1141.pdf

Abstract: A novel adsorbent was prepared by immobilizing barberry tannin (BT) onto collagen fiber, which was found effective to remove Hg(II) from aqueous solution. The bayberry tannin-immobilized collagen fiber (BTICF) shows high adsorption capacity to Hg(II) in a wide pH range of 4.0-9.0, and a maximum adsorption capacity (198.49 mg/g) was reached at pH 7.0 and 303 K when the initial concentration of Hg(II) was 200.0 mg/L The adsorption isothermal and kinetic data were well fitted by the Langmuir equation and the pseudo-first-order rate equation, respectively. The adsorption mechanism of BTICF to Hg(II) was proved to follow a chelating reaction. The BTICF can be easily regenerated with 0.1 M lactic acid after adsorption process and recycled at least 4 times without the loss of adsorption capacity. These facts indicate that BTICF can be used as a low-cost adsorbent for effective removal of Hg(II) from aqueous solutions. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.

Keywords: Adsorbent, Adsorption, Adsorption Capacity, Adsorption Isothermal, Adsorption Mechanism, Adsorption Mechanism, Aqueous Solution, Aqueous Solutions, Bayberry Tannin, Capacity, Collagen, Collagen Fiber, Concentration, Data, Dye, Heavy-Metals, Hg(II), Hg(II) Removal, Immobilization, Ion, Isothermal, Kinetic, Lactic Acid, Langmuir, Langmuir Equation, Low Cost, Low Cost Adsorbent, Low-Cost Adsorbent, Mechanism, Mercury, Mercury Removal, Methylene-Blue, Natural Condensed Tannin, pH, Pseudo First Order, Pseudo-First-Order, Removal, Rights, Solution, Solutions, Sorption, Tannin, Waste-Water

? Zhao, B.T., Zhang, Z.X., Jin, J. and Pan, W.P. (2009), Simulation of mercury capture by sorbent injection using a simplified model. Journal of Hazardous Materials, 170 (2-3), 1179-1185.

Full Text: 2009\J Haz Mat170, 1179.pdf

Abstract: Mercury pollution by fossil fuel combustion or solid waste incineration is becoming the worldwide environmental concern. As an effective control technology, powdered sorbent injection (PSI) has been successfully used for mercury capture from flue gas with advantages of low cost and easy operation. In order to predict the mercury capture efficiency for PSI more conveniently, a simplified model, which is based on the theory of mass transfer, isothermal adsorption and mass balance, is developed in this paper. The comparisons between theoretical results of this model and experimental results by Meserole et al. [F.B. Meserole, R. Chang, T.R. Carrey, J. Machac, C.F.J. Richardson, Modeling mercury removal by sorbent injection, J. Air Waste Manage. Assoc. 49 (1999) 694-704] demonstrate that the simplified model is able to provide good predictive accuracy. Moreover, the effects of key parameters including the mass transfer coefficient, sorbent concentration, sorbent physical property and sorbent adsorption capacity on mercury adsorption efficiency are compared and evaluated. Finally, the sensitive analysis of impact factor indicates that the injected sorbent concentration plays most important role for mercury capture efficiency. (C) 2009 Elsevier B.V. All rights reserved.

Keywords: Adsorption, Adsorption Capacity, Capacity, Capture Efficiency, Coal Combustion, Combustion, Elemental Mercury, Elsevier, Flue-Gas, Fly-Ash, Impact, Impact Factor, Impregnated Activated Carbon, Incineration, Mass Transfer, Mercury, Modeling, Plants, Powdered Sorbent Injection, Removal, Simplified Model, Sorption, Technology, Theory

? Zhang, L., Liu, N., Yang, L.J. and Lin, Q. (2009), Sorption behavior of nano-TiO₂ for the removal of selenium ions from aqueous solution. Journal of Hazardous Materials,