title: Mechanism of enhanced Sb(V) removal from aqueous solution using chemically modified aerobic granules.
abstract: Sb(V) removal using Fe-modified aerobic granules was investigated. Increasing the biomass dosage improved the Sb(V) removal rate, but lowered the adsorption quantity; the optimal biomass concentration was 20 g/L (wet basis). Adsorption equilibrium was obtained at 2h at 175 rpm; the adsorption quantity was 36.6 mg/g. NaCl and other salts inhibited Sb(V) adsorption on Fe-modified granules, and the mechanism possibly lied more with the anions. The adsorption isotherms were evaluated using the Langmuir, Freundlich, and Temkin models. The Langmuir model best described the adsorption process, and gave a maximum monolayer adsorption quantity of 125 mg/g. The ΔH value for adsorption was 16.1 kJ/mol, indicating endothermicity, and the negative ΔG values at various temperatures suggested spontaneous adsorption. Outer-sphere and inner-sphere complexations were involved in Sb(V) adsorption.
authors.affiliation: Center of Analysis and Measurement, Fudan University, Shanghai 200433, China. Electronic address: wangl@fudan.edu.cn.
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.affiliation: Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China.
authors.forename: Chun-li
authors.initials: CL
authors.lastname: Wan
authors.affiliation: Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan.
authors.forename: Duu-Jong
authors.initials: DJ
authors.lastname: Lee
authors.affiliation: Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Liu
authors.affiliation: Center of Analysis and Measurement, Fudan University, Shanghai 200433, China.
authors.forename: Xiao-feng
authors.initials: XF
authors.lastname: Chen
authors.affiliation: Department of Civil Engineering, University of Calgary, Calgary, Canada. Electronic address: jhatay@ucalgary.ca.
authors.forename: Joo-Hwa
authors.initials: JH
authors.lastname: Tay
mesh_terms: D000327:Adsorption; D000838:Anions; D000965:Antimony / Q000032:analysis / Q000737:chemistry*; D018533:Biomass; D002412:Cations; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007501:Iron / Q000737:chemistry; D008670:Metals / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry*; D013053:Spectrophotometry; D055672:Static Electricity; D013696:Temperature; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D000838:Anions; D002412:Cations; D007477:Ions; D008670:Metals; D014874:Water Pollutants, Chemical; D000965:Antimony; D007501:Iron; D010100:Oxygen
keywords: Adsorption; Aerobic granules; Mechanism; Modification