title: Synthesis of chitosan/γ-Fe2O3/fly-ash-cenospheres composites for the fast removal of bisphenol A and 2,4,6-trichlorophenol from aqueous solutions.
abstract: The chitosan/fly-ash-cenospheres/γ-Fe(2)O(3) (CTS/γ-Fe(2)O(3)/FACs) magnetic composites were prepared by microemulsion process. The resulting composites were characterized by XRD, FT-IR, SEM, TGA, DTG and VSM, and the results indicated that CTS/γ-Fe(2)O(3)/FACs exhibited magnetic property (M(s)=6.553 emu g(-1)) and thermal stability, and composed of chitosan wrapping magnetic γ-Fe(2)O(3) and fly-ash-cenospheres (thickness of the cross-linked chitosan was about 5.2 μm). Then the CTS/γ-Fe(2)O(3)/FACs were employed as adsorbents for the fast removal of bisphenol A (BPA) and 2,4,6-trichlorophenol (TCP) from aqueous solutions. The adsorption performances of CTS/γ-Fe(2)O(3)/FACs were investigated by batch mode experiments with respect to pH, temperature, initial concentration, contact time and binary solution system. The Langmuir isotherm model was fitted to the equilibrium data better than the Freundlich model, and the kinetic properties were well described by the pseudo-second-order equation. The effects of binary solution systems also demonstrated that BPA adsorption onto CTS/γ-Fe(2)O(3)/FACs was more affected by the simultaneous presence of competitive phenolic compound than that of TCP. In addition, the resulting composite reusability without obviously deterioration in performance was demonstrated by at least three repeated cycles.
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.
authors.forename: Jianming
authors.initials: J
authors.lastname: Pan
authors.forename: Hang
authors.initials: H
authors.lastname: Yao
authors.forename: XiuXiu
authors.initials: X
authors.lastname: Li
authors.forename: Bing
authors.initials: B
authors.lastname: Wang
authors.forename: Pengwei
authors.initials: P
authors.lastname: Huo
authors.forename: Wanzhen
authors.initials: W
authors.lastname: Xu
authors.forename: Hongxiang
authors.initials: H
authors.lastname: Ou
authors.forename: Yongsheng
authors.initials: Y
authors.lastname: Yan
mesh_terms: D000327:Adsorption; D001559:Benzhydryl Compounds; D002244:Carbon / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D002733:Chlorophenols / Q000302:isolation & purification*; D060729:Coal Ash; D004655:Emulsions; D005290:Ferric Compounds / Q000737:chemistry*; D009153:Mutagens; D052638:Particulate Matter / Q000737:chemistry*; D010636:Phenols / Q000302:isolation & purification*; D012996:Solutions; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D002244:Carbon; D048271:Chitosan; D002733:Chlorophenols; D060729:Coal Ash; D004655:Emulsions; D005290:Ferric Compounds; D009153:Mutagens; D052638:Particulate Matter; D010636:Phenols; D012996:Solutions; D014874:Water Pollutants, Chemical; C000499:ferric oxide; C024564:2,4,6-trichlorophenol; C006780:bisphenol A; D000098826:Bisphenol A Compounds