title: Chitosan resins synthesised by improved drop-sphere-forming method for Cr(VI) removal from aqueous solutions.
abstract: An improved drop-sphere-forming (IDSF) method was applied to synthesise chitosan resin. Chitosan resin was synthesised by the self-made device and cross-linked with epichlorohydrin. The influences of concentration of chitosan-acetic acid solution, air flow, reaction time and the dosage of epichlorohydrin were investigated during synthesising. The satisfactory chitosan particles were prepared by chitosan-acetic acid solution (3%) under a controlled air flow of 0.6 m(3) h(-1), After 6 h of reaction at 80 °C with an epichlorohydrin dosage of 2 mL per 5 mL wet resin, the chitosan cross-linked resin has the best adsorption capacity. After 2 h of adsorption at pH = 3.0 and 25 °C with an adsorbent dosage of 2 g L(-1), the maximum adsorption capacity (112 mg g(-1)) was reached for an initial Cr(VI) concentration of 146 mg L(-1). Compared with other adsorbents, this synthesis method was simple and economic; moreover, the cross-linked chitosan resin can remove Cr(VI) efficiently.
authors.affiliation: School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou City, China. lsy76@zzu.edu.cn
authors.forename: Shunyi
authors.initials: S
authors.lastname: Li
authors.forename: Zhenjun
authors.initials: Z
authors.lastname: Wu
authors.forename: Bin
authors.initials: B
authors.lastname: Li
authors.forename: Rencheng
authors.initials: R
authors.lastname: Zhu
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000031:analogs & derivatives* / Q000138:chemical synthesis*; D002857:Chromium / Q000302:isolation & purification*; D003432:Cross-Linking Reagents / Q000737:chemistry; D004811:Epichlorohydrin / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D003432:Cross-Linking Reagents; D014874:Water Pollutants, Chemical; D004811:Epichlorohydrin; D002857:Chromium; D048271:Chitosan