title: Comparison of Co(2+) adsorption by chitosan and its triethylene-tetramine derivative: Performance and mechanism.
abstract: A cross-linked chitosan derivative (CCTS) was synthesized via cross-linking of epichlorohydrin and grafting of triethylene-tetramine. The adsorption performance and capacity of the raw chitosan (CTS) and its derivative were also investigated for removal of Co(2+) from aqueous solution. A maximum adsorbed amount of 30.45 and 59.51mg/g was obtained for CTS and CCTS, respectively under the optimized conditions. In addition, the adsorption kinetics for the adsorption of Co(2+) by CTS and CCTS were better described by the pseudo second-order equation. The adsorption isotherm of CCTS was well fitted by the Langmuir equation, but the data of the adsorption of Co(2+) onto CTS followed Freundlich and Sips isotherms better. Furthermore, the adsorbent still exhibited good adsorption performance after five regeneration cycles. Finally, Co(2+) removal mechanisms, including physical, chemical, and electrostatic adsorption, were discussed based on microstructure analysis and adsorption kinetics and isotherms. Chemical adsorption was the main adsorption method among these mechanisms.
authors.affiliation: College of Architecture and Environment, Sichuan University, Chengdu 610065, China.
authors.forename: Bing
authors.initials: B
authors.lastname: Liao
authors.affiliation: College of Architecture and Environment, Sichuan University, Chengdu 610065, China.
authors.forename: Wei-Yi
authors.initials: WY
authors.lastname: Sun
authors.affiliation: College of Architecture and Environment, Sichuan University, Chengdu 610065, China.
authors.forename: Na
authors.initials: N
authors.lastname: Guo
authors.affiliation: College of Architecture and Environment, Sichuan University, Chengdu 610065, China.
authors.forename: Sang-Lan
authors.initials: SL
authors.lastname: Ding
authors.affiliation: College of Architecture and Environment, Sichuan University, Chengdu 610065, China. Electronic address: ssjscu@163.com.
authors.forename: Shi-Jun
authors.initials: SJ
authors.lastname: Su
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D003432:Cross-Linking Reagents / Q000737:chemistry*; D004811:Epichlorohydrin / Q000737:chemistry*; D014266:Trientine / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D003432:Cross-Linking Reagents; D014874:Water Pollutants, Chemical; D004811:Epichlorohydrin; D003035:Cobalt; D048271:Chitosan; D014266:Trientine
keywords: Adsorption; Chitosan; Cobalt; Derivative