title: Removal of cobalt(II) ion from aqueous solution by chitosan-montmorillonite.
abstract: Montmorillonite (MMT) modified with chitosan (CTS, molecular weight=5×10(4)) was applied to remove heavy metal cations by using Co(2+) as a model ion. An increase in MMT interlayer distance observed from X-ray diffraction indicates the intercalation of CTS into MMT. Together with the results of scanning electron microscopy and Fourier transform infrared spectroscopy, it was concluded that the composite material of CTS and MMT (CTS-MMT) was prepared successfully. The mass ratio of CTS to MMT had a strong influence on the adsorption performance of CTS-MMT. The highest adsorption value of 150mg/g was obtained over the composite material with CTS to MMT mass ratio of 0.25, which is much higher than those reported in other studies. The adsorption isotherms and kinetic results indicated that Co(2+) was adsorbed over CTS-MMT in a multilayer model, and the chemical sorption of Co(2+) was determined to be the rate-limiting step.
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. Electronic address: wanghailin@cee.cn.
authors.forename: Hailin
authors.initials: H
authors.lastname: Wang
authors.affiliation: Key Laboratory of Applied Surface and Colloid Chemistry, Shanxi Normal University, Xi'an 710062, China; School of Chemistry & Chemical Engineering, Shanxi Normal University, Xi'an 710062, China.
authors.forename: Haoqing
authors.initials: H
authors.lastname: Tang
authors.affiliation: Key Laboratory of Applied Surface and Colloid Chemistry, Shanxi Normal University, Xi'an 710062, China; School of Chemistry & Chemical Engineering, Shanxi Normal University, Xi'an 710062, China.
authors.forename: Zhaotie
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Zhengping
authors.initials: Z
authors.lastname: Hao
authors.affiliation: Key Laboratory of Applied Surface and Colloid Chemistry, Shanxi Normal University, Xi'an 710062, China; School of Chemistry & Chemical Engineering, Shanxi Normal University, Xi'an 710062, China. Electronic address: zwliu@snnu.edu.cn.
authors.forename: Zhongwen
authors.initials: Z
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D003035:Cobalt / Q000302:isolation & purification*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D014874:Water Pollutants, Chemical; D001546:Bentonite; D003035:Cobalt; D048271:Chitosan
keywords: Chitosan; Co(2+); Isotherm; Kinetics; Montmorillonite