Removal of cobalt(II) ion from aqueous solution by chitosan-montmorillonite

Hailin Wang; Haoqing Tang; Zhaotie Liu; Xin Zhang; Zhengping Hao; Zhongwen Liu

doi:10.1016/j.jes.2014.06.021

Removal of cobalt(II) ion from aqueous solution by chitosan-montmorillonite

J Environ Sci (China). 2014 Sep 1;26(9):1879-84. doi: 10.1016/j.jes.2014.06.021. Epub 2014 Jul 2.

Authors

Hailin Wang¹, Haoqing Tang², Zhaotie Liu², Xin Zhang³, Zhengping Hao³, Zhongwen Liu⁴

Affiliations

¹ Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. Electronic address: wanghailin@cee.cn.
² 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.
³ Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
⁴ 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.

PMID: 25193838
DOI: 10.1016/j.jes.2014.06.021

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.

Keywords: Chitosan; Co(2+); Isotherm; Kinetics; Montmorillonite.

Publication types

Evaluation Study
Research Support, Non-U.S. Gov't

MeSH terms

Adsorption
Bentonite / chemistry*
Chitosan / chemistry*
Cobalt / isolation & purification*
Water Pollutants, Chemical / isolation & purification*

Substances

Water Pollutants, Chemical
Bentonite
Cobalt
Chitosan