Adsorption behaviour of Fe(II) and Fe(III) ions in aqueous solution on chitosan and cross-linked chitosan beads

被引：371
|
作者：
Ngah, WSW [1 ]
Ab Ghani, S [1 ]
Kamari, A [1 ]
机构：
[1] Univ Sains Malaysia, Sch Chem Sci, George Town 11800, Malaysia
来源：
BIORESOURCE TECHNOLOGY | 2005年 / 96卷 / 04期
关键词：
chitosan beads; cross-linked chitosan beads; adsorption capacities; adsorption rates; adsorption isotherm;
D O I：
10.1016/j.biortech.2004.05.022
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
A batch adsorption system was applied to study the adsorption of Fe(II) and Fe(III) ions from aqueous solution by chitosan and cross-linked chitosan beads. The adsorption capacities and rates of Fe(II) and Fe(III) ions onto chitosan and cross-linked chitosan beads were evaluated. Chitosan beads were cross-linked with glutaraldehyde (GLA), epichlorohydrin (ECH) and ethylene glycol diglycidyl ether (EGDE) in order to enhance the chemical resistance and mechanical strength of chitosan beads. Experiments were carried out as function of pH, agitation period, agitation rate and concentration of Fe(II) and Fe(III) ions. Langmuir and Freundlich adsorption models were applied to describe the isotherms and isotherm constants. Equilibrium data agreed very well with the Langmuir model. The kinetic experimental data correlated well with the second-order kinetic model, indicating that the chemical sorption was the rate-limiting step. Results also showed that chitosan and cross-linked chitosan beads were favourable adsorbers. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码：443 / 450
页数：8
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