Cr(VI) adsorption on an improved synthesised cross-linked chitosan resin

详细信息    查看全文

• 作者：Zhenjun Wu ; Shunyi Li ; ^{lsy76@zzu.edu.cn} ; Junfeng Wan ; Yan Wang
• 关键词：Chitosan ; Crosslink ; Cr(VI) ; Adsorption isotherm ; Modelling
• 刊名：Journal of Molecular Liquids
• 出版年：2012
• 出版时间：June, 2012
• 年：2012
• 卷：170
• 期：Complete
• 页码：25-29
• 全文大小：876 K

文摘

An improved drop-sphere-forming method to synthesise chitosan resin was investigated as a possible means to remove Cr(VI) from wastewater. Epichlorohydrin was used to cross-link the resin to enhance its rigidity. The Cr(VI) adsorption capacity of the cross-linked chitosan was investigated under the influence of time, pH, temperature and the initial concentration of Cr(VI). The pH was found to be the main factor determining adsorption capacity. After 2 h of adsorption at pH = 3.0 and 25 ¡ãC with an adsorbent dosage of 2 g L^?#xA0;1, the maximum adsorption capacity was reached for an initial Cr(VI) concentration of 30 mg L^?#xA0;1. The equilibrium adsorption experiments corresponded well with the Langmuir isotherm (r² > 0.99). The pseudo-first-order and pseudo-second-orders were applied to describe the kinetics of the process. Compared with a pseudo-first-order kinetic model, the pseudo-second-order kinetic model exhibited a better correlation with the experimental data (r² > 0.99).