Removal of trace Cr(VI) from water using chitosan-iron nanowires in porous anodic alumina

作     者：Li Sun Zhigang Yuan Wenbang Gong Zili Xu Jijun Lu Qinghua Zou Yuqin Wu Gongbing Su Huafang Wang 

作者机构：School of Mechanical Engineering and Automation Wuhan Textile University 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2016年第59卷第4期

页      面：383-386页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by China Textile Industry Association Guide Science and Technology Project (2013039) the National Natural Science Foundation of China (51375351) 

主　　题：chitosan-iron nanowires isotherms Cr(VI) thermodynamics adsorption kinetics 

摘      要：Chitosan-iron nanowires in porous anodic alumina （PAA） have been successfully prepared under ambient conditions as an ad- sorbent. The adsorbent was characterized by scanning electron microscopy, X-ray photoelectron spectroscopy and N2-BET surface area. The results showed that PAA can disperse and protect Fe0 nanorods from oxidation. The adsorption characteris- tics of trace Cr（VI） onto adsorbent have been examined at different initial Cr（VI） concentrations with pH 5. Batch adsorption studies show that the removal percentage of adsorbent for the removal of trace Cr（VI） is strongly dependent on the initial Cr（VI） concentrations. Langmuir and Freundlich isotherm models were used to analyze the experiment data. The adsorption of trace Cr（VI） by adsorbent is well modeled by the Langmuir isotherm and the maximum adsorption capacity of Cr（VI） is calcu- lated as 123.95 mg/g which is very closed to the experiment results. Intraparticle diffusion study shows that the intraparticle diffusion of adsorbent is not the sole rate-controlling step. The negative value of Gibbs free energy change,△G0, indicated that the process of Cr（VI） onto adsorbent was spontaneous. This work has demonstrated that chitosan-iron nanowires in porous anodic alumina as an adsorbent has promising potential for heavy metal removal at trace level.