超分子结构纤维素基吸附剂对水体中钴离子的去除  

Removal of cobalt ions from water by cellulose-based adsorbents with supramolecular structure

作　　者：龚文丽 丁雁鸿 张晨一 刘琳[1] 姚菊明[1] GONG Wenli;DING Yanhong;ZHANG Chenyi;LIU Lin;YAO Juming(School of Materials Science&Engineering,Zhejiang Sci-Tech University,Hangzhou Zhejiang,310018)

机构地区：[1]浙江理工大学材料科学与工程学院,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2021年第5期604-611,共8页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：国家自然科学基金项目(51672251)。

摘　　要：以纤维素为原料,采用高碘酸钠氧化后接枝支化聚乙烯亚胺,制备超分子结构纤维素基吸附剂(Supramolecular amino-functionalized cellulose,SAC),并分析SAC去除Co^(2+)离子的能力,并通过FTIR、EDS、吸附动力学和吸附等温线模型探究其去除机理。结果表明:SAC能快速去除Co^(2+)离子,在10 min内达到吸附平衡;吸附容量随着pH值的增加而增加,吸附效率随着温度的增加而降低;SAC对Co^(2+)离子的吸附是一个自发的放热过程,符合伪二级吸附动力学和Langmuir等温吸附模型,SAC对Co^(2+)最大吸附容量为52.63 mg/g;SAC对Co^(2+)离子的高效去除效率是静电作用、配位络合及离子交换共同作用。为水体中Co^(2+)离子的去除提供了一种新方法。Supramolecular amino-functionalized cellulose(SAC)was prepared,with cellulose as the raw material,which was oxidized by sodium periodate first and then grafted with branched polyethyleneimine.SAC′s ability to remove Co^(2+)ions was analyzed and its removal mechanism was investigated by FTIR,EDS,adsorption kinetics and adsorption isotherm models.The results show that SAC can remove Co^(2+)ions quickly and reach adsorption equilibrium within 10 min,the adsorption capacity increases as the pH value increases,and the adsorption efficiency decreases as the temperature increases.The analysis of the adsorption process indicates that the adsorption of Co^(2+)ions by SAC is a spontaneous exothermic process,which conforms to the pseudo-second-order adsorption kinetics and Langmuir adsorption model,and the maximum adsorption capacity of SAC for Co^(2+)is 52.63 mg/g.The efficient removal efficiency of SAC for Co^(2+)ions is due to the combined action of electrostatic interaction,coordination complexation and ion exchange.This paper provides a new method for the removal of Co^(2+)ions from water.

关 键 词：超分子结构 纤维素 钴离子去除 吸附 静电相互作用 配位络合 

分 类 号：X524[环境科学与工程—环境工程]