Synthesis and evaluation of an ion-imprinted functionalized sorbent for selective separation of cadmium ion

被引:36
作者
Fang, GZ
Tan, J
Yan, XP [1 ]
机构
[1] Nankai Univ, Dept Chem, Res Ctr Analyt Sci, Tianjin 300071, Peoples R China
[2] Yanbei Normal Coll, Dept Chem, Datong, Peoples R China
基金
中国国家自然科学基金;
关键词
cadmium; separation; ion imprinting; mesoporous sorbent;
D O I
10.1081/SS-200054587
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
An ion-imprinted functionalized sorbent for selective separation of Cd2+ from aqueous solution was prepared by molecular imprinting technique in combination with the sol-gel process. The procedures involved the synthesis of mesoporous silica through hydrolysis of tetraethoxysilicate with cetyltrimethylammonium bromide as the structure director, the complex formation between Cd2+ and 3-mercaptopropyltrimethoxysilane, and subsequent co-hydrolysis and co-condensation of the complex with the mesoporous silica. After template Cd2+ was removed with hydrochloric acid, specific cavity for selective recognition of Cd2+ was left. The selectivity of the sorbent was investigated by a batch competitive ion-binding experiment using an aqueous Cd2+ and Pb2+ mixture. The largest selectivity coefficient for Cd2+ in the presence of Pb2+ was found to be over 67, the largest relative selectivity coefficient between Cd2+ and Pb2+ over 18. The uptake capacity and selectivity coefficient of the imprinted functionalized sorbent are higher than those of the nonimprinted sorbent. The sorbent offered a fast kinetics for the extraction/stripping of Cd2+ and good recyclability.
引用
收藏
页码:1597 / 1608
页数:12
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