Abstract
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.
Published Version
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