Novel Polymeric Sorbents Based on Imprinted Hg (Ⅱ) -Diphenylcarbazone Complexes for Mercury Removal from Drinking Water

摘要

The author reported the preparation of ion-imprinted polymers (IIPs) for the selective removal of Hg (Ⅱ) ions from aqueous media. The Imprinted Technology was used to prepare three polymers in the presence and absence of diphenilcarbazone (DPC)， with the aim of evaluating the influence of this compound on the absorption behavior of polymers. The general procedure of ion-imprinted polymer (IIP) preparation consists of the formation of a ligand-metal complex followed by copolymerization in the presence of an excess of a cross-linking agent. After polymerization, the template ion is removed using a washing procedure, leaving within the polymer network three-dimensional recognition cavities with a predetermined orientation according to their stereochemical interaction with the template metal ion. Only a few studies using mercury as the target ion are reported in literature. For its simplicity, the trapping approach using a non-polymerizable ligand, was the most commonly used. The choice to test DPC as non-polymerizable ligand, arises from its well-known high affinity for mercury ions, which are able to form a stable blue-violet Hg (II)-DPC complex.