Development of Novel Metal Ion Selective Ion-exchange Resin Based on Surface Template Polymerization

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It becomes an important research area to develop highly selective metal-chelating resin in regard to reusing metal sources. It is necessary to establish the methodology for producing materials (host or artificial receptor) that have specific ability for ion recognition. Surface imprinting is an approach to introduce special molecular recognition sites on the oil-water interface during the synthesis of ion-exchange resins.We synthesized Cu (II)-and Zn (II)-imprinted resins because these are typical metal ions which have different coordination mode. We chose oleic histamine amide as a functional monomer and divinylbenzene as a cross-linker. The imprinted resins have higher activities for absorption of metal ions but have less selectivity. For improvement of the metal ion selectivity, we stabilized the o/w emulsion during the polymerization by adding co-surfactants. In the case of adding nonion surfactant, the selectivity for Cu (II) was remarkably improved. We also prepared Cd (II)-imprinted resins that have high selectivity for Cd (II). We synthesized imprinted resins for lanthanide ions such as Eu (III) and La (III) by using surfactants containing phosphoric ester groups. In the case of using DOLPA as a functional monomer, Eu (III)-imprinted resin showed high selectivity for Eu (III).It is demonstrated the possibilty of applying the surface imprinted resins as novel materials for separating metal ions. Surface imprinting that we have been newly developed is a useful method for ion-exchange resins, because it is possible to improve the metal ion selectivities by various combination of designed functional surfactant and co-surfactant.