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Book title: Molecular and Ionic Recognition with Imprinted Polymers
Editors: Bartsch RA, Maeda M
Publisher: The American Chemical Society
City: Washington DC
Series title: ACS Symposium Series
Volume number: 703

Abstract: Based upon the concept of Surface Imprinting proposed by the authors in 1992, metal ion-imprinted microspheres have been prepared by seeded emulsion polymerization of divinylbenzene, styrene, butyl acrylate, and methacrylic acid. The imprinted structure was introduced on the carboxylated microsphere by Surface Imprinting in which the carboxyl groups of mobile, linear polymers are reorganized through complexation with metal ions on the surface and then fixed by crosslinking polymerization in their organized orientation. The print metal ion species was then removed by washing with hydrochloric acid to give Cu(II)-, Ni(II)-, and Co(II)-irnprinted microspheres as spherical submicron particles with average diameters of 0.55-0.60 mm. Without further treatment, such as grinding or sieving, the imprinted microspheres were used as metal ion-selective adsorbents. Their adsorption behavior towards Cu(II), Ni(II), and Co(II) was examined. It was found that the imprinted microspheres readsorbed the "print" metal ion species more efficiently than did analogous unimprinted microspheres. Some spectroscopic studies were conducted for Cu(1I)-loaded microspheres. The data indicate that the origin of the imprinting effect on a Cu(II)-imprinted microsphere is interaction between Cu(II) and carboxylate groups at the aqueous-organic interface, which supports the concept of Surface Imprinting