Analytical Sciences

Lanthanoid Element Recognition on Surface-Imprinted Polymers Containing Dioleylphosphoric Acid as a Functional Host

Kazuya UEZU,*¹ Tamaki KUWABARA,*² Masahiro YOSHIDA,*³ Masahiro GOTO,*² and Shintaro FURUSAKI*⁴

*1 Department of Chemical Processes and Environments, Faculty of Environmental Engineering, The University of Kitakyushu, Hibikino, Kitakyushu 808-0135, Japan
*2 Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, Hakozaki, Fukuoka 812-8581, Japan
*3 Department of Applied Chemistry and Chemical Engineering, Kagoshima University, Kagoshima 890-0065, Japan
*4 Department of Applied Life Science, Faculty of Engineering, Sojo University, Ikeda, Kumamoto 860-0082, Japan

Surface-imprinted polymers have been newly developed for the separation of lanthanoid elements: i.e. La(III), Ce(III), and Dy(III). The imprinted polymers were prepared by surface template polymerization with dioleylphosphoric acid, which exhibits a high affinity to lanthanoids, as a functional host molecule. Separation behavior of La(III), Ce(III) and Dy(III) was investigated with the imprinted polymers, and the imprinting effect of the polymers was evaluated in comparison with that of the unimprinted polymers and also with a conventional solvent extraction method for the same lanthanoid ions. The results indicate that the increase of selectivity for Dy(III) compared to the rest of the ions by the surface-imprinted polymers originated from a synergistic effect of both the affinity with the functional host molecule in nature and the size exclusion by the cavity formed on the polymer surface.

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