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

Abstract

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.

Current status and challenges of ion imprinting

“…The imprinted gel showed strong binding ability to Tb(III). With respect to La(III), 239,240 Ce(III), 241 Gd(III), 242 Dy(III), 243 and Sm(III), 244 only a few studies are reported on their related IIPs.…”

Synthesis and characterization of a new ion-imprinted polymer for the selective separation of thorium(iv) ions at high acidity

“…31 Our research group has ever used HDEHP to extract Th 4+ by reversed micelles with high efficiency. 32,33 Dioleylphosphoric acid 34,35 and 1,12-dodecanediol-O,O 0 -diphenyl phosphonic acid 35 were used as functional ligand to synthesize Zn 2+ -IIP, La 3+ -IIP, Ce 3+ -IIP, and Dy 3+ -IIP. Meanwhile, the Dy 3+ -IIP could be used at pH ¼ 1.…”

“…Meanwhile, the Dy 3+ -IIP could be used at pH ¼ 1. 34 However, to the best of our knowledge, acidic organo-phosphorus compounds have not been used in the preparation of Th 4+ -IIP. Moreover, with respect to organophosphorus monacids, their coordination behaviors with Th 4+ are not well understood.…”