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    Ligand confinement and pure aqueous medium synthesis of novel ion imprinted membranes for advanced rare earth separation

    Year: 2022

    Journal: Appl. Surf. Sci., Volume 588, JUN 30

    Authors: Chen, Li; Wang, Yitan; Dai, Jiangdong; Meng, Minjia; Dai, Xiaohui; Pan, Jianming

    Organizations: National Natural Science Foun-dation of China [51803080, 21822807]; State Key Laboratory of Efficient Utilization for Low Grade Phosphate Rock and Its Associated Resources [WFKF2020-03]

    Keywords: Ion imprinted membrane; Rare earth separation; Aqueous phase imprinting; Hydrophilic additive; Ligand confinement

    Molecular imprinting technology has been proved an efficient strategy for separation, however ion imprinting was not so high-performance. Pure aqueous phase synthesis and ligand assistance are two prominent improvement strategies so far. This article developed a novel rare earth yttrium(Y) ion imprinted membrane (Y-IIM) in pure aqueous phase, and applied a high-performance rare earth extractant Cyanex272 as ligand in membrane basement to confine the imprinted polymerization process. Firstly, polymer inclusion membrane (PIM) containing copolymer poly(vinyl alcohol-co-ethylene) as hydrophilic additive and Cyanex272 as interior ion ligand was synthesized. Then ion imprinting in aqueous phase was initiated through redox polymerization. Results confirmed that Y-IIMs performed superior hydrophility and Cyanex272 presented improved thermal stability. Imprinted aggregates distributed separately on membrane surfaces and inner walls, as a result of the confinement by the coordination between Y and Cyanex272 ligand. The adsorption capacity on Y was 3 times that of non imprinted membranes, and the Y-IIMs exhibited superior permeation ability for Y than Ho and Er, indicating the realization of expected specific recognition affinity for Y through ligand confinement and aqueous medium synthesis.
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