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HPW@MIL-101掺杂的混合基质膜制备及其离子分离性能研究

作者：王鑫，陆俊其，葛亮，徐铜文

单位：中国科学技术大学化学与材料科学学院，合肥 230026

关键词：金属有机骨架（MOFs）；磷钨酸；混合基质膜；电渗析；离子分离

DOI号：

分类号： O69

出版年,卷(期):页码： 2020,40(1):100-109

摘要：

金属有机骨架因其大的孔隙率，高比表面积以及可调节的孔径等特点广泛地用于分离应用研究。杂多酸具有较大的分子半径，较强的亲水性以及强酸性，是一种良好的质子转移与储存材料。本文通过简单的一锅法将磷钨酸（HPW）引入到MIL-101空腔中，合成出不同含量HPW填充型HPW@MIL-101并通过与磺化聚苯醚/聚乙烯醇（SPVA）共混制备出混合基质膜。考察了HPW@MIL-101在SPVA中的稳定性和分散性并系统地探究了不同HPW含量的HPW@ MIL-101对H+传输及H+/Fe2+分离性能的影响。结果表明，HPW@MIL-101/SPVA混合基质膜显示出优异的H+/Fe2+分离性能，并且随着HPW含量的增加，H+通量和离子分离性能都逐渐上升。其中HWS-3混合基质膜的 H+通量达到1.2710-6 mol/(cm2·s)，H+/Fe2+选择性分离性能也高达210。

Metal-organic frameworks are widely used for separation applications due to its large porosity, high specific surface area and tunable pore size. Heteropoly acid is a kind of ideal material for proton transfer and storage because of its large molecular radius, strong hydrophilicity and super acidity. In this context, we report a facile one-pot solvothermal synthesis strategy to fabricate a series new nanocomposites by filling different content of phosphotungstic acid (HPW) in the cavity of MIL-101 (HPW@MIL-101). We further immobilized HPW@ MIL-101 nanocomposites in SPPO/PVA composite membranes to fabricate the mixed matrix membranes. The stability and dispersion of HPW@MIL-101 in SPVA were investigated. In addition, the effects of HPW@MIL-101 with different content of HPW on H+ transport and H+/Fe2+ separation properties were systematically discussed. Specifically, with the increase of HPW content, the ion permeation fluxes of H+ and H+/Fe2+ permselectivity obviously increased. The resulting representative HWS-3 membrane offers excellent H+ permeation (1.27 10-6 mol/(cm2·s) )and impressive H+/Fe2+ selectivity (＞210).

基金项目：

国家自然科学基金项目(21490581，91534203，21878282)

作者简介：

第一作者简介：王鑫(1995-)，陕西西安人，硕士生，从事MOFs分离膜制备及离子分离性能研究，E-mail：wx246@mail.ustc,.edu.cn *通讯作者，E-mail：geliang@ustc.edu.cn; twxu@ustc.edu.cn

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