紫外光诱导接枝共聚制备离子识别性聚丙烯微孔膜

Preparation of Ion Recognition Microporous Polypropylene Membrane via UV-induced Graft Copolymerization

摘要:

以聚丙烯微孔膜(MPPM)为支撑，采用物理包埋和紫外光诱导共价键合组合法固定光引发剂，再通过紫外光诱导接枝共聚制得离子印迹复合膜。考察了制备条件对离子印迹聚合物接枝量的影响，并用扫描电子显微镜(SEM)-能量色散X射线光谱仪(EDX)对复合膜表面及截面离子印迹聚合物的分布进行了分析。静态水接触角和纯水通量实验结果显示，离子印迹复合膜具有良好的表面亲水性和渗透性，纯水通量可达2077  77 L/m2h。再生性研究表明，离子印迹复合膜具有良好的再生性能，10次吸附-脱吸附循环后，膜对Pb(II)的吸附量和选择性系数分别能维持在90%和80%以上。

Abstract:

An ion-imprinted composite membrane using microporous polypropylene An ion-imprinted composite membrane, with microporous polypropylene membrane (MPPM) as support, was prepared by a modified UV-induced graft copolymerization. In the graft strategy, photoinitiators were immobilized on the surface of MPPM by combining the physical entrapment and UV-induced covalent immobilization methods. The effects of preparation conditions on grafting amount of ion-imprinted polymer were discussed. The distributions of ion-imprinted polymer on the surface and cross-sectional of the composite membrane were analyzed by field emission scanning electron microscopy-energy dispersive X-ray spectroscopy (FESEM-EDX). Static water contact angle and pure water flux measurements were also conducted. Results show that the imprinted composite membranes have satisfactory surface hydrophilicity and penetrability, and the pure water flux is up to 2077  77 L/m2h. The regeneration experiments indicate that, the ion-imprinted composite membranes have favorable regeneration performances. After ten adsorption-desorption cycles, adsorption capacity and selectivity coefficients of the ion-imprinted composite membranes can maintain more than 90% and 80%, respectively.