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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(2 077±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。
Using microporous polypropylene microporous membrane (MPPM) as support, the photoinitiator was immobilized by physical embedding and UV-induced covalent bonding, and then the ion-imprinted composite membrane was obtained by UV-induced graft copolymerization. The effects of preparation conditions on the graft amount of ionomer were investigated. The distribution of the surface of the composite membrane and the cross-section ionomer were analyzed by scanning electron microscopy (SEM) and energy dispersive X-ray spectrometer (EDX). The experimental results of static water contact angle and pure water flux show that the ion-imprinted composite membrane has good surface hydrophilicity and permeability, and the pure water flux can reach (2077 ± 77) L / (m2.h). Regenerative studies show that the ion-imprinted composite membrane has good regeneration performance. After 10 cycles of adsorption-desorption, the adsorption capacity and selectivity of Pb (Ⅱ) membrane can be maintained at 90% and 80%, respectively.