李明迪,孙星,王斌,孙羽,徐佳

• 1:中国海洋大学化学化工学院

摘要(Abstract)：

本文分别以哌嗪(Piperazine, PIP)和对苯二甲酰氯(Terephthaloyl chloride, TPC)为水相单体和有机相单体，通过界面聚合法制备PIP-TPC皮层，获得了PIP-TPC纳滤膜。与构建PIP-TMC皮层的三维网状链结构不同，PIP-TPC皮层是由线性PIP-TPC聚合物交织而成。主要考察了TPC浓度对膜分离性能的影响，实验证明该膜兼具优异的二价/一价阴离子选择性和良好的水通量。在最佳制备条件下，该膜对二价盐(Na_2SO_4)截留率达到98.2%,对一价盐(NaCl)截留率仅为13.1%,Na_2SO_4/NaCl选择性为7.5;与商品化PIP-TMC纳滤膜相比，在保持Na_2SO_4截留率的同时，NaCl截留率降低了20.4%,因此选择性提高了158.6%。这主要归功于二元胺和二元酰氯生成的线性聚合物链间相互交织缠绕，构建了具有略大孔径尺寸的PIP-TPC皮层(平均孔径0.369 nm),既促进了NaCl的透过，又可有效截留Na_2SO_4;同时，与TMC相比，TPC含有较少酰氯基团，导致PIP-TPC膜表面羧基含量较低，降低了膜表面荷负电性，对Cl~-的道南排斥效应减弱，有利于降低NaCl截留率，从而提高了二价/一价阴离子选择性。

关键词(KeyWords)： 纳滤膜;分盐;对苯二甲酰氯;界面聚合;盐选择性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(911922270);; 山东省自然科学基金项目(911862340)资助~~

作者(Author): 李明迪,孙星,王斌,孙羽,徐佳

DOI: 10.16441/j.cnki.hdxb.20210448

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