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基于PIP-DEA-TMC界面聚合体系制备内压式中空纤维复合纳滤膜

作者：杨林涛¹，²，康国栋²，于海军²，李韵浩²，刘明¹，曹义鸣²

单位： 1. 大连交通大学材料科学与工程学院，大连 116028； 2. 中国科学院大连化学物理研究所，大连 116023

关键词：界面聚合；二乙醇胺；内压式中空纤维纳滤膜

DOI号： 10.16159/j.cnki.issn1007-8924.2026.01.006

分类号： TQ028.8

出版年,卷(期):页码： 2026,46(1):56-66

摘要：

采用非溶剂致相分离法（NIPS）制备了聚醚砜（PESU）中空纤维底膜,并选择哌嗪（PIP）和具有良好亲水性的二乙醇胺（DEA）作为水相单体，与均苯三酰氯（TMC）通过界面聚合（IP）在PESU底膜内表面形成聚酰胺分离层。利用ATR-FTIR、XPS、SEM、Zeta电位测定仪和水接触角测定仪对膜进行表征，并考察水相中DEA含量对纳滤膜分离性能的影响。结果表明，DEA成功引入聚酰胺分离层中，随着其比例的提高，聚酰胺分离层的表面形貌发生显著改变；分离层厚度减小，膜表面所带负电荷减少；亲水性和水通量提升。最佳水相组成为：DEA质量分数为1.2%，PIP质量分数为0.8%，此时纯水通量为67.0 L/(m2·h),达到未加入DEA膜的1.74倍，截留分子量（MWCO）为1 605 Da，其对Na2SO4、MgSO4、MgCl2和NaCl的截留率分别为91.2%、86.4%、38.1%、25.4%，160 h连续过滤测试显示膜性能稳定。

Polyethersulfone (PESU) hollow fiber substrate membranes were prepared via non-solvent induced phase separation (NIPS). Piperazine (PIP) and diethanolamine (DEA), which exhibits good hydrophilicity, were selected as aqueous phase monomers to form a polyamide separation layer on the inner surface of the PESU substrate membrane through interfacial polymerization (IP) with trimesoyl chloride (TMC). The hollow fiber nanofiltration membranes were characterized using ATR-FTIR, XPS, SEM, Zeta potential analyzer and water contact angle meter. The effect of DEA content in the aqueous phase on the separation performance of the nanofiltration membranes was investigated. The results showed that DEA was successfully introduced into the polyamide separation layer. With the increase of DEA proportion, the surface morphology of the polyamide separation layer changed significantly; the thickness of the separation layer decreased, the negative charge on the membrane surface was reduced; while the hydrophilicity and water flux improved. The optimal aqueous phase composition was determined as follows: DEA mass fraction of 1.2% and PIP mass fraction of 0.8%. Under this condition, the pure water flux was 67.0 L/(m2·h), which was 1.74 times that of the membrane without DEA addition. The molecular weight cut-off (MWCO) was 1 605 Da, and the rejection rates for Na2SO4, MgSO4, MgCl2 and NaCl were 91.2%, 86.4%, 38.1% and 25.4%, respectively. A 160-hour continuous filtration test showed that the membrane performance was stable.

基金项目：

辽宁省自然科学基金计划博士科研启动项目（2024-BSBA-33）

作者简介：

杨林涛（2000-），男，贵州铜仁人，硕士研究生，主要研究方向为膜分离技术.

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