膜科学与技术

PA/PMIA复合纳滤膜的制备及性能研究

作者：张冉，王磊，司会芳，李琳，王华，王同华

单位： 1. 大连理工大学化工学院精细化工国家重点实验室大连市膜材料与膜过程重点实验室炭素材料研究室炭膜及多孔材料课题组，辽宁大连 116024；2. 大连理工大学体育与健康学院，辽宁大连 116024

关键词：聚间苯二甲酰间苯二胺；界面聚合；纳滤膜；聚酰胺

出版年,卷(期):页码： 2023,43(4):129-135

摘要：

以聚间苯二甲酰间苯二胺（PMIA）为膜材料，LiCl和H2O为添加剂，N,N-二甲基乙酰胺（DMAc）为溶剂，通过相转化法制备PMIA超滤基膜。以哌嗪（PIP）为水相单体，均苯三甲酰氯（TMC）为油相单体，通过界面聚合法制备PA/PMIA复合纳滤膜。考察了单体浓度对复合纳滤膜渗透分离性能的影响，当单体浓度增加时，复合纳滤膜的水通量下降，Na2SO4的截留率增大；水相单体PIP浓度为0.5wt.%，油相单体TMC浓度为0.07wt.%，反应时间为30s，后处理温度为70℃，后处理时间为3min时，所制备的PA/PMIA复合纳滤膜的水通量为50.89L/（m2•h•bar），Na2SO4截留率为98.24%，酰胺（PA）层厚度为40nm，接触角为44°；PA/PMIA复合纳滤膜在有机溶剂和酸碱中浸泡30d后，仍保持稳定的Na2SO4截留率。

PMIA ultrafiltration basement membrane was prepared by phase conversion using polyisophthaloyl-m-phenylenediamine (PMIA) as membrane material, LiCl and H2O as non-solvent additives, and N,N-dimethylacetamide (DMAc) as solvent. PA/PMIA composite nanofiltration membrane was prepared by interfacial polymerization with piperazine (PIP) as aqueous monomer and benzenetricarbonyl chloride (TMC) as oil-phase monomer. The effect of monomer concentration on the permeation and separation performance of composite nanofiltration membrane was investigated, and when the monomer concentration increased, the water flux of the membrane decreased and the interception rate of Na2SO4 increased. When the concentration of aqueous monomer PIP was 0.5wt.%, the concentration of TMC of oil-phase monomer was 0.07wt.%, the reaction time was 30s, the post-treatment temperature was 70°C, and the post-treatment time was 3min, The water flux of the prepared PA/PMIA composite nanofiltration membrane was 50.89L/(m2•h•bar), the retention rate of Na2SO4 was 98.24%, the thickness of amide (PA) layer was 40nm, and the contact angle was 44°. The PA/PMIA composite nanofiltration membrane had stable Na2SO4 retention after 30 days immersion in organic solvents and acids and bases.

张冉（1998.06.10），女，湖北省孝感市，硕士研究生，复合纳滤膜孔结构调控，E-mail：zhangran123@mail.dlut.edu.cn

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