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电中性纳滤膜的制备及其染料脱盐和抗污染性能研究

作者：郭灵艺，谢锐，巨晓洁，汪伟，刘壮，褚良银

单位：四川大学化学工程学院 ,成都 610065

关键词：两性离子液体；电中性；纳滤膜；染料脱盐；抗污染

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2022,42(6):134-143

摘要：

以硫酸铜/过氧化氢（CuSO4/H2O2）为触发剂，利用多巴胺（DA）辅助磺酸基甜菜碱（SBMA）和聚乙烯亚胺（PEI）快速沉积改性聚丙烯腈（PAN）超滤膜制备了具有电中性表面的纳滤膜（PAN-DPS）。系统研究了SBMA和PEI的投料比对PAN-DPS膜的微观结构、化学组成、表面浸润性和荷电性的影响，并考察了膜的染料/盐分离及抗牛血清白蛋白（BSA）污染性能。结果表明，投料比为10：1的纳滤膜表面沉积了最多的DA和SBMA聚集体，功能层厚度高达636 nm，表面水接触角低至33.2º，等电点约为pH 7.2。其纯水渗透率为15.6 L/(m2·h·bar)，对甲基蓝的截留率为99.2%，对NaCl、Na2SO4和MgCl2的截留率分别为3.4%、5.4%和8.5%。在1 mg/mL的BSA溶液中的静态吸附量为7.0 µg/cm2，过滤BSA溶液3次后的纯水恢复率仍能够达到88.5%，表现出良好的染料脱盐和抗污染性能。上述研究结果为抗污染的染料脱盐纳滤膜的制备提供了一种新思路。

The nanofiltration membranes with electroneutral surfaces (PAN-DPS) were prepared by dopamine(DA)-assisted fast-deposition of sulfobetaine methacrylate (SBMA) and polyethyleneimine (PEI) on polyacrylonitrile (PAN) ultrafiltration membranes using copper sulfate/hydrogen peroxide (CuSO4/H2O2) as triggers. The effects of the feeding ratio of SBMA and PEI on the microstructure, chemical composition, surface wettability and charge properties of PAN-DPS membranes were systematically investigated, and the dye/salt separation and anti-fouling performance toward bovine serum albumin (BSA) of the membranes were examined. The results showed that the membrane prepared by the feeding ratio of 10:1, whose surface coated with the maximal amount of DA and SBMA aggregates, was provided with a functional layer thickness of 636 nm, a surface water contact angle of 33.2º, and an isoelectric point of about pH 7.2. The pure water flux across the membrane was 15.6 L/(m2·h·bar), the rejection of methyl blue was 99.2%, and the rejection of NaCl, Na2SO4 and MgCl2 were 3.4%, 5.4% and 8.5%, respectively. The static adsorption amount of BSA on this membrane in 1 mg/mL BSA solution was 7.0 µg/cm2, and the flux recovery ratio reached 88.5% after filtering the BSA solution for three times. The membrane exhibited a satisfactory dye desalination and anti-fouling properties. The results provide a new idea for the study of fabrication of anti-fouling nanofiltration membrane for dye desalination.

基金项目：

国家自然科学基金项目(22078205);四川省杰出青年科技人才项目(2019JDJQ0026)

作者简介：

郭灵艺(1996-),男 ,四川自贡人 ,硕士生 ,研究方向为膜材料与膜过程

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