膜科学与技术

一种抗污染/自清洁的双向油水乳液分离温敏膜

作者：井兰溪，谢锐，巨晓洁，汪伟，刘壮，潘大伟，褚良银

单位：四川大学化学工程学院，成都 610065

关键词：蜂窝状结构；油水乳液分离；温敏膜；抗污染；自清洁

出版年,卷(期):页码： 2023,43(5):1-11

摘要：

以聚偏氟乙烯（PVDF）为基膜，通过原位聚合和蒸气诱导相分离法（VIPS）引入亲水聚N-异丙基丙烯酰胺（PNIPAM）和聚甲基丙烯酸羟乙酯（PHEMA），成功制备了一种抗污染/自清洁的双向油水乳液分离温敏膜。系统研究了单体质量比对膜微观结构、化学成分、表面浸润性、油水分离性能的影响，以牛血清白蛋白（BSA）为模型蛋白分子考察了膜的抗污染性能及自清洁性能。结果表明，当单体质量比为2.5: 0.5时，膜表面呈现出均匀的蜂窝状微纳米结构，表现出优异的双亲/液下超双疏性，水下油接触角和油下水接触角分别为151.1º和152.8º，对水包大豆油和大豆油包水乳液的渗透率分别为3258.4 L/(m2·h·bar)和108.3 L/(m2·h·bar)，分离效率均在99.55%以上。其在20 ºC和50 ºC下对1 g/L的BSA溶液的静态吸附量仅为35.8 μg/cm2，通过交替使用50 ºC/20 ºC纯水对污染的膜进行清洁，其通量恢复率和不可逆污染率分别为99.0%和1.0%。上述研究结果为抗污染/自清洁双向油水乳液分离膜的创新设计和制备提供了新思路。

An anti-fouling and self-cleaning thermo-responsive membrane is successfully prepared for emulsified oil-water separation by introducing hydrophilic poly(N-isopropylacrylamide) (PNIPAM) and polyhydroxyethyl methacrylate (PHEMA) into membrane matrix polyvinylidene fluoride (PVDF) via in situ polymerization and vapor-induced phase separation (VIPS). The effects of the monomer mass ratio on the microstructure, chemical composition, surface wettability and oil-water separation performance of the thermo-responsive membranes are systematically investigated, and their anti-fouling and self-cleaning performances against model protein molecules bovine serum albumin (BSA) are examined. The results show that when the mass ratio is 2.5: 0.5, the membrane surface is provided with uniform honeycomb micro/nanostructures and excellent amphiphilic/dual superlyophobic characteristics; the oil underwater contact angle and water underoil contact angle of such a membrane are 151.1º and 152.8º, respectively; the separation permeabilities of soybean oil-in-water and water-in-soybean oil emulsions are 3258.4 L/(m2·h·bar) and 108.3 L/(m2·h·bar), respectively, with separation efficiencies are both above 99.55%. The static adsorption contents of 1 g/L BSA solution at 20 ºC and 50 ºC are merely 35.8 μg/cm2, and the flux recovery and irreversible fouling rate are 99.0% and 1.0%, respectively, by alternative cleaning the fouling membranes with purified water at 50 ºC/20 ºC. The above-mentioned results provide a new strategy for the design and construction of the anti-fouling and self-cleaning membrane for emulsified oil-water separation.

井兰溪（1998-），女，陕西渭南人，硕士研究生，研究方向为膜材料与膜过程，E-mail: jinglanxi@stu.scu.edu.cn

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