膜科学与技术

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An anti-fouling and self-cleaning thermo-responsive membrane for emulsified oil-water separation

Authors： JING Lanxi, XIE Rui, JU Xiaojie, WANG Wei, LIU Zhuang, PAN Dawei, CHU Liangyin

Units： School of Chemical Engineering, Sichuan University, Chengdu 610065

KeyWords： Honeycomb-like structure; Emulsified oil-water separation; Thermo-responsive membrane; Anti-fouling; Self-cleaning

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2023,43(5):1-11

Abstract：

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.

Funds：

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

AuthorIntro：

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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