膜科学与技术

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Preparation of pH and temperature-responsive microgel composite membrane and its oil-water separation performance

Authors： Chen Fuyou, Zhao Yawen, Ma Hui, GaoCongjie, Lu Yeqiang，XUE Lixin

Units： 1 Center for Membrane Separation and Water Science & Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang Province, 310014, China; 2 College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang Province, 325035, China

KeyWords： stimuli response; microgel; oil-water separation; self-cleaning

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2023,43(5):106-117

Abstract：

Smart switchable stimuli-responsive membrane materials with wettability under external energy stimulation have attracted much attention for on-demand oil-water separation. Here, by adding a P-PDA microgel with pH and temperature dual stimuli responses to polyvinylidene fluoride (PVDF) casting solution, a microgel composite membrane (M2) with dual stimuli responsiveness to pH and temperature was prepared by phase inversion using ethanol as a coagulation bath. The influence and mechanism of different temperature and pH on the wetting properties of the membrane surface were investigated, and the self-cleaning performance of the membrane and its separation performance for different types of oil-water emulsions were explored. The study found that M2 membrane exhibited high hydrophobicity (147.2°) and superoleophilicity (0°) in air. At pH=7, the water contact angle of the membrane increaseed continuously with the increase of temperature, and a significant change was observed in the range of 30-35℃, and the water contact angle increaseed from 149.3° to 153.5°. When the membrane was pretreated with pH=13 water, the high hydrophobicity and superoleophilicity in air were transformed into hydrophilic and under-water superoleophobic. Due to the switchable wettability of M2 membrane, the effective separation of W/O and O/W emulsions were successfully achieved only under gravity drive, with separation efficiencies greater than 98.5% and excellent self-cleaning performance.

Funds：

国家自然科学基金（NSFC-U1809213, NSFC-52203104）和浙江省自然科学基金（LQ21B040002）

AuthorIntro：

陈富有（1997-），男，籍贯：江西省赣州市，研究方向为膜科学与技术。E-mail：1549846105@qq.com

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