膜科学与技术

pH和温度双响应性的微凝胶复合膜的制备及油水分离性能研究

作者：陈富有，赵雅雯，马慧，高从堦，陆叶强，薛立新

单位： 1浙江工业大学化工学院膜分离与水科学技术中心，浙江，杭州 310014； 2温州大学化学与材料工程学院，浙江，温州 325035

关键词：刺激响应；微凝胶；油水分离；自清洁

出版年,卷(期):页码： 2023,43(5):106-117

摘要：

在外部能量刺激下具有浸润性智能可切换的刺激响应膜材料在按需油水分离方面备受关注。在此，我们通过向聚偏氟乙烯（PVDF）铸膜液中加入一种具有pH和温度双刺激响应的P-PDA微凝胶，接着采用乙醇作为凝固浴通过相转化的方式制备出了一种具有pH和温度双刺激响应性的微凝胶复合膜（M2），并考察了不同温度和pH对膜表面浸润性能的影响及机理，同时探究了膜的自清洁性能及其对不同类型的油水乳液的分离性能。研究发现，M2膜在空气中表现出高疏水性（147.2°）和超亲油性（0°）。在pH=7时，随着温度的升高，膜的水接触角不断增加，并且在30-35℃区间内观察到明显的变化，水接触角从149.3°上升到153.5°。当膜被pH=13水预处理后，空气中的高疏水性和超亲油性转变为亲水性和水下超疏油性。由于M2膜具有可切换的浸润性，仅在重力驱动下成功实现了对W/O和O/W乳液的有效分离，分离效率均大于98.5%，且具有优异的自清洁性能。

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.

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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