膜科学与技术

氟化PDMS/PVDF双疏膜的制备及其在膜蒸馏中的应用

作者：张学励，李保安

单位： 1. 天津大学化工学院，天津 300350；2. 天津化学化工协同创新中心，天津 300072；3. 化学工程联合国家重点实验室(天津大学)，天津 300072；

关键词：聚二甲基硅氧烷；氟硅烷；超疏水疏油；膜蒸馏；膜污染

出版年,卷(期):页码： 2021,41(1):102-111

摘要：

膜蒸馏(MD)是一种能够利用低品位能源的新型脱盐技术，但迄今为止仍然没达到规模化应用的阶段，其主要原因是缺乏具有抗污染性的膜材料。通过表面改性提高膜的超疏水性是解决膜污染问题的有效方法。采用浸涂法，以聚二甲基硅氧烷(PDMS)、正硅酸乙酯(TEOS)和二月桂酸二丁基锡(DBTDL)等为原料活化PVDF膜表面，然后接枝1H,1H,2H,2H-全氟癸基三乙氧基硅烷(AC-FAS)制备双疏膜。其水、油接触角分别达161.3°和134.9°，并且具有良好的热稳定性和化学稳定性。在直接接触式膜蒸馏(DCMD)实验中，具有较高的膜通量、良好的脱盐性能以及优异的抗综合膜污染的能力。

Membrane distillation (MD), as a new desalting technology, can utilize low grade energy. However, large-scale application based on membrane distillation has not been widely used. One of the important reasons is the lack of membrane with good anti-fouling property. Therefore, it is of critical importance to prepare amphiphobic membrane to improve the anti-fouling property. A functional layer was formed on the PVDF membrane surface by using polydimethylsiloxane (PDMS), tetraethoxysilane (TEOS) and dibutyltin dilaurate (DBTDL). Next, the surface was fluorinated with 1H,1H,2H,2H-perfluorodecyltriethoxysilane to obtain amphiphobic membrane. The contact angles of water and oil reached 161.3° and 134.9° respectively, showing obvious superhydrophobic and oleophobic properties. In addition, the amphiphobic membrane still shares good stability under harsh conditions. The long-term direct contact membrane distillation (DCMD) experiment shows outstanding comprehensive anti-fouling capacity with higher flux and excellent salt rejection.

张学励( 1992- )，男，浙江宁波人，硕士研究生，膜蒸馏材料表面改性

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