膜科学与技术

支撑层强化聚偏氟乙烯复合膜的表面浸润性及油水分离性能研究

作者：秦佳旺，谢锐，巨晓洁，汪伟，刘壮，褚良银

单位：四川大学化学工程学院，成都 610065

关键词：蒸气诱导相分离；聚偏氟乙烯；支撑层；油下超疏水；油水分离

出版年,卷(期):页码： 2021,41(5):26-34

摘要：

在蒸气诱导相分离（VIPS）过程中，以无纺布（NWF）为支撑层调节聚偏氟乙烯（PVDF）膜下表面的微纳结构，成功制备了可高效分离油包水乳液的PVDF/NWF复合膜。系统研究了暴露时间对复合膜的微观结构与表面浸润性的调控规律，利用扫描电镜、接触角测量仪、衰减全反射红外光谱仪、水分滴定仪等表征了复合膜的微观结构、表面浸润性、化学组成和油水分离性能。结果表明，当暴露时间为1 min时，复合膜孔径为5.723 μm，下表面空气中水接触角为123.4º，油下水接触角为151.0º。其对搅拌时间不低于0.5 h或分散相含量不高于2%的正十六烷包水乳液的分离通量均高于17000 kg/(m2·h?MPa)，最高分离效率可达99.9%。复合膜在三次连续油水分离循环后，其分离效率保持在92.0%以上，具有良好的稳定性。上述研究结果为高效油水分离膜的设计和制备提供了一种新思路。

During the vapor-induced phase separation (VIPS) process, the non-woven fabrics (NWF) are introduced as substrates to construct micro/nano-structure on bottom surface of polyvinylidene fluoride (PVDF) membranes, and the PVDF/NWF composite membranes for efficient separation of water-in-oil emulsion are successfully prepared. The principle between the microstructure as well as surface wettability of composite membranes and exposure time in the water vapor atmosphere are systematically studied. The microstructure, surface wettability, chemical composition and oil-water separation performance of composite membranes are investigated by means of Scanning Electron Microscope, Contact Angle measuring instrument, Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy and Moisture Titration Instrument, respectively. The results show that the composite membrane prepared by exposure time of 1 min have pore size of 5.723 μm, showing water contact angle in air and under oil water contact angle are 123.4º and 151.0º, respectively. The flux of composite membranes for water-in-hexadecane emulsion that stirring time not less than 0.5 h or water content not higher than 2% is higher than 17000 kg/(m2?h?MPa), and the highest efficiency reaches 99.9%. The separation efficiency of this membrane remains 92.0% or above after three successive separation cycles, exhibiting excellent stability. These results provide a new strategy for design and development of membrane for high efficient oil-water separation.

秦佳旺（1996-），男，辽宁抚顺人，硕士研究生，膜材料与膜过程，E-mail: jwqin@stu.scu.edu.cn

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