膜科学与技术

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Polyvinyliene fluoride composite membrane with high wettability constructed by substrate and its oil-water separation performances

Authors： QIN Jiawang, XIE Rui, JU Xiaojie, WANG Wei, LIU Zhuang, CHU Liangyin

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

KeyWords： Vapor-induced phase separation; Polyvinylidene fluoride, Substrate, Underoil super-hydrophobicity, Oil-water separation

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(5):26-34

Abstract：

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.

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：

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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