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Preparation of hydrophobic PTFE/ceramic composite membranes with
narrow pore size distribution by polymer sintering method

Authors： SUN Wei1,2, LIU Pei1, LI Wenrui1, CHEN Xianfu1, QIU Minghui1, FAN Yiqun1

Units： 1. State Key Laboratory of Materials Chemistry Engineering ，College of Chemical Engineering, Nanjing Tech University， Nanjing 211816，China； 2. Qingyuan Innovation Laboratory，Quanzhou 362801，China

KeyWords： PTFE; particle stacking; ceramic membrane; hydrophobicity; soybean oil dehydration

ClassificationCode：TQ174

year,volume(issue):pagination： 2025,45(4):43-52

Abstract：

Porous hydrophobic membrane materials hold significant value in applications such as oil purification and high-salinity wastewater treatment. Polytetrafluoroethylene (PTFE) membranes are known for their excellent hydrophobicity and stability. However, achieving uniform pore structures remains a persistent challenge in the industry. This study proposes a method for fabricating PTFE membrane layers on the surface of macroporous ceramic supports using a polymer sintering approach. A systematic investigation was conducted on the effects of nonionic surfactants, specifically fatty alcohol polyoxyethylene ether and polyvinyl alcohol, on the dispersion and stability of PTFE micropowder. Furthermore, the study examined how PTFE coating thickness influenced the composite membrane’s surface morphology, as well as the impact of filtration pressure on the microstructure of the membrane layer. The optimized PTFE/ceramic membrane achieved an average pore size of approximately 370 nm, a membrane thickness of about 19 μm, and a water contact angle of roughly 152°. When applied to soybean oil dehydration, the membrane demonstrated an oil flux of 35 L/（m2·h） at an oil-to-water ratio of 5∶1 and the operating temperature was 45 ℃, with a water removal efficiency exceeding 99%. These results highlight the membrane’s promising potential for practical applications.

Funds：

国家重点研发计划项目（2022YFB3805001）；清源创新实验室重大项目（00122003）；吉安市“揭榜挂帅”项目（pzzy-wtht-20220117014）

AuthorIntro：

孙薇（1999-），女，江苏连云港人，硕士研究生，从事分离膜的制备与应用研究

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