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Amphiphobic PFTMS@nano-SiO2/ePTFE Membrane for Oil Aerosol Removal

Xu, Chong, Fang, Jian, Low, Ze-Xian, Feng, Shasha, Hu, Min, Zhong, Zhaoxiang, Xing, Weihong
Industrial & engineering chemistry process design and development 2018 v.57 no.31 pp. 10431-10438
aerosols, air, cleaning, coatings, cost effectiveness, dust, filtration, oils, permeability, polytetrafluoroethylene, process design
Synthetic expanded polytetrafluoroethylene (ePTFE) membrane has a wide range of applications, including aerosol and dust removal, and exhibits high dust-removing efficiency, high air permeability, and cost-effectiveness. However, the intrinsic oleophilic surface of ePTFE limits its application in the oil-bearing gas–solid separation process. Herein, we report a surface modification method to prepare amphiphobic ePTFE membranes via coating of a layer of 1H,1H,2H,2H-perfluorooctyltrimethoxysilane (PFTMS) – modified nano-SiO₂ onto the surface of ePTFE fibers. The oil contact angle of the modified ePTFE membranes was increased from 0 to 123°, while retaining the initial water contact angle of 142°. The amphiphobic membrane shows excellent oil aerosol filtration efficiency with a comparative low pressure drop and high oil rejection rate of 99.5%. Remarkably, the membrane can be reused after simple rinsing with water. The oil aerosol filtration efficiency of membrane remained as high as 98.5% after five cycles of filtration and cleaning.