Janus poly(vinylidene fluoride)-graft-(TiO2 nanoparticles and PFDS) membranes with loose architecture and asymmetric wettability for efficient switchable separation of surfactant-stabilized oil/water emulsions
Journal of Membrane Science(2021)
摘要
Janus membranes, with extremely asymmetric wettability, superior flux and rejection, facile fabrication route, and versatile in complex environment, is urgently needed in fields of ideal oil/water separation. In this work, a facile poly (vinylidene fluoride)-graft-(TiO2 nanoparticles and 1H, 1H, 2H, 2H-perfluorodecyltri-ethoxysilane) (PVDF-g-(TiO2-PFDS)) membrane with loose architecture and asymmetric wettability was successfully fabricated by one-step surface grafting and further single-side chemical vapor deposition (CVD) strategies. Amino-functionalized TiO2 (TiO2–NH2) nanoparticles immobilized could not only improve surface energy and roughness of the PVDF-g-poly(acrylic acid) (PAA) membrane, but also decrease pore size adequately. PFDS was further deposited on one side of PVDF-g-TiO2 NPs membrane for constructing asymmetric interface. The fabricated Janus membrane showed superhydrophilic (a water contact angle of 0°) and superhydrophobic (a stable water contact angle of 151°) properties on forward/reverse surfaces. These characteristics endowed the membrane with high separation flux of ∼2500 L·m-2·h-1 under 0.1 MPa, and high rejection rate of above 99.70% for separating surfactant-stabilized dodecane-in-water and water-in-chloroform emulsions, respectively. Furthermore, the PVDF-g-(TiO2-PFDS) membrane showed excellent cycling performance during separation process. This work shows a potential way to fabricate Janus membranes with dual wettability for efficient oil/water separation facilely.
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关键词
Janus membranes,Surface grafting strategy,Chemical vapor deposition,Efficient oil/water separation
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