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    Fabrication of crosslinking modified PVDF/GO membrane with acid, alkali and salt resistance for efficient oil-water emulsion separation

    Year: 2021

    Journal: Sep. Purif. Technol., Volume 265, JUN 15

    Authors: Cui, Jiuyun; Xie, Atian; Yan, Zhuo; Yan, Yongsheng

    Organizations: Introduction of Talent Research Startup Fund of Anhui University of Science and Technology [13200405]; Natural Science Research Projects of Anhui Universities [KJ2020A0305]

    Keywords: Crosslinking; Acid; alkali and salt resistance; Composite membrane; Superhydrophilicity; Oil-water emulsion separation

    Although a great deal of superhydrophilic/underwater superoleophobic membranes has been developing for oilwater emulsion separation, most of them could be destroyed or lose their underwater superoleophobicity after exposure to complex conditions. In this study, a crosslinking modified PVDF/GO membrane with acid, alkali and high salt resistance was successfully prepared by a simple crosslinking process between acrylic acid and ethylene glycol dimethacrylate (EGDMA). The influences of content of acrylic acid on the membrane performance and structure evolution were investigated. The resultant composite membrane showed superior underwater superoleophobicity even in acid, alkali and salt environments. Additionally, the composite membrane could effectively separate various surfactant-stabilize emulsions under gravity-driven via wettability capillary effect with high rejection (>99%) and flux (>145 L m- 2 h-1). The composite membrane also exhibited outstanding recyclability because of the stable covalent bridged multiple networks structure. The antifouling performance, stability and impressive recyclability make the composite membrane a promising candidate for long-term oil-water emulsion treatment.
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