Preparation and properties of polyvinylidene fluoride amphiphobic membrane for membrane disillation
When treating complex liquid solutions containing surfactants using membrane distillation,conventional hydrophobic membranes are prone to wetting and contamination issues.Currently,multilevel re-entrant surface amphiphobic membranes have garnered widespread attention.This paper proposes a novel polyvinylidene fluoride(PVDF)amphiphobic membranes without multilevel re-entrant surface.Initially,PVDF and styrene-maleic anhydride copolymer(SMA)blended pristine membranes were prepared using a composite phase transformation method,followed by grafting of low surface energy perfluorodecyl-triethoxysilane(17-FAS)to produce the amphiphobic membranes.The contact angles of water and ethylene glycol on the top and bottom surfaces of the membrane were measured at 135.9°,147.3°,112.2°,and 123.5°,respectively.The membrane exhibited excellent liquid entry pressures(LEP)exceeding 0.4 MPa in saline solutions containing surfactants and organic pollutants.Direct contact membrane distillation was employed to process complex liquid solutions containing salt,the surfactant sodium dodecyl sulfate(SDS),and organic pollutants such as fulvic acid(FA)or humic acid(HA).The results demonstrated that the PVDF amphiphobic membrane achieved a water flux of 36 kg/(m2·h)and a salt rejection rate of 99.9％,exhibiting excellent anti-wetting and anti-fouling properties.
万方数据
维普
