Preparation and Properties of PVDF/GO-ZnO Photocatalytic Composite Flat Membranes
To effectively solve the problem of difficult recovery of nanocatalysts after photocatalysis,a self-cleaning polyvinylidene fluoride(PVDF)/graphene oxide(GO)-ZnO photocatalytic composite flat membrane was prepared through phase inversion method(NIPS).PVDF was used as as the matrix membrane and the hydrophilic photocatalyst GO/ZnO was used as the additive.The structures and photocatalytic performances of the flat membranes were systematically studied.The results show that,compared with pure PVDF membrane,the pore size of PVDF/GO-ZnO photocatalytic flat membrane increases,significantly improving its hydrophilicity and water flux.When the doped amount of GO-ZnO is1.26%,the pure water flux of PVDF/GO-ZnO photocatalytic composite flat membrane M-4 is as high as 153.73 L/(m2·h),and the minimum pure water contact angle is 77°.After 80 min of simulated sunlight exposure,the photocatalytic composite flat membrane exhibites a degradation efficiency of 98.79%for methyl blue(MB).In addition,the photocatalytic degradation efficiency of this photocatalytic composite flat membrane after three cycles of dye degradation is still as high as 93.60%,and it still maintains good photocatalytic degradation effect in dye solutions with different acidity and alkalinity,showing good application prospects in industrial treatment of printing and dyeing wastewater.
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