PVDF/GO-ZnO光催化复合平板膜的制备及其性能

Preparation and Properties of PVDF/GO-ZnO Photocatalytic Composite Flat Membranes

为有效解决纳米催化剂光催化后的回收困难问题,本文以聚偏氟乙烯(PVDF)为基质膜,以亲水性的光催化剂氧化石墨烯(GO)/氧化锌(ZnO)为添加剂,通过相转化法(NIPS)制备出具有自清洁功能的PVDF/GO-ZnO光催化复合平板膜,并对其结构及光催化性能进行了系统研究。与纯PVDF膜相比,PVDF/GO-ZnO光催化平板膜的孔径增加,使其亲水性和水通量显著提高。其中,GO-ZnO掺杂量为1.26%的PVDF/GO-ZnO光催化复合平板膜M-4的纯水通量高达153.73 L/(m^(2)·h),纯水接触角最小为77°。在模拟太阳光照射80 min时,该光催化复合平板膜对甲基蓝(MB)的降解效率高达98.79%。此外,该光催化平板膜3次循环降解染料后的光催化降解效率仍高达93.60%,且在不同酸碱性的染料溶液中依旧保持良好的光催化降解效果,在工业处理印染废水中显示出很好的应用前景。

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 is 1.26%,the pure water flux of PVDF/GO-ZnO photocatalytic composite flat membrane M-4 is as high as 153.73 L/(m^(2)·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.