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Electrospun ultrafine fibrous PTFE-supported ZnO porous membrane with self-cleaning function for vacuum membrane distillation
作者:Huang, Qing-Lin Huang, Yan Xiao, Chang-Fa You, Yan-Wei Zhang, Chao-Xin
关键字:PTFE/ZnO ultrafine fibrous membrane Electrospinning Photocatalysis VMD Self-cleaning
论文来源:期刊
具体来源:Journal of Membrane Science
发表时间:2017年

In this work, novel photocatalytic porous membranes consisting of ZnO supported by a poly(tetrafluoroethylene)

(PTFE) substrate were fabricated by sintering electrospun PTFE/poly(vinylalcohol) (PVA)/zinc acetate

dehydrate composite membranes after removal of the PVA carrier. The rheological properties of spinning

solution were investigated. Results showed that the spinning solution exhibited good electrospinning

performance and the membranes exhibited excellent flexibility, high chemical stability, and a highly specific

surface area. The photocatalyst-ZnO particles derived from the thermal decomposition of zinc acetate dehydrate

were homogeneously immobilized on the surface of ultrafine PTFE fibers to avoid the influence of agglomeration

and sedimentation when ZnO particles were added directly. The performances of PTFE/ZnO membranes were

investigated in vacuum membrane distillation (VMD) with photo-degradation experiments. Results indicated

that appropriate PTFE/ZnO membranes could be an effective way for salt rejection and dye removal at the same

time. In the VMD with photo-degradation experiments, the salt rejection was up to 99.70% and the dye removal

rate of feed solution was up to 45% after 10-h operating time. Meanwhile, the PTFE/ZnO membranes also

showed good self-cleaning ability. The fouled membranes could be cleaned after the 3-h UV irradiation with a

permeate flux recovery rate of more than 94% after UV irradiation cleaning for 3-h. The immobilization of ZnO

on substrate of ultrafine fibrous PTFE porous membranes may provide a wide range of potential applications for

the treatment of dye-containing effluent.