【摘要】 近年来,膜技术在油水分离中的应用受到了研究者的广泛关注。将ZnO纳米线与氧化石墨烯(GO)片层掺混,利用真空抽滤手段,在聚偏氟乙烯支撑层上制备ZnO/GO薄膜。试验证明,ZnO纳米线在GO纳米片层间的穿插,改进了GO薄膜的内部结构和表面性质,使得薄膜的各项性能均得到改善和提升。ZnO/GO薄膜呈现出亲水和水下超疏油的性质,亲水角和水下亲油角分别为65°和175°;同时,提高膜渗透性能,纯水通量高达2 100 L/(m~2·h),为纯GO薄膜的32倍;在油水分离试验中,ZnO/GO薄膜表现出良好的油水分离性能和抗油污染性能,出水的油含量低于5 mg/L,膜通量恢复率高于80%;在分离实际含油废水时,ZnO/GO薄膜保持良好的抗污染性能和分离性能,通量衰减率为5 L/(m~2·h·min),通量恢复率为80%,分离效率约为92.8%。综上,ZnO/GO薄膜是一种新型高效的油水分离膜,在含油废水处理领域具有良好的研究和应用前景。更多还原

【Abstract】 Membrane technology for oil/water separation has received increasing attention recently. The hydrophilic/underwater superoleophobic membrane with enhanced water permeability and antifouling ability were obtained by assembling graphene oxide(GO) nanosheets and zinc oxide(ZnO) nanowires with the assistance of vacuum filtration. The water contact angle and underwater oil contact angle of prepared ZnO/GO membrane were 65° and 175°, respectively, showing its hydrophilic and underwater superoleophobic properties. The permeability of ZnO/GO membrane was improved and the pure water flux was 2 100 L/(m~2·h), which was more than 32 times that of the pristine GO membrane. ZnO/GO membrane showed excellent oil/water separation efficiency and anti-oil-fouling ability, as residual oil in filtrate was below 5 mg/L after separation and flux recovery ratio was over 80%. Moreover, for treating practical wastewater, ZnO/GO membrane maintained great anti-oil-fouling ability and separation efficiency, as flux decline rate was 5 L/(m~2·h·min), flux recovery ratio was 80% and separation efficiency was about 92.8%. All enhanced properties of ZnO/GO membrane enlighten the great prospects in oil-water treatment.更多还原