超亲水-水下超疏油PVDF-g-PAA多孔膜的制备及油水分离性能

摘要

Traditional polymer membranes used for treating emulsified oil/water mixtures always suffer from low flux, membrane damage and separation efficiency decline, which limit its further application. Here we fabricated a superhydrophilic and underwater superoleophobic poly ( vinylidene fluoride )-grafed-poly ( acrylic acid) [ PVDF-g-PAA] membrane by salt-induced phase inversion method, the saturated sodium chloride solu-tion was used as coagulation bath. In order to improve membrane performance polyvinylprrolidone( PVP) was added as porogen to improve internal structure of the membrane. The result showed that when the content of PVP was 5% the PVDF-g-PAA membrane could be used to separate both simple oil/water mixture and oil in water emulsion, the separation efficiency of oil in water emulsion still reaches 91% after several times and the flux maintained at 444 L/( m2 · h) or more. Also the membrane exhibits an excellent antifouling property and is easily recycled for long-term use. The outstanding performance of the membrane and the efficient, energy and cost-effective preparation process highlight its potential for practical applications.%采用相反转方法制备了丙烯酸( AA)接枝的超亲水-水下超疏油聚偏氟乙烯膜( PVDF-g-PAA)，通过加入一定量的聚乙烯吡咯烷酮获得可用于油水分离的多孔聚偏氟乙烯膜。多孔聚偏氟乙烯膜具有较好的抗油污染性能及较高的力学强度，可以快速高效地分离油水混合体系和乳化油水体系，分离性质稳定，多次使用后对油水混合物的分离效率在98%以上，对油水乳化液的分离效率在91%以上，可广泛应用于油水混合体系和乳化油水体系的油水分离。