Wang Xinya, Xiao Changfa, Liu Hailiang, Chen Mingxing, Hao Junqiang, Wu Yanjie
State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University No. 399, Binshui Road, Xiqing District Tianjin 300387 P. R. China
School of Material Science and Engineering, Tianjin Polytechnic University No. 399, Binshui Road, Xiqing District Tianjin 300387 P. R. China.
RSC Adv. 2018 Aug 3;8(49):27754-27762. doi: 10.1039/c8ra04547j. eCollection 2018 Aug 2.
In this study, poly(vinylidene fluoride--hexafluropropylene) (PVDF-HFP)/polytetrafluoroethylene (PTFE) blend membranes for water-in-oil emulsion separation were prepared a thermally induced phase separation (TIPS) method using dibutyl phthalate (DBP) and dioctyl phthalate (DOP) as a mixed diluent. The effects of PTFE content on the obtained membranes' structure and properties were studied. The results showed that the surface structure of the obtained membranes without addition of PTFE particles was denser and the surface pores got smaller. The porosity, pore size and hydrophobicity obviously increased with the increase in PTFE content. However, the breaking elongation and breaking strength decreased with the increase of PTFE content. When the PTFE content was 10 wt%, the obtained membrane showed the highest separation efficiency for different kinds of water-in-oil emulsions. In addition, the antifouling performance of the obtained membranes was also studied for many times of reuse. This paper introduces an effective and facile method to prepare hydrophobic-oleophilic membranes for water-in-oil emulsion separation.
在本研究中，采用热致相分离（TIPS）法，以邻苯二甲酸二丁酯（DBP）和邻苯二甲酸二辛酯（DOP）作为混合稀释剂，制备了用于油包水乳液分离的聚偏氟乙烯-六氟丙烯（PVDF-HFP）/聚四氟乙烯（PTFE）共混膜。研究了PTFE含量对所得膜结构和性能的影响。结果表明，未添加PTFE颗粒的所得膜的表面结构更致密，表面孔径更小。孔隙率、孔径和疏水性随PTFE含量的增加而明显增加。然而，断裂伸长率和断裂强度随PTFE含量的增加而降低。当PTFE含量为10 wt%时，所得膜对不同种类的油包水乳液表现出最高的分离效率。此外，还对所得膜多次重复使用后的抗污染性能进行了研究。本文介绍了一种有效且简便的方法来制备用于油包水乳液分离的疏水亲油膜。
