文献类型：期刊文献

英文题名：An asymmetric super-wetting Janus PVDF oil-water separation membrane fabricated by a simple method on a non-woven substrate

作者：Wang, Jikui[1];Feng, Yuwei[1];Huang, Yicheng[1];Zou, Xinquan[1];Zhang, Yi[1];Liu, Wenxiu[1];Wang, Kun[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200030, Peoples R China

年份：2024

卷号：202

外文期刊名：REACTIVE & FUNCTIONAL POLYMERS

收录：;EI(收录号：20240021478);WOS:【SCI-EXPANDED(收录号:WOS:001253669200001)】；

语种：英文

外文关键词：Oil/water separation; Super-wetting; Janus PVDF membrane; Non-woven fabric substrate

摘要：Membrane separation technology is an important method of treating oily wastewater with great potential for development. However, preparation of membranes for efficiently separating complex oil-water mixtures continues to be challenging. In this study, a strategy for efficient construction of asymmetric wetting surfaces was designed, and successfully prepared an asymmetric super wetting Janus polyvinylidene fluoride (PVDF) modified separation membrane to separate complex oil-water emulsion. The composite PVDF membrane was prepared using a non-woven fabric substrate and phase conversion method. Subsequently, composite membrane was rapidly hydrophilic modified on one side using tannic acid and 3-aminopropyltriethoxysilane under the strong oxidizing effect of oxidant sodium periodate. Then non-woven fabric substrate was peeled off to obtain a Janus PVDF modified separation membrane. The front and back sides of the separation membrane have highly asymmetric micromorphology and wettability. The front side has hydrophilic/underwater oleophobic wettability (with a water contact angle of 31 degrees). The separation efficiency of oil-in-water emulsion is up to 99.5%, while the back side has super lipophilic/underoil hydrophobic wettability (with a water contact angle of 131 degrees). The separation efficiency of water-in-oil emulsion is up to 98.6%, improving the efficiency of oil in water separation and application range.