Abstract With the ever-increasing discharge of industrial oily wastewater, oil-water separation has attracted widespread concern in recent years. In this work, we fabricated a tannic acid/polyvinylpyrrolidone/SiO2 composite coating decorated PVDF membrane for effective oil-in-water emulsions separation. Tannic acid and polyvinylpyrrolidone form complex through hydrogen bonding, generating stable sol after associating with SiO2, which endows the hydrophobic PVDF membrane with superhydrophilicity and underwater superoleophobicity. The rejections of the modified membrane for the emulsions were higher than 99.9 % and the 5-min fluxes reached over 690 L∙m−2 h-1. Four rounds of continuous separation exhibited that the membrane has outstanding flux recovery capability with water washing among each cycle. We envision that this natural polyphenol chemistry inspired coating process with green, low-energy, cost-effective advantages indicates great potential for practical applications.

中文翻译：

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天然多酚化学启发的有机-无机复合涂层装饰 PVDF 膜用于水包油乳液分离

摘要 随着工业含油废水排放量的不断增加，油水分离近年来受到广泛关注。在这项工作中，我们制造了一种单宁酸/聚乙烯吡咯烷酮/SiO2 复合涂层装饰的 PVDF 膜，用于有效分离水包油乳液。单宁酸和聚乙烯吡咯烷酮通过氢键形成络合物，与SiO2缔合后生成稳定的溶胶，赋予疏水性PVDF膜超亲水性和水下超疏油性。改性膜对乳液的截留率高于 99.9%，5 分钟通量达到超过 690 L∙m-2 h-1。四轮连续分离表明，该膜在每次循环水洗时具有优异的通量回收能力。