Delamination-Free In-Air and Underwater Oil-Repellent Filters for Oil-Water Separation: Gravity-Driven and Cross-Flow Operations
Delamination-Free In-Air and Underwater Oil-Repellent Filters for Oil-Water Separation: Gravity-Driven and Cross-Flow Operations
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DOI：
10.3390/en14217429
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发表时间：
2021-11
期刊：
影响因子：
3.2
通讯作者：
Bishwas Shrestha;M. Ezazi;Gibum Kwon
中科院分区：
文献类型：
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作者：
Bishwas Shrestha;M. Ezazi;Gibum Kwon
分离油水混合物在各种实际应用中至关重要，包括工业废水处理、溢油清理以及石油产品净化。在已使用的各种方法中，膜是分离油水乳状液最有吸引力的技术。近年来，选择性润湿膜在油水分离方面引起了特别关注。与水下疏油膜相比，具有亲水性和空气中疏油润湿性的膜表面已证明其油水分离效果增强。然而，开发亲水且空气中疏油的膜表面并不是一项简单的任务。当应用这些膜进行分离时，涂层分层过程是一个关键挑战。受上述启发，在本研究中，我们利用聚（乙二醇）二丙烯酸酯（PEGDA）和1H,1H,2H,2H-十七氟癸基丙烯酸酯（F-丙烯酸酯）在过滤器上制造亲水和空气疏油涂层。我们利用甲基丙烯酰氧基丙基三甲氧基硅烷 (MEMO) 作为附着力促进剂，以增强涂层对过滤器的附着力。该过滤器具有强大的拒油性，可防止油粘附和油结垢。利用过滤器，证明了表面活性剂稳定的油水乳液的重力驱动和连续分离。最后，我们证明过滤器可以在冲洗后多次重复使用，以进一步实现油水分离。
Separating oil-water mixtures is critical in a variety of practical applications, including the treatment of industrial wastewater, oil spill cleanups, as well as the purification of petroleum products. Among various methodologies that have been utilized, membranes are the most attractive technology for separating oil-water emulsions. In recent years, selective wettability membranes have attracted particular attention for oil-water separations. The membrane surfaces with hydrophilic and in-air oleophobic wettability have demonstrated enhanced effectiveness for oil-water separations in comparison with underwater oleophobic membranes. However, developing a hydrophilic and in-air oleophobic surface for a membrane is not a trivial task. The coating delamination process is a critical challenge when applying these membranes for separations. Inspired by the above, in this study we utilize poly(ethylene glycol)diacrylate (PEGDA) and 1H,1H,2H,2H-heptadecafluorodecyl acrylate (F-acrylate) to fabricate a hydrophilic and in-air oleophobic coating on a filter. We utilize methacryloxypropyl trimethoxysilane (MEMO) as an adhesion promoter to enhance the adhesion of the coating to the filter. The filter demonstrates robust oil repellency preventing oil adhesion and oil fouling. Utilizing the filter, gravity-driven and continuous separations of surfactant-stabilized oil-water emulsions are demonstrated. Finally, we demonstrate that the filter can be reused multiple times upon rinsing for further oil-water separations.