Polyamide Nanofiltration Membranes from Emulsion-Mediated Interfacial Polymerization
Polyamide Nanofiltration Membranes from Emulsion-Mediated Interfacial Polymerization
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DOI：
10.1021/acsestengg.0c00213
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发表时间：
2021-01-08
影响因子：
7.1
通讯作者：
Lin, Shihong
中科院分区：
文献类型：
--
作者：
Liang, Yuanzhe;Teng, Xiangxiu;Lin, Shihong
由于纳滤膜在水处理、废水回用和工业分离中的广泛应用，使用界面聚合（IP）制造纳滤膜（NF）继续受到研究和开发的巨大兴趣。已经探索了许多方法来通过调节IP过程来提高NF膜的性能。在这些方法中，表面活性剂的使用由于其低成本和与用于膜制造的现有基础设施的兼容性而显示出强大的潜力。虽然近年来表面活性剂的不同作用已越来越多地阐明，但对IP过程中乳液形成的作用知之甚少。在这项研究中，我们研究了非离子型乳化表面活性剂对聚酰胺纳滤膜的形成，性质和性能的影响。两种表面活性剂进行了比较，包括亲水性吐温80，这是一种水包油（o/w）乳化剂中加入的水溶液中的哌嗪，和亲脂性司盘80，这是一种油包水（w/o）乳化剂中加入的己烷溶液中均苯三甲酰氯。我们的研究结果说明了乳液作为“车辆”，以促进单体转移和作为“微反应器”，为IP提供额外的和分布式的接口的影响。取决于表面活性剂是o/w还是w/o乳化剂，所得膜具有独特的物理化学性质和NF性能。在这两种情况下，以低至中等浓度添加非离子表面活性剂导致更小的孔径和更窄的孔径分布。总的来说，这项研究提供了重要的见解如何IP过程和所得的NF膜的乳液的形成的影响。
Fabrication of nanofiltration (NF) membranes using interfacial polymerization (IP) continues to receive tremendous interest in research and development due to the broad applications of NF in water treatment, wastewater reuse, and industrial separations. Many approaches have been explored to enhance the performance of NF membranes by regulating the IP process. Among these approaches, the use of surfactants has shown strong potential due to its low cost and compatibility with existing infrastructure for membrane fabrication. While the different roles of the surfactants have been increasingly elucidated in recent years, little is known for the role of emulsion formation in the IP process. In this study, we investigate the impacts of nonionic, emulsifying surfactants on the formation, properties, and performance of the polyamide NF membranes. Two surfactants were compared, including the hydrophilic Tween 80, which is an oil-in-water (o/w) emulsifier added in the aqueous solution of piperazine, and the lipophilic Span 80, which is a water-in-oil (w/o) emulsifier added in the hexane solution of trimesoyl chloride. Our results illustrate the effects of emulsions as "vehicles" to facilitate monomer transfer and as "microreactors" for providing additional and distributed interfaces for IP. Depending on whether the surfactants are o/w or w/o emulsifiers, the resulting membranes have unique physicochemical properties and NF performance. In both cases, the addition of nonionic surfactants at low-to-moderate concentrations results in smaller pore sizes and a narrower pore size distribution. Overall, this study provides important insights into how the IP process and the resulting NF membranes are influenced by the formation of emulsions.