College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, China; Department of Mechanical Engineering, National University of Singapore, Singapore 117574, Singapore.
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, China.
Sci Total Environ. 2020 Aug 10;729:138876. doi: 10.1016/j.scitotenv.2020.138876. Epub 2020 Apr 23.
The oil and bacteria adhesion during membrane separation process brings great challenges to the operation costs and membrane service life. Meantime, the strong chemical corrosion in sewage seriously limits the durability of membrane as well. Herein, a facile strategy is developed for fabricating highly stable and efficient zwitterionic nanofibrous membrane (NFM) with self-cleaning feature via the combination of in-situ cross-linking of poly (sulfobetaine methacrylate) (PSBMA) and electrospun poly (ether sulfone) (PES) nanofibers. Owing to the introduction of zwitterionic functional groups, the PSBMA/PES NFM exhibits superior antifouling ability (over 3 cycles of crude oil fouling/self-cleaning and up to 7 days of bacteria adhesion/repelling tests). Moreover, the membrane also presents remarkable chemical stability in acidic, alkaline and salty environments; and exhibits excellent separation performance for both layered oil/water mixture and oil-in-water emulsion as well. Furthermore, the membrane is capable to remove bacteria during the continuous oil/water mixture separation. Overall, the proposed strategy provides a new perspective into developing long-term antifouling membrane materials for complicated oily wastewater remediation in various corrosive environments.
在膜分离过程中，油和细菌的附着给运行成本和膜寿命带来了巨大的挑战。同时，污水中强烈的化学腐蚀也严重限制了膜的耐久性。在此，通过聚（磺酸甜菜碱甲基丙烯酸酯）（PSBMA）的原位交联和静电纺丝聚醚砜（PES）纳米纤维的结合，开发了一种简便的策略，用于制备具有自清洁功能的高度稳定和高效的两性离子纳米纤维膜（NFM）。由于引入了两性离子官能团，PSBMA/PES NFM 表现出优异的抗污染能力（超过 3 个原油污染/自清洁循环和长达 7 天的细菌附着/排斥测试）。此外，该膜在酸性、碱性和含盐环境中也表现出优异的化学稳定性；并且对分层油/水混合物和油包水乳液都表现出优异的分离性能。此外，该膜能够在连续的油水混合物分离过程中去除细菌。总的来说，该策略为在各种腐蚀性环境中处理复杂含油废水提供了一种开发长期抗污染膜材料的新视角。
