Complex organic matter causes severe fouling when membranes are applied for shale gas wastewater (SGW) treatment. This study reports the grafting of a zwitterionic polymer brush consisting of poly (sulfobetaine methacrylate) (PSBMA) onto the surface of a commercial nanofiltration (NF) membrane via electron transfer-atom transfer radical polymerization (ARGET-ATRP) to achieve anti-fouling property, especially against organic foulants. Compared to the pristine NF membranes, the PSBMA-grafted NF membrane showed high performance when challenged by SGW as a feed stream: (1) The flux stability was significantly improved during long-term operation, with a 64.28% increase in flux normalization at 50% recovery rate of SGW, while maintaining a suitable initial flux and near constant ion removal rate; (2) Based on excitation-emission-matrix spectra integrated in the fluorescence region, the removal of protein-like organic matters and humus-like organic matters increased by 34% and 16.5%, respectively; (3) The XDLVO theory supports the hypothesis that the hydrophobic interactions between the membrane surface and organic foulants were reduced by enhancing the Lewis acid-base interaction energy. The proposed anti-fouling zwitterionic membranes has potential in industrial application for the on-site reuse of SGW.

当膜用于页岩气废水 (SGW) 处理时，复杂的有机物会导致严重的污染。本研究报告了由聚（磺基甜菜碱甲基丙烯酸酯）（PSBMA）组成的两性离子聚合物刷通过电子转移-原子转移自由基聚合（ARGET-ATRP）接枝到商业纳滤（NF）膜的表面，以实现防污性能，尤其是针对有机污染物。与原始 NF 膜相比，PSBMA 接枝的 NF 膜在受到 SGW 作为进料流的挑战时表现出高性能：（1）长期运行期间通量稳定性显着提高，在 50 时通量标准化增加了 64.28% SGW的%回收率，同时保持合适的初始通量和接近恒定的离子去除率；(2)基于荧光区集成的激发-发射-矩阵光谱，类蛋白质有机物和类腐殖质有机物的去除率分别提高了34%和16.5%；(3) XDLVO 理论支持通过增强路易斯酸碱相互作用能减少膜表面与有机污染物之间的疏水相互作用的假设。所提出的防污两性离子膜在工业应用中具有用于 SGW 现场再利用的潜力。