Abstract This study investigates the effect of surface functionalization of a thin-film composite forward osmosis membrane with zwitterions and silver-based metal organic frameworks (Ag-MOFs) to improve the antifouling, anti-biofouling, and antimicrobial activity of the membrane. Two types of zwitterions, namely, 3-bromopropionic acid and 1,3-propane sultone, are chemically bonded, with and without incorporation of Ag-MOFs, over the surface of a polyamide membrane. Spectroscopy measurements indicate successful grafting of the modifying agents on the membrane surface. Contact angle measurements demonstrate a notable improvement in surface wettability upon functionalization. The performance of the membranes is evaluated in terms of water and salt fluxes in forward osmosis filtrations. The transport data show demonstrably increased water flux of around 300% compared to pristine membranes, with similar or slightly reduced salt reverse flux. The antifouling and anti-biofouling properties of the modified membranes are evaluated using sodium alginate and E. coli, respectively. These experiments reveal that functionalized membranes exhibit significant antifouling and anti-biofouling behavior, with high resilience against flux decline.

中文翻译：

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通过用两性离子和银基金属有机骨架进行表面改性，提高正渗透膜的防污和抗菌性能

摘要 本研究研究了具有两性离子和银基金属有机骨架 (Ag-MOF) 的薄膜复合正渗透膜的表面功能化对提高膜的防污、抗生物污损和抗菌活性的影响。两种类型的两性离子，即 3-溴丙酸和 1,3-丙烷磺内酯，在聚酰胺膜的表面上通过化学键合，加入或不加入 Ag-MOF。光谱测量表明改性剂在膜表面上成功接枝。接触角测量表明功能化后表面润湿性显着改善。根据正向渗透过滤中的水和盐通量来评估膜的性能。传输数据显示，与原始膜相比，水通量明显增加了约 300%，盐逆通量相似或略有降低。分别使用海藻酸钠和大肠杆菌对改性膜的防污和抗生物污性能进行了评估。这些实验表明，功能化膜表现出显着的防污和抗生物污损行为，对通量下降具有高弹性。