Forward osmosis (FO) is an emerging approach in water treatment, but its application is restricted by severe internal concentration polarization (ICP) and low flux. In this work, a self-sustained carbon nanotube hollow fiber scaffold supported polyamide thin film composite (CNT TFC-FO) membrane was first proposed with high porosity, good hydrophilicity and excellent electro-conductivity. It showed a specific structure parameter as low as 126 μm, suggesting its weakened ICP. Against a pure water feed using 2.0 M NaCl draw solution, its fluxes were 4.7 and 3.6 times as high as those of the commercial cellulose triacetate TFC-FO membrane in the FO and pressure retarded osmosis (PRO) modes, respectively. Meanwhile, the membrane showed excellent electrically assisted resistance to organic and microbial fouling. Its flux was improved by about 50% during oil–water simulation separation under 2.0 V voltage. These results indicate that the CNT TFC-FO membrane opens up a frontier for stably and effectively recycling potable water from electrochemical FO process.

中文翻译：

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基于碳纳米管中空纤维支架的高渗透性薄膜复合正渗透膜，具有电增强的抗污性

正向渗透（FO）是水处理中的一种新兴方法，但其应用受到严重的内部浓度极化（ICP）和低通量的限制。在这项工作中，首先提出了一种具有高孔隙率，良好的亲水性和优异的导电性的自持式碳纳米管中空纤维支架支撑的聚酰胺薄膜复合材料（CNT TFC-FO）膜。它显示出低至126μm的特定结构参数，表明ICP较弱。对于使用2.0 M NaCl汲取溶液的纯水进料，其通量分别是市售三乙酸纤维素TFC-FO膜在FO和压力延迟渗透（PRO）模式下的通量的4.7和3.6倍。同时，该膜显示出优异的电辅助抗有机和微生物结垢性。在2.0 V电压下的油水模拟分离过程中，其通量提高了约50％。这些结果表明，CNT TFC-FO膜为稳定和有效地回收电化学FO工艺中的饮用水开辟了一条前沿领域。