Abstract In this work, we fabricated a sandwich-like single-walled carbon nanotubes (SWCNTs)-coated support for the preparation of high-performance antifouling thin-film composite (TFC) forward osmosis (FO) membrane. This sandwich-like support was prepared through the deposition of polydopamine modified SWCNTs (PDA-SWCNTs) on both sides of the polyethersulfone (PES) microfiltration (MF) membrane. The CNTs top layer was found to facilitate the formation of polyamide layer. The CNTs back layer provided an antifouling surface for the prevention of foulants adsorption and intrusion into the PES support. Results demonstrate that the CNTs back layer imparted superior rejection towards bovine serum albumin (BSA) (~98.1%) and enhanced hydrophilicity. The TFC FO membrane (TFC-modified) having the sandwich-like SWCNTs-coated support exhibited excellent perm-selectivity with the water flux Jw of 35.7 Lm−2 h−1 and the reverse salt flux Js of 1.42 gm−2 h−1 when tested in the mode of active layer facing to draw solution (AL-DS) using 1 M NaCl as a draw solution. Dynamic fouling experiments confirm that the TFC-modified membrane possessed effective antifouling performances with a low relative fouling degree (RFD) of 19.0% during the cross-flow run and 8.4% during the BSA adsorption test, which were much lower than the corresponding values of 36.1% and 15.4% for the TFC-control membrane.

中文翻译：

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通过构建夹心状碳纳米管涂层载体提高薄膜复合正渗透膜的防污和通量性能

摘要 在这项工作中，我们制造了一种三明治状的单壁碳纳米管 (SWCNTs) 涂层载体，用于制备高性能防污薄膜复合材料 (TFC) 正向渗透 (FO) 膜。通过在聚醚砜 (PES) 微滤 (MF) 膜的两侧沉积聚多巴胺改性的 SWCNT (PDA-SWCNT) 来制备这种夹心状载体。发现碳纳米管顶层有利于聚酰胺层的形成。碳纳米管背层提供了一个防污表面，以防止污染物吸附和侵入 PES 载体。结果表明，碳纳米管背层赋予了对牛血清白蛋白 (BSA) (~98.1%) 的优异排斥和增强的亲水性。具有夹层状 SWCNT 涂层载体的 TFC FO 膜（TFC 改性）表现出优异的渗透选择性，水通量 Jw 为 35.7 Lm-2 h-1，反向盐通量 Js 为 1.42 gm-2 h-1当使用 1 M NaCl 作为绘制溶液在活性层面向绘制溶液 (AL-DS) 模式下进行测试时。动态污染实验证实，TFC 改性膜具有有效的防污性能，错流运行时的相对污染度 (RFD) 为 19.0%，BSA 吸附测试时的相对污染度 (RFD) 为 8.4%，远低于相应的值TFC 控制膜为 36.1% 和 15.4%。