Abstract A structurally controlled polyethersulfone (PES) membrane, as the substrate of the thin film composite nanofiltration (NF) membranes, was designed and fabricated with aligned carbon nanotubes (ACNTs) by a direct current electric field. The morphology and properties of the NF membranes were simultaneously affected by the PES substrate with especial macrovoids and ACNTs, increasing the permeability from 6.4 to 29.7 L/m2 h bar. It was confirmed by FT-IR and XPS that the poly(piperazine amide) selective layer of the modified NF membrane has an increased content of –COOH for enhanced hydrophilicity. The zeta potential proves that the surface of the NF membrane modified by electric field has weaker negative charge than that of unmodified membrane in the range of pH = 5–9. Under the combined action of the Donnan effect and size exclusion, the rejection of MgCl2 increased while maintaining the dianion rejection above 95%. Particularly, the NF membrane modified with ACNTs exhibited better chlorine resistance and antifouling ability, thus improving the stability and perdurability of membranes. Our work utilizes the characteristics of ACNTs to explore its potential in NF membranes.

中文翻译：

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具有结构可控的 PES 基材的高性能纳滤膜，其中包含电排列的 CNT

摘要 以定向碳纳米管（ACNTs）为材料，通过直流电场设计并制备了结构可控的聚醚砜（PES）膜，作为薄膜复合纳滤（NF）膜的基材。NF 膜的形态和性能同时受到具有特殊大孔隙和 ACNT 的 PES 基材的影响，将渗透率从 6.4 L/m2 h bar 增加到 29.7 L/m2 h bar。FT-IR 和 XPS 证实，改性 NF 膜的聚（哌嗪酰胺）选择性层具有增加的 -COOH 含量以增强亲水性。zeta 电位证明，在 pH=5-9 范围内，电场改性的 NF 膜表面比未改性膜表面具有更弱的负电荷。在唐南效应和尺寸排阻的共同作用下，MgCl2 的排斥增加，同时将二价阴离子排斥保持在 95% 以上。特别是用ACNTs改性的NF膜表现出更好的耐氯性和防污能力，从而提高了膜的稳定性和耐久性。我们的工作利用 ACNT 的特性来探索其在 NF 膜中的潜力。