In this work, a dendrimer trimesoyl amide amine (TMAAM) monomer was proposed to be used as a key functional monomer to modify the conventional aromatic polyamide thin-film composite (TFC) nanofiltration (NF) membrane, and a new kind of TMAAM-based semi-aromatic polyamide composite NF membrane was thus prepared by interfacial polymerization. The effects of the PIP/TMAAM ratio (PIP = piperazine) on the membrane chemical structure, surface properties and separation performances were investigated systematically. With the increase in TMAAM content loaded in the membrane, the water flux strongly increased but the salt rejection decreased only slightly. When the PIP/TMAAM ratio was 1, the membrane NF-2 exhibited a smoother and more hydrophilic surface, as a result of which it displayed an optimum separation performance for different valent salts. In addition, the TMAAM modified TFC membrane presented an extremely high rejection to negatively charged dye molecules and high permeation for monovalent salts, leading to good prospects for dye/salt separation application. Moreover, both the water flux and salt rejection of the TMAAM-based membrane were stable in a long-term running process, and the membrane showed a favourable anti-fouling property and efficient cleaning recovery. Therefore, this work provides a new type of semi-aromatic polyamide composite NF membrane fabricated by a facile and straightforward method via interfacial polymerization with high hydrophilicity, good stability and strong anti-fouling property.

中文翻译：

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聚酰胺TFC纳滤膜的改性提高分离和防污性能

在这项工作中，提出了一种树枝状大分子均苯三甲酰胺胺（TMAAM）单体作为关键功能单体对传统的芳香族聚酰胺薄膜复合（TFC）纳滤（NF）膜进行改性，以及一种新型的TMAAM基因此通过界面聚合制备了半芳族聚酰胺复合纳滤膜。系统研究了PIP/TMAAM比（PIP=哌嗪）对膜化学结构、表面性质和分离性能的影响。随着膜中负载的 TMAAM 含量的增加，水通量显着增加，但脱盐率仅略有下降。当 PIP/TMAAM 比值为 1 时，膜 NF-2 表现出更光滑和更亲水的表面，因此它对不同的价盐表现出最佳的分离性能。此外，TMAAM改性TFC膜对带负电荷的染料分子具有极高的截留率，对单价盐具有高渗透性，在染料/盐分离应用方面具有良好的前景。此外，TMAAM基膜的水通量和脱盐率在长期运行过程中均保持稳定，膜表现出良好的防污性能和高效的清洗回收率。因此，本工作提供了一种新型的半芳族聚酰胺复合纳滤膜，该膜采用简便直接的方法制备。TMAAM基膜的水通量和脱盐率在长期运行过程中均保持稳定，膜表现出良好的防污性能和高效的清洗回收率。因此，本工作提供了一种新型的半芳族聚酰胺复合纳滤膜，该膜采用简便直接的方法制备。TMAAM基膜的水通量和脱盐率在长期运行过程中均保持稳定，膜表现出良好的防污性能和高效的清洗回收率。因此，本工作提供了一种新型的半芳族聚酰胺复合纳滤膜，该膜采用简便直接的方法制备。经界面聚合而成，亲水性高，稳定性好，抗污性强。