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Modification of polyamide TFC nanofiltration membrane for improving separation and antifouling properties

机译：改性聚酰胺TFC纳滤膜以改善分离和防污性能

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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.
机译：在这项工作中，提出了将树状大分子偏苯三甲胺（TMAAM）单体用作关键功能单体，以修饰常规的芳香族聚酰胺薄膜复合（TFC）纳滤（NF）膜，并提出了一种新型的基于TMAAM的由此通过界面聚合制备了半芳族聚酰胺复合NF膜。系统地研究了PIP / TMAAM比（PIP =哌嗪）对膜化学结构，表面性质和分离性能的影响。随着装载在膜中的TMAAM含量的增加，水通量急剧增加，而盐分截留率仅略有下降。当PIP / TMAAM比为1时，膜NF-2表现出更光滑和更亲水的表面，因此，它对不同的盐显示出最佳的分离性能。另外，TMAAM改性的TFC膜对带负电的染料分子表现出极高的排斥力，对一价盐的渗透性也很高，从而为染料/盐分离应用提供了良好的前景。而且，TMAAM基膜的水通量和脱盐率在长期运行过程中均稳定，并且该膜显示出良好的防污性能和有效的清洁回收率。因此，这项工作提供了一种新型的半芳族聚酰胺复合NF膜，该膜通过界面聚合反应通过简便而直接的方法制备，具有高亲水性，良好的稳定性和强大的防污性能。

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