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

机译：聚酰胺TFC纳滤膜改善改善分离和防污性能的改性

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摘要

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，提出了一种树突式的Timesoyl酰胺胺（TMAAM）单体用作改变常规芳族聚酰胺薄膜复合物（TFC）纳米滤膜（NF）膜的关键官能单体，以及一种新的TMAAM基础因此通过界面聚合制备半芳族聚酰胺复合NF膜。系统地研究了PIP / TMAAM比率（PIP = PIP筛选）对膜化学结构，表面性质和分离性能的影响。随着膜中的TMAAM含量的增加，水通量大大增加，但盐排斥仅略微降低。当PIP / TMAAM比率为1时，膜NF-2表现出更光滑和更亲水的表面，因此它为不同的价盐显示出最佳的分离性能。此外，TMAAM改性TFC膜呈现极高的抑制力，对带负电荷的染料分子和高渗透的一价盐，导致染料/盐分离施用的良好前景。此外，在长期运行过程中，基于TMAAM的膜的水通量和盐排斥均稳定，膜呈现出有利的防污性和有效的清洁回收。因此，该作品提供了一种新型的半芳族聚酰胺复合NF膜，其通过具有高亲水性，良好的稳定性和强抗结垢性能的界面聚合而通过界面和直接的方法制造。

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  • 来源
    《RSC Advances》 |2018年第27期|共9页
  • 作者

    Liu Li-Fen; Huang Xiang; Zhang Xiao; Li Ke; Ji Yan-Li; Yu Chun-yang; Gao Cong-Jie;

  • 作者单位

    Zhejiang Univ Technol Ocean Coll Ctr Membrane &

    Water Sci &

    Technol Hangzhou 310014 Zhejiang Peoples R China;

    Zhejiang Univ Technol Ocean Coll Ctr Membrane &

    Water Sci &

    Technol Hangzhou 310014 Zhejiang Peoples R China;

    Zhejiang Univ Technol Ocean Coll Ctr Membrane &

    Water Sci &

    Technol Hangzhou 310014 Zhejiang Peoples R China;

    Shanghai Jiao Tong Univ State Key Lab Met Matrix Composites Sch Chem &

    Chem Engn 800 Dongchuan Rd Shanghai 200240 Peoples R China;

    Zhejiang Univ Technol Ocean Coll Ctr Membrane &

    Water Sci &

    Technol Hangzhou 310014 Zhejiang Peoples R China;

    Shanghai Jiao Tong Univ State Key Lab Met Matrix Composites Sch Chem &

    Chem Engn 800 Dongchuan Rd Shanghai 200240 Peoples R China;

    Zhejiang Univ Technol Ocean Coll Ctr Membrane &

    Water Sci &

    Technol Hangzhou 310014 Zhejiang Peoples R China;

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  • 正文语种 eng
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