Covalent crosslinked polyelectrolyte complex membrane with high negative charges towards anti-natural organic matter fouling nanofiltration
Covalent crosslinked polyelectrolyte complex membrane with high negative charges towards anti-natural organic matter fouling nanofiltration
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DOI：
10.1039/c4ra11602j
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发表时间：
2015-01
期刊：
影响因子：
3.9
通讯作者：
Linglong Shan;H. Guo;Zhen-ping Qin;Naixin Wang;S. Ji;Guojun Zhang;Zhongguo Zhang
中科院分区：
文献类型：
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作者：
Linglong Shan;H. Guo;Zhen-ping Qin;Naixin Wang;S. Ji;Guojun Zhang;Zhongguo Zhang
膜技术去除饮用水中的天然有机物（NOM）日益受到人们的关注。然而，膜的污染是制约其广泛应用的最大障碍之一。因此，采用逐层组装的方法在聚丙烯腈（PAN）支撑膜上形成带负电的多层膜，获得了一种抗nom污染的聚电解质复合物（PEC）膜。采用戊二醛交联法制备了聚乙烯亚胺/聚4-苯乙烯磺酸钠/PAN静电组装膜，以提高聚乙烯亚胺膜的稳定性。发现化学交联后膜表面zeta电位降低，进一步提高了膜对NOM的静电斥力，从而提高了膜的抗NOM污染性能。30 d纳滤实验结果表明，交联膜稳定性好，对NOM的去除率较高；交联膜的渗透率是未交联膜的两倍。
Removal of natural organic matter (NOM) from drinking water by membrane technology is attracting increasing attention. However, the fouling of the membrane by NOM is one of the biggest obstacles restricting its widespread application. Therefore an anti-NOM fouling polyelectrolyte complex (PEC) membrane was obtained by creating a negatively charged multilayer on a polyacrylonitrile (PAN) supporting membrane using a layer-by-layer assembly method. To improve the stability of the PEC membrane, the electrostatically assembled (poly(ethyleneimine)/poly(sodium 4-styrenesulfonate))n/PAN membranes were crosslinked by glutaraldehyde. It was found that the zeta potential of the membrane surface decreased after chemical crosslinking, which further improved the electrostatic repulsion to NOM and thus improved the anti-NOM fouling property. Results of a 30 day nanofiltration operation showed the crosslinked membrane had good stability and gave a higher rejection of NOM; the permeance of the crosslinked membrane was double that of the uncrosslinked membrane.