Constructing a zwitterionic ultrafiltration membrane surface via multisite anchorage for superior long-term antifouling properties
Constructing a zwitterionic ultrafiltration membrane surface via multisite anchorage for superior long-term antifouling properties
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DOI：
10.1039/c5ra04086h
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发表时间：
2015-04
期刊：
影响因子：
3.9
通讯作者：
Junao Zhu;Yanlei Su;Xueting Zhao;Yafei Li;Runnan Zhang;X. Fan;Yanyan Ma;Yuan Liu;Zhongyi Jiang
中科院分区：
文献类型：
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作者：
Junao Zhu;Yanlei Su;Xueting Zhao;Yafei Li;Runnan Zhang;X. Fan;Yanyan Ma;Yuan Liu;Zhongyi Jiang
含平衡电荷基团的两性离子由于其高度水化的结构，在制备抗污染膜方面受到越来越多的关注。简单有效的共价连接方法来提高膜表面两性离子的稳定性仍然是一个具有挑战性的方法。本文以S支化聚乙烯亚胺(PEI)为原料，与氯乙酸钠进行季胺化反应合成两性离子。将PEI基两性离子(Z-PEI)接枝到水解膜(H-PAN)表面，构建了一种新型的具有中性表面电荷的两性离子表面。Z-PEI与H-PAN膜之间形成了共价键，静电引力促进了这一反应。两性离子膜具有良好的抗污染能力(通量恢复率约为99.8%，总通量降幅约为31.4%)，这是由于两性离子在膜表面形成了致密的水合层。此外，在长期实验过程中，通量恢复率没有明显变化，在酸和碱溶液中浸泡后，通量恢复率分别保持在96.3%和98.4%。这些结果表明，通过多位共价锚定，两性离子功能表面的长期稳定性和化学稳定性显著提高。
Zwitterions bearing balanced charge groups have attracted increasing attention to fabricate antifouling membranes due to their highly hydrated structure. The simple and efficient method of covalent connection to enhance the stability of the zwitterions on membrane surfaces is still challenging. Herein, s branched polyethyleneimine (PEI) was employed to synthesize the zwitterion by a quaternary amination reaction with sodium chloroacetate. A novel zwitterionic surface with neutral surface charge was constructed by grafting the PEI-based zwitterion (Z-PEI) onto the hydrolyzed PAN (H-PAN) membrane surface. Covalent bonds were formed between the Z-PEI and H-PAN membrane while the electrostatic attraction would promote this reaction. The zwitterionic membranes exhibited superior antifouling ability (flux recovery ratio of about 99.8% and total flux decline of about 31.4%) due to the formation of a tight hydration layer by zwitterions on the membrane surface. Furthermore, the flux recovery ratio was not changed obviously during the long term experiment and could be maintained at as high as 96.3 and 98.4% after immersion in acid and alkali solution, respectively. These results demonstrated that the long term and chemical stability of zwitterionic functional surfaces were significantly enhanced via multisite covalent anchorage.