CIESC Journal ›› 2018, Vol. 69 ›› Issue (2): 858-865.DOI: 10.11949/j.issn.0438-1157.20170978

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Biguanidine functionalized polyvinylamine modified reverse osmosis membrane with improved anti-bacterial property

ZHOU Yixuan, WANG Zhi, DONG Chenxi, WANG Yao, WANG Jixiao   

  1. State Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of Membrane Science and Desalination Technology, Collaborative Innovation Center of Chemical Science and Engineering(Tianjin), Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
  • Received:2017-07-25 Revised:2017-10-13 Online:2018-02-05 Published:2018-02-05
  • Supported by:

    supported by the Public Science and Technology Research Funds Projects of Ocean (201405009), the National Natural Science Foundation of China (91534124) and the National Science & Technology Pillar Program (2015BAB10B00).

双胍基化聚乙烯胺改性制备抗生物污染反渗透膜

周艺璇, 王志, 董晨曦, 王耀, 王纪孝   

  1. 化学工程联合国家重点实验室, 天津大学化工学院, 化学工程研究所, 天津化学化工协同创新中心, 天津市膜科学与海水淡化技术重点实验室, 天津 300072
  • 通讯作者: 王志
  • 基金资助:

    海洋公益性行业科研专项项目(201405009);国家自然科学基金项目(91534124);国家科技支撑计划项目(2015BAB10B00)。

Abstract:

Membrane bio-fouling is one of the main obstacles for the wide application of reverse osmosis (RO) membrane technology. To solve this problem, a novel anti-bacterial RO membrane was fabricated by second interfacial polymerization of self-synthesized cationic biguanidine functionalized polyvinylamine (PVAmG). Virgin membranes and the polyvinylamine (PVAm)-modified RO membranes were prepared for comparisons. The chemical structures of PVAm and PVAmG were characterized by Fourier transform infrared spectroscopy and elemental analysis. The membranes were systematically characterized by XPS, SEM, AFM, contact angle analyzer and Zeta potential analyzer. The test results show that the modified membranes well maintain the high permselectivity. Moreover, the PVAmG-modified membranes exhibited strong anti-bacterial property (mortalities of 99.9%) against both the Gram-negative Escherichia coli and Gram-positive Bacillus subtilis.

Key words: reverse osmosis membranes, surface modification, second interfacial polymerization, anti-bacterial property, biguanidine functionalized polyvinylamine

摘要:

反渗透作为一种高效、低能耗的膜分离技术,在使用过程中极易受到生物污染的侵袭,造成膜性能不可逆下降。制备具有杀菌功能的反渗透膜可以有效缓解膜生物污染问题。采用二次界面聚合法,将合成的双胍基化聚乙烯胺(PVAmG)阳离子聚合物引入到初生反渗透膜表面,制备出具有杀菌功能的PVAmG改性反渗透膜。结果表明,改性后膜表面的微观形貌和润湿性变化不大,在中性条件下膜表面荷正电。PVAmG改性膜在不降低膜选择透过性能的同时,有效提高了抗生物污染性能。PVAmG改性膜与枯草杆菌和大肠杆菌连续接触4次后,膜面细菌死亡率每次均接近99.9%,表明PVAmG改性膜具有持久的广谱杀菌性。

关键词: 反渗透膜, 表面改性, 二次界面聚合, 抗生物污染, 双胍基化聚乙烯胺

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