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Frontiers of Chemical Science and Engineering

2021, Volume 15,  Issue 1, Pages 109-117
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    Reductant-assisted polydopamine-modified membranes for efficient water purification

    . Key Laboratory of Marine Chemistry Theory and Technology (Ministry of Education), School of Materials Science and Engineering, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.. National Center of Ocean Standards and Metrology, Tianjin 300112, China

    Received：2020-09-18 Accepted： 2020-10-29 Available online：2020-10-29
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    10.1007/s11705-020-1987-9
    Cite this article
    Feng Sun, Jinren Lu, Yuhong Wang, Jie Xiong, Congjie Gao, Jia Xu.Reductant-assisted polydopamine-modified membranes for efficient water purification[J].Frontiers of Chemical Science and Engineering,2021,15(1):109-117.

    Abstract

    Surface engineering with polydopamine coatings has been considered a promising surface functionalisation tool. However, it is difficult to control the self-polymerisation for polydopamine formation, which usually causes severe interparticle aggregation. In this study, polydopamine self-polymerisation was controlled by adjusting its reducing environment using a reductant (NaBH ) to fabricate mixed cellulose ester (MCE)/polydopamine membranes. An oxidising environment using NaIO was additionally tested as the control. The results showed that a thin polydopamine coating with small polydopamine particles was formed on the skeleton frameworks of the MCE membrane with NaBH , and the self-polymerisation rate was suppressed. The polydopamine coating formed in the reducing environment facilitated excellent water transport performance with a water permeance of approximately 400 L·m ·h ·bar as well as efficient organic foulant removal with a bovine serum albumin rejection of approximately 90%. In addition, the polydopamine coating with NaBH exhibited both excellent chemical stability and anti-microbial activity, demonstrating the contribution of the reducing environment to the performance of the MCE/polydopamine membranes. It shows significant potential for use in water purification.

    Keywords

    membrane ; water purification ; polydopamine ; reducing environment ; self-polymerization control
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