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Reductant-assisted polydopamine-modified membranes for efficient water purification
Frontiers of Chemical Science and Engineering ( IF 4.3 ) Pub Date : 2020-10-30 , DOI: 10.1007/s11705-020-1987-9
Feng Sun , Jinren Lu , Yuhong Wang , Jie Xiong , Congjie Gao , Jia Xu

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 (NaBH4) to fabricate mixed cellulose ester (MCE)/polydopamine membranes. An oxidising environment using NaIO4 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 NaBH4, 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−2 · h−1 · bar−1 as well as efficient organic foulant removal with a bovine serum albumin rejection of approximately 90%. In addition, the polydopamine coating with NaBH4 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.



中文翻译:

还原剂辅助的聚多巴胺改性膜可有效净化水

聚多巴胺涂层的表面工程被认为是一种很有前途的表面功能化工具。但是,难以控制聚多巴胺形成的自聚合,这通常会引起严重的颗粒间聚集。在这项研究中,通过使用还原剂(NaBH 4)调节其还原环境来控制聚多巴胺的自聚合反应,以制造混合纤维素酯(MCE)/聚多巴胺膜。另外测试了使用NaIO 4的氧化环境作为对照。结果表明,在带有NaBH 4的MCE膜的骨架上形成了带有小聚多巴胺颗粒的薄聚多巴胺涂层。,并且自聚合速率被抑制。在还原性环境中形成的聚多巴胺涂层促进了卓越的水传输性能,水渗透率约为400 L·m -2 ·h -1 ·bar -1,并且有效去除有机污垢,牛血清白蛋白排斥率约为90% 。另外,具有NaBH 4的聚多巴胺涂层表现出优异的化学稳定性和抗微生物活性,证明了还原环境对MCE /聚多巴胺膜性能的贡献。它显示出在水净化中的巨大潜力。

更新日期:2020-10-30
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