期刊
MEMBRANES
卷 9, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/membranes9030036
关键词
electrodialysis; antimicrobial; anion exchange membrane; permselectivity
类别
资金
- Natural Science Foundation of China [21676249]
- National Natural Science Foundation of China [21878273]
- National Key Research and Development Plan [2017YFC0403701]
- Project for Assistance of Qinghai from Science Technology Department of Zhejiang Province [2018C26004]
A facile membrane surface modification process for improving permselectivity and antimicrobial property was proposed. A polydopamine (PDA) coating was firstly fabricated on pristine anion exchange membrane (AEM), followed by in situ reduction of Ag without adding any extra reductant. Finally, 2,5-diaminobenzene sulfonic acid (DSA) was grafted onto PDA layer via Michael addition reaction. The as-prepared AEM exhibited improved permselectivity (from 0.60 to 1.43) and effective inhibition of bacterial growth. In addition, the result of the long-term (90-h continuous electrodialysis) test expressed the excellent durability of the modified layer on membrane surface, because the concentration of Cl- and SO42- in diluted chamber fluctuated similar to 0.024 and 0.030 mol center dot L-1 with no distinct decline. The method described in this work makes the full use of multifunctional PDA layer (polymer-like coating, in situ reduction and post-organic reaction), and a rational design of functional AEM was established for better practical application.
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