Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 21, Pages 24708-24719Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c04988
Keywords
photocatalysis; nanofiltration membrane; integrated filtration-degradation; antifouling performance; antibacterial activity; recyclability
Funding
- National Natural Science Foundation of China [31901274]
- 13th China Special Postdoctoral Science Foundation [2020T130303]
- Postdoctoral Research Foundation of China [2019M661854]
- Jiangsu Postdoctoral Research Foundation [2019K142]
- Natural Science Foundation of Jiangsu Province for Outstanding Young Scholars [BK20180090]
- 333 Project Foundation of Jiangsu Province [BRA2018337]
- Qing Lan Project of Jiangsu Province (2019)
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This study investigated a new nanofiltration membrane and its performance. The membrane achieved excellent self-cleaning properties by loading Ag/AgBr/AgVO3 heterojunction, and the filtration and degradation processes constantly promoted each other, resulting in higher treatment efficiency than individual processes.
A nanofiltration (NF) membrane containing a NaOH-treated electrospun polyacrylonitrile (HPAN) substrate, an interfacial polymerization (IP) polyamide (PA) layer, a chitosan (CS) coating layer, and an Ag/AgBr/AgVO3 photocatalyst loading layer was prepared. The structural evolution of the membranes was investigated, and their performance was estimated in accordance with the water flux and rejection rate. A probable mechanism for the photocatalytic activity of Ag/AgBr/AgVO3 was proposed. The loading of the Ag/AgBr/AgVO3 heterojunction on the HPAN/PA/CS NF membrane endowed the membrane with excellent self-cleaning properties owing to the photolytic degradation of the dye. The filtration and degradation processes of the Ag/AgBr/AgVO3-loaded membrane constantly promoted each other, and the treatment efficiency achieved with the integrated (filtration + degradation) process was superior to those obtained with the filtration and degradation processes alone. The Ag/AgBr/AgVO3-NF membrane exhibited excellent recyclability and stability when subjected to five integrated filtration-degradation processes. In addition, the Ag/AgBr/AgVO3-NF membrane exhibited an elastic modulus of 65.75 MPa and a toughness of 38.9 kJ/m(3) along with a good disinfection effect on Escherichia coli in visible light. The as-prepared photocatalyst-loaded NF membrane with excellent antifouling performance, antimicrobial activity, high strength, and recyclability showed potential for continuous water purification operation.
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