Journal
CATALYSIS TODAY
Volume 332, Issue -, Pages 227-235Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2018.07.024
Keywords
Photocatalysis; g-C3N4; Ag nanoparticles; Degradation; Disinfection; Visible light
Funding
- National Natural Science Foundation of China [21707052, 21607034]
- China Postdoctoral Science Foundation [2016M601718]
- Key Research and Development Program of Jiangsu Province [BE2017623]
- Fundamental Research Funds for the Central Universities [JUSRP51714B]
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Herein, Ag nanoparticles (AgNPs) were loaded on oxidized porous g-C3N4 (PCNO) via photo-assisted reduction method. Compared with PCNO, Ag/PCNO plasmonic photocatalysts possessed remarkably enhanced photocatalytic performances in both pollutant degradation and disinfection under visible light irradiation. The optimum photocatalytic activity of Ag/PCNO at a loading amount of 2.0 wt% (Ag-2/PCNO) on amaranth degradation was almost 2.4 times as fast as that of PCNO. Additionally, Ag-2/PCNO could inactivate about 99.4% of Staphylococcus aureus (S. aureus) cells after 3 h of irradiation, whereas only about 29.6% of S. aureus cells were inactivated by PCNO. The enhancement of photocatalytic activities for Ag/PCNO composites could be ascribed to the combination of the SPR effect of AgNPs and the synergistic effect from PCNO molecules, which resulted in enhanced absorption in visible-light region, improved charge transfer, and reduced charge recombination. Moreover, h(+) and center dot O-2(-) were the dominate reactive species for Ag/PCNO composites to remove azo pigments and pathogenic bacteria efficiently during the photocatalytic process.
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