期刊
CHEMICAL ENGINEERING JOURNAL
卷 361, 期 -, 页码 1352-1362出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.12.181
关键词
Photocatalytic mechanism; Plasmonic photocatalyst; Simultaneous removal
资金
- National Natural Science Foundation of China [51808250, 51472101]
- Natural Science Foundation of Jiangsu Province of China [BK20181070, BK20160430]
- China Postdoctoral Science Foundation [2017M610336, 2016M591757]
- Jiangsu Planned Projects for Postdoctoral Research Funds [1601179C]
- Huaian Key Research and Development Program of China [HAS201601]
- Huaian Natural Science Research Program [HAB201830]
- Key University Science Research Project of Jiangsu Province [11KJA150004, 13KJB150007]
Herein, we demonstrate the successful construction of a novel flowerlike Ag/p-Ag2O/n-BiVO4 plasmonic photocatalyst for the photocatalytic oxidation of BPA and reduction of chromium(VI) simultaneously under visible light irradiation. Among these samples, 2mM-Ag/p-Ag2O/n-BiVO4 exhibits the highest photocatalytic performances. The photocatalytic reduction and oxidation efficiency can achieve 69.8 and 91.9%, respectively, after 100 min visible-light irradiation. The enhancement mechanism for the plasmonic photocatalyst is explored, which can be attributed to the enhanced absorbance in the visible light region, and the facilitated charge transfer and the suppressed recombination of electron-hole pairs in the Ag/p-Ag2O/n-BiVO4. The results of the electrochemical impedance spectroscopy, the fluorescence emission spectra and the time-resolved fluorescence emission decay spectra indicate the enhanced charge separation in the Ag/p-Ag2O/n-BiVO4 plasmonic photocatalyst. In addition, the free radical scavenging test shows that h+ and % center dot OH radicals play crucial roles in the photocatalytic oxidation reaction. The photogenerated electrons in the photocatalytic reduction process, are confirmed by the DMPO spin-trapping technology. Moreover, the band structures of various photocatalysts are revealed via the valence band XPS spectra and the Fermi level obtained by CASTEP code.
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