Au@CoS-BiVO4 {010} constructed for visible-light-assisted peroxymonosulfate activation
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22.11.2021
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01A - Journal article
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Catalysts
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11
Issue / Number
1414
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MDPI
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Abstract
A visible-light-Fenton-like reaction system was constructed for the selective conversion of peroxymonosulfate to sulfate radical. Au@CoS, when doped on monoclinic BiVO4 {010} facets, promoted spatial charge separation due to the different energy band between the m-BiVO4 {010} and {110} facets. The visible-light response of m-BiVO4 was enhanced, which was attributed to the SPR effect of Au. And the photogenerated electrons were transferred from the m-BiVO4 {010} facet to Au via a Schottky junction. Owing to higher work function, CoS was able to capture these photoelectrons with acceleration of the Co(Ⅱ)/Co(Ⅲ) redox, enhancing peroxymonosulfate conversion to sulfate radical (Co2+ + HSO5−→ Co3+ + •SO4− + OH−). On the other hand, holes accumulated on m-BiVO4 {110} facets also contributed to organics oxidation. Thus, more than 95% of RhB was degraded within 40 min, and, even after five cycles, over 80% of RhB could be removed. The radical trapping experiments and EPR confirmed that both the sulfate radical and photogenerated hole were the main species for organics degradation. UV-vis DRS, photoluminescence (PL) and photoelectrochemical analyses also confirmed the enhancement of the visible-light response and charge separation. In a pilot scale experiment (PMS = 3 mM, initial TOC = 151 mg/L, reaction time = 4 h), CoS-Au-BiVO4 loaded on glass fiber showed a high mineralization rate (>60%) of practical wastewater.
Keywords
CoS-Au-BiVO4 {010}, Visible-light-assisted peroxymonosulfate activation, Spatial charge separation, Electron sink, Heterostructure
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2073-4344
Language
English
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Yes
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Published
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Citation
Ji, Y., Zhou, Y., Wang, J., Li, A., Bian, W., & Corvini, P. (2021). Au@CoS-BiVO4 {010} constructed for visible-light-assisted peroxymonosulfate activation. Catalysts, 11(1414). https://doi.org/10.3390/catal11111414