NDLI: $Au@CoS-BiVO_{4}$ {010} Constructed for Visible-Light-Assisted Peroxymonosulfate Activation

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$Au@CoS-BiVO_{4}$ {010} Constructed for Visible-Light-Assisted Peroxymonosulfate Activation

Content Provider	MDPI
Author	Ji, Yekun Zhou, Ye Wang, Jinnan Li, Aimin Bian, Weilin Corvini, Philippe François-Xavier
Copyright Year	2021
Description	A visible-light-Fenton-like reaction system was constructed for the selective conversion of peroxymonosulfate to sulfate radical. Au@CoS, when doped on monoclinic $BiVO_{4}$ {010} facets, promoted spatial charge separation due to the different energy band between the $m-BiVO_{4}$ {010} and {110} facets. The visible-light response of $m-BiVO_{4}$ was enhanced, which was attributed to the SPR effect of Au. And the photogenerated electrons were transferred from the $m-BiVO_{4}$ {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 $(Co^{2+}$ + HSO_{5}$^{−}$→ $Co^{3+}$ + •SO_{4}$^{−}$ + $OH^{−}$). On the other hand, holes accumulated on $m-BiVO_{4}$ {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), $CoS-Au-BiVO_{4}$ loaded on glass fiber showed a high mineralization rate (>60%) of practical wastewater.
Starting Page	1414
e-ISSN	20734344
DOI	10.3390/catal11111414
Journal	Catalysts
Issue Number	11
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-11-22
Access Restriction	Open
Subject Keyword	Catalysts Environmental Engineering Environmental Sciences Visible-light-assisted Peroxymonosulfate Activation Cos-au-bivo4 {010} Spatial Charge Separation Electron Sink Heterostructure
Content Type	Text
Resource Type	Article

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