Au@CoS-BiVO<sub>4</sub> {010} Constructed for Visible-Light-Assisted Peroxymonosulfate Activation

Au@CoS-BiVO<sub>4</sub> {010} Constructed for Visible-Light-Assisted Peroxymonosulfate Activation

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<sub>4</sub> {010} facets, promoted spatial charge separation due to the different energy band between the m-BiVO<sub&...

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Autores principales: Yekun Ji, Ye Zhou, Jinnan Wang, Aimin Li, Weilin Bian, Philippe François-Xavier Corvini
Formato: article
Lenguaje:EN
Publicado: MDPI AG 2021
Materias:
visible-light-assisted peroxymonosulfate activation
CoS-Au-BiVO<sub>4</sub> {010}
spatial charge separation
electron sink
heterostructure
Chemical technology
TP1-1185
Chemistry
QD1-999
Acceso en línea:https://doaj.org/article/bebebdf9e9dd4c25a5d52182286eb6d2
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spelling oai:doaj.org-article:bebebdf9e9dd4c25a5d52182286eb6d22021-11-25T17:07:02ZAu@CoS-BiVO<sub>4</sub> {010} Constructed for Visible-Light-Assisted Peroxymonosulfate Activation10.3390/catal111114142073-4344https://doaj.org/article/bebebdf9e9dd4c25a5d52182286eb6d22021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1414https://doaj.org/toc/2073-4344A visible-light-Fenton-like reaction system was constructed for the selective conversion of peroxymonosulfate to sulfate radical. Au@CoS, when doped on monoclinic BiVO<sub>4</sub> {010} facets, promoted spatial charge separation due to the different energy band between the m-BiVO<sub>4</sub> {010} and {110} facets. The visible-light response of m-BiVO<sub>4</sub> was enhanced, which was attributed to the SPR effect of Au. And the photogenerated electrons were transferred from the m-BiVO<sub>4</sub> {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<sup>2+</sup> + HSO<sub>5</sub><sup>−</sup>→ Co<sup>3+</sup> + •SO<sub>4</sub><sup>−</sup> + OH<sup>−</sup>). On the other hand, holes accumulated on m-BiVO<sub>4</sub> {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<sub>4</sub> loaded on glass fiber showed a high mineralization rate (>60%) of practical wastewater.Yekun JiYe ZhouJinnan WangAimin LiWeilin BianPhilippe François-Xavier CorviniMDPI AGarticlevisible-light-assisted peroxymonosulfate activationCoS-Au-BiVO<sub>4</sub> {010}spatial charge separationelectron sinkheterostructureChemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1414, p 1414 (2021)
institution DOAJ
collection DOAJ
language EN
topic visible-light-assisted peroxymonosulfate activation
CoS-Au-BiVO<sub>4</sub> {010}
spatial charge separation
electron sink
heterostructure
Chemical technology
TP1-1185
Chemistry
QD1-999
spellingShingle visible-light-assisted peroxymonosulfate activation
CoS-Au-BiVO<sub>4</sub> {010}
spatial charge separation
electron sink
heterostructure
Chemical technology
TP1-1185
Chemistry
QD1-999
Yekun Ji
Ye Zhou
Jinnan Wang
Aimin Li
Weilin Bian
Philippe François-Xavier Corvini
Au@CoS-BiVO<sub>4</sub> {010} Constructed for Visible-Light-Assisted Peroxymonosulfate Activation
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<sub>4</sub> {010} facets, promoted spatial charge separation due to the different energy band between the m-BiVO<sub>4</sub> {010} and {110} facets. The visible-light response of m-BiVO<sub>4</sub> was enhanced, which was attributed to the SPR effect of Au. And the photogenerated electrons were transferred from the m-BiVO<sub>4</sub> {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<sup>2+</sup> + HSO<sub>5</sub><sup>−</sup>→ Co<sup>3+</sup> + •SO<sub>4</sub><sup>−</sup> + OH<sup>−</sup>). On the other hand, holes accumulated on m-BiVO<sub>4</sub> {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<sub>4</sub> loaded on glass fiber showed a high mineralization rate (>60%) of practical wastewater.
format article
author Yekun Ji
Ye Zhou
Jinnan Wang
Aimin Li
Weilin Bian
Philippe François-Xavier Corvini
author_facet Yekun Ji
Ye Zhou
Jinnan Wang
Aimin Li
Weilin Bian
Philippe François-Xavier Corvini
author_sort Yekun Ji
title Au@CoS-BiVO<sub>4</sub> {010} Constructed for Visible-Light-Assisted Peroxymonosulfate Activation
title_short Au@CoS-BiVO<sub>4</sub> {010} Constructed for Visible-Light-Assisted Peroxymonosulfate Activation
title_full Au@CoS-BiVO<sub>4</sub> {010} Constructed for Visible-Light-Assisted Peroxymonosulfate Activation
title_fullStr Au@CoS-BiVO<sub>4</sub> {010} Constructed for Visible-Light-Assisted Peroxymonosulfate Activation
title_full_unstemmed Au@CoS-BiVO<sub>4</sub> {010} Constructed for Visible-Light-Assisted Peroxymonosulfate Activation
title_sort au@cos-bivo<sub>4</sub> {010} constructed for visible-light-assisted peroxymonosulfate activation
publisher MDPI AG
publishDate 2021
url https://doaj.org/article/bebebdf9e9dd4c25a5d52182286eb6d2
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