Au@CoS-BiVO4 {010} constructed for visible-light-assisted peroxymonosulfate activation

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Publikationsdatum
2021-11-22
Autor:innen
Ji, Yekun
Zhou, Ye
Wang, Jinnan
Li, Aimin
Bian, Weilin
Corvini, Philippe
Zeitschriftentitel
ISSN der Zeitschrift
Bandtitel
Verlag
MDPI
Zusammenfassung
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.
Beschreibung
Schlagwörter
CoS-Au-BiVO4 {010}, Visible-light-assisted peroxymonosulfate activation, Spatial charge separation, Electron sink, Heterostructure
Zitierform
DOI der Originalpublikation
Zitation
JI, Yekun, Ye ZHOU, Jinnan WANG, Aimin LI, Weilin BIAN und Philippe CORVINI, 2021. Au@CoS-BiVO4 {010} constructed for visible-light-assisted peroxymonosulfate activation. Catalysts. 22 November 2021. Bd. 11, Nr. 1414. DOI 10.3390/catal11111414. Verfügbar unter: https://doi.org/10.26041/fhnw-4128

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