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: | , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/bebebdf9e9dd4c25a5d52182286eb6d2 |
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| Sumario: | 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. |
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