Underneath mechanisms into the super effective degradation of PFOA by BiOF nanosheets with tunable oxygen vacancies on exposed (101) facets

[Display omitted] •BiOF photocatalysts with tunable OVs on the (101) facets were facilely prepared.•Enhanced charge transfer and charge-separation states led to high activity.•An intermediate band was created to lower energy required for electron transition.•The primary attack sites of various activ...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2021-06, Vol.286, p.119911, Article 119911
Main Authors: Wang, Jingzhen, Cao, Chunshuai, Zhang, Ying, Zhang, Yinqing, Zhu, Lingyan
Format: Article
Language:English
Subjects:
Bismuth oxyhalide
Catalytic activity
Degradation
Electron transfer
Electron transitions
Ethylene glycol
Exposure
Molecular oxygen activation
Nanosheets
Oxygen
Oxygen vacancy
Perfluorooctanoic acid
Photocatalysis
Photocatalysts
Pollutants
Surface defects
Vacancies
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Summary:[Display omitted] •BiOF photocatalysts with tunable OVs on the (101) facets were facilely prepared.•Enhanced charge transfer and charge-separation states led to high activity.•An intermediate band was created to lower energy required for electron transition.•The primary attack sites of various active species were unveiled by DFT simulation. Construction of surface defects or/and exposed reactive facets is a promising strategy to improve the performance of photocatalysts. In this study, BiOF photocatalysts with tunable oxygen vacancies on the exposed (101) facets were successfully prepared by adjusting the concentration of ethylene glycol (EG). The prepared product with 50 % EG in the solution displayed remarkable photocatalytic activity for the recalcitrant pollutant perfluorooctanoic acid (PFOA), which could be completely decomposed within 6 h. The appropriate concentration of oxygen vacancy and the exposed (101) facets synergistically promoted the electron transfer from the defective surface to O2. Moreover, the oxygen vacancy introduced an intermediate band, which narrowed the bandgap and lowered the energy required for electron transition. DFT calculations and LC-MS-MS results revealed the principal-attack-sites of various active substances and figure out the entire PFOA degradation pathways. These profound findings are instrumental for a comprehensive understanding of the degradation process of PFOA in photocatalytic systems.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2021.119911