期刊
APPLIED SURFACE SCIENCE
卷 567, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2021.150765
关键词
BiOBrxI1-x; Oxygen vacancies; Defect catalysis; Multiple reactive species; Antibacterial activity
类别
资金
- National Natural Science Foundation of China [51972288, 51672258, 52002360]
- Fundamental Research Funds for the Central Universities [2652018287, 2652018290]
Semiconductor photocatalysis faces limitations in terms of location and time. BiOBrxI1-x solid solutions with oxygen vacancies (OVs) prepared by direct precipitation exhibit efficient catalytic performance for degrading tetracycline hydrochloride and killing Escherichia coli in the dark. BiOBr0.93I0.07 prepared in ethylene glycol shows the most prominent catalytic activity, and the catalysts can be regenerated in-situ by UV light after prolonged use.
Semiconductor photocatalysis suffers from geographical and temporal limitations. Here, BiOBrxI1-x solid solutions with oxygen vacancies (OVs) prepared by facile direct-precipitation are applied as efficient catalysts without light. The rapid crystallization process enables OVs easily to be formed in BiOBrxI1-x, and the OVs concentration is well-modulated by controlling the solvent type and solid solution composition. All BiOBrxI1-x demonstrate OVs-triggered catalytic performance for degrading tetracycline hydrochloride and killing Escherichia coli in the dark. BiOBr0.93I0.07 prepared in ethylene glycol exhibits the most prominent catalytic activity, which is attributed to the suitable OVs concentration and favorable band structure that benefit the generation of multiple reactive species (superoxide radicals, holes and hydroxyl radicals) and promoting the charge separation. Additionally, OVs depleted after a long period of time can be in-situ regenerated for sustained long term catalysis by irradiating the catalysts with UV light. This work is expected to facilitate the development of defect-activated catalytic reaction in the dark.
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