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Enhanced photocatalytic degradation by higher exposure of {110} facet and surface oxygen vacancies of BiOBr through cobalt doping strategy.
- Source :
-
Colloids & Surfaces A: Physicochemical & Engineering Aspects . Apr2024, Vol. 687, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- Transition metal cobalt doped BiOBr (Co-BOB) was successfully synthesized by using hydrothermal method. The optimized Co-BOB achieved a remarkable rhodamine B degradation rate of 97 % in 30 min under visible light irradiation when initial concentration was 80 mg·L−1. Satisfactory removal efficiency was also observed under ambient sunlight irradiation and various water conditions. The cobalt doping strategy induced abundant surface oxygen vacancies formation (43.22 %) and resulted in an increasing exposure of {110} facets. The photosensitization and photocatalytic activities of Co-BOB significantly enhanced comparing with that of pure BiOBr. The synergy of Co doping and oxygen vacancies also induced the formation of a new band structure in Co-BOB. The synergistic effect promoted the efficient separation of photogenerated electrons and holes. By combining with density functional theory calculation, the RhB photocatalytic degradation mechanism by Co-BOB was proposed. [Display omitted] • Trace amounts of cobalt contributed to the formation of abundant surface oxygen vacancies in BOB. • The photocatalytic degradation efficiency of Co-BOB under visible light irradiation achieved 97 % for 80 mg·L−1 RhB solution. • DFT calculation indicated that the mid-energy levels of Co-BOB were induced by cobalt atoms and oxygen vacancies. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09277757
- Volume :
- 687
- Database :
- Academic Search Index
- Journal :
- Colloids & Surfaces A: Physicochemical & Engineering Aspects
- Publication Type :
- Academic Journal
- Accession number :
- 176099280
- Full Text :
- https://doi.org/10.1016/j.colsurfa.2024.133402