4.8 Article

Ultrathin nanoflake-assembled hierarchical BiOBr microflower with highly exposed {001} facets for efficient photocatalytic degradation of gaseous ortho-dichlorobenzene

期刊

APPLIED CATALYSIS B-ENVIRONMENTAL
卷 281, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.apcatb.2020.119478

关键词

Surface structure; Photocatalytic process; BiOBr; In situ FTIR; Oxygen defects

资金

  1. Major Program of the National Natural Science Foundation of China [21590813]
  2. National Natural Science Foundation of China [21377015, 21577012]
  3. Key Project of the National Ministry of Science and Technology [2016YFC0204204]
  4. Program of Introducing Talents of Discipline to Universities [B13012]
  5. Key Laboratory of Industrial Ecology and Environmental Engineering, China Ministry of Education

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A series of BiOBr catalysts with different microstructures were synthesized by adjusting solvothermal conditions. The hierarchical BiOBr microflower (BiOBr MF) was found to be the most efficient in promoting charge carrier separation and migration, leading to superior photocatalytic activity in the degradation of gaseous ortho-dichlorobenzene (o-DCB) under visible light irradiation. The enhanced charge transfer mechanism was revealed through energy band structures and reactive oxygen species analysis.
A series of BiOBr catalysts with different microstructures were synthesized by tuning the solvothermal conditions. Assisted by the surface photovoltage, transient photovoltage and time-resolved photoluminescence techniques, the photoexcited charge carriers separation and transfer dynamics were comparatively investigated. The results indicated that the hierarchical BiOBr microflower (BiOBr MF) consisting of well-organized ultrathin nanoflakes were most efficient in promoting charge carrier separation and migration, resulting from the nearly 100 % {001} facets exposed with more oxygen defects. Furthermore, the photocatalytic performance was estimated through the degradation of gaseous ortho-dichlorobenzene (o-DCB) under visible light irradiation, and the BiOBr MF exhibited superior photoactivity. The enhanced mechanism underlying the charge transfer was disclosed by the energy band structures and the reactive oxygen species which were examined by room temperature electron spin resonance. In addition, the catalytic oxidation process of o-DCB over the BiOBr MF and the corresponding surface intermediates was revealed by in situ FTIR spectroscopy.

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