BiOBr@UiO-66 photocatalysts with abundant activated sites for the enhanced photodegradation of rhodamine b under visible light irradiation

In this work, bismuth bromideoxide (BiOBr), a typical visible-light photocatalyst, was coated with Zr-based MOFs (UiO-66) to prepare the BiOBr@UiO-66 photocatalysts with different mole ratios by the solvothermal method. The core–shell BiOBr@UiO-66 photocatalysts with abundant activated sites was obt...

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Bibliographic Details
Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2021-09, Vol.271, p.115297, Article 115297
Main Authors: Tian, Hailin, Gu, Yan, Zhou, Houle, Huang, Yingping, Fang, Yanfen, Li, Ruiping, Tang, Changcun
Format: Article
Language:English
Subjects:
BiOBr/UiO-66
Bismuth
Catalytic activity
Energy bands
Holes (electron deficiencies)
Light irradiation
Organic pollutants
Photocatalysis
Photocatalysts
Photodegradation
Recyclability
Rhodamine
Synergistic effect
Visible light irradiation
Zirconium
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Summary:In this work, bismuth bromideoxide (BiOBr), a typical visible-light photocatalyst, was coated with Zr-based MOFs (UiO-66) to prepare the BiOBr@UiO-66 photocatalysts with different mole ratios by the solvothermal method. The core–shell BiOBr@UiO-66 photocatalysts with abundant activated sites was obtained due to the modification of UiO-66 on the surface of BiOBr. The structure and properties of the BiOBr@UiO-66 photocatalysts were characterized by several methods. The 30% BiOBr@UiO-66 photocatalysts exhibited the biggest photodegradation rate constant (k = 0.0669 min−1) for RhB under visible-light irradiation than pure BiOBr (k = 0.0281 min−1) and UiO-66 (k = 0.0041 min−1). Additionally, the 30% BiOBr@UiO-66 photocatalysts exhibited the enhanced photocatalytic activity and stable recyclability due to the effective electron-hole separation and synergistic effect. The photocatalytic mechanism of the BiOBr@UiO-66 photocatalysts for RhB, which contained a photosensitization process, was discussed with the trapping experiment of active species and the proposed energy band alignments.
ISSN:0921-5107
1873-4944
DOI:10.1016/j.mseb.2021.115297