BiOBr@UiO-66 photocatalysts with abundant activated sites for the enhanced photodegradation of rhodamine b under visible light irradiation
| Autor: | Yingping Huang, Yan Gu, Hailin Tian, Changcun Tang, Ruiping Li, Houle Zhou, Yanfen Fang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Mechanical Engineering Visible light irradiation chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Photochemistry 01 natural sciences 0104 chemical sciences Bismuth chemistry.chemical_compound Reaction rate constant chemistry Mechanics of Materials Photocatalysis Rhodamine B General Materials Science Irradiation 0210 nano-technology Photodegradation |
| Zdroj: | Materials Science and Engineering: B. 271:115297 |
| ISSN: | 0921-5107 |
| DOI: | 10.1016/j.mseb.2021.115297 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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