Thermal stability, microstructure and photocatalytic activity of the bismuth oxybromide photocatalyst
Flake BiOBr was first prepared by a solution method at room temperature. Then, the produced BiOBr was calcined at different temperatures. It was found that BiOBr is not a stable compound. It transforms to plate-like Bi 24O 31Br 11at around 750°C and the formed Bi 24O 31Br 11 can further convert to r...
| Main Authors: | , , , , |
|---|---|
| Format: | Journal Article |
| Published: |
2012
|
| Online Access: | http://hdl.handle.net/20.500.11937/40088 |
| _version_ | 1848755770976370688 |
|---|---|
| author | Yu, C. Zhou, W. Yu, J. Cao, F. Li, Xin Yong |
| author_facet | Yu, C. Zhou, W. Yu, J. Cao, F. Li, Xin Yong |
| author_sort | Yu, C. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Flake BiOBr was first prepared by a solution method at room temperature. Then, the produced BiOBr was calcined at different temperatures. It was found that BiOBr is not a stable compound. It transforms to plate-like Bi 24O 31Br 11at around 750°C and the formed Bi 24O 31Br 11 can further convert to rod-like a-Bi 2O 3 at around 850°C. The prepared compounds were characterized with X-ray diffraction (XRD), N 2physical adsorption, scanning electron microscopy (SEM), and UV-Vis diffuse reflectance spectra (DRS), respectively. The photocatalytic activity of the produced bismuth oxybromides was evaluated by photocatalytic decomposition of acid orange II under both visible light (?>420 nm) and UV light (?=365 nm) irradiation. Results show that these compounds have different band gaps and different photocatalytic properties. The band gap energies of the as-prepared samples were found to be 2.82, 2.79, 2.60 and 3.15 eV for BiOBr, BiOBr/Bi 24O 31Br, Bi 24O 31Br, and a-Bi 2O 3, respectively. Under both UV light and visible light irradiation, the photocatalytic activity follows the order: BiOBr/Bi 24O 31Br mixture>BiOBr>Bi 24O 31Br>a-Bi 2O 3. The change in photocatalytic activity could be attributed to the different light absorption ability and microstructures of the photocatalysts. © 2012 SIOC, CAS, Shanghai, & WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. |
| first_indexed | 2025-11-14T09:01:36Z |
| format | Journal Article |
| id | curtin-20.500.11937-40088 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:01:36Z |
| publishDate | 2012 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-400882017-09-13T15:08:56Z Thermal stability, microstructure and photocatalytic activity of the bismuth oxybromide photocatalyst Yu, C. Zhou, W. Yu, J. Cao, F. Li, Xin Yong Flake BiOBr was first prepared by a solution method at room temperature. Then, the produced BiOBr was calcined at different temperatures. It was found that BiOBr is not a stable compound. It transforms to plate-like Bi 24O 31Br 11at around 750°C and the formed Bi 24O 31Br 11 can further convert to rod-like a-Bi 2O 3 at around 850°C. The prepared compounds were characterized with X-ray diffraction (XRD), N 2physical adsorption, scanning electron microscopy (SEM), and UV-Vis diffuse reflectance spectra (DRS), respectively. The photocatalytic activity of the produced bismuth oxybromides was evaluated by photocatalytic decomposition of acid orange II under both visible light (?>420 nm) and UV light (?=365 nm) irradiation. Results show that these compounds have different band gaps and different photocatalytic properties. The band gap energies of the as-prepared samples were found to be 2.82, 2.79, 2.60 and 3.15 eV for BiOBr, BiOBr/Bi 24O 31Br, Bi 24O 31Br, and a-Bi 2O 3, respectively. Under both UV light and visible light irradiation, the photocatalytic activity follows the order: BiOBr/Bi 24O 31Br mixture>BiOBr>Bi 24O 31Br>a-Bi 2O 3. The change in photocatalytic activity could be attributed to the different light absorption ability and microstructures of the photocatalysts. © 2012 SIOC, CAS, Shanghai, & WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. 2012 Journal Article http://hdl.handle.net/20.500.11937/40088 10.1002/cjoc.201280018 restricted |
| spellingShingle | Yu, C. Zhou, W. Yu, J. Cao, F. Li, Xin Yong Thermal stability, microstructure and photocatalytic activity of the bismuth oxybromide photocatalyst |
| title | Thermal stability, microstructure and photocatalytic activity of the bismuth oxybromide photocatalyst |
| title_full | Thermal stability, microstructure and photocatalytic activity of the bismuth oxybromide photocatalyst |
| title_fullStr | Thermal stability, microstructure and photocatalytic activity of the bismuth oxybromide photocatalyst |
| title_full_unstemmed | Thermal stability, microstructure and photocatalytic activity of the bismuth oxybromide photocatalyst |
| title_short | Thermal stability, microstructure and photocatalytic activity of the bismuth oxybromide photocatalyst |
| title_sort | thermal stability, microstructure and photocatalytic activity of the bismuth oxybromide photocatalyst |
| url | http://hdl.handle.net/20.500.11937/40088 |