Improved solar energy photoactivity over defective BiOBr ultrathin nanosheets towards pollutant removal and oxygen evolution
Defective BiOBr nanosheets with ultrathin thickness and surface-confined pits have been synthesized through a dual control of cetyltrimethylammonium bromide (CTAB) and polyvinyl pyrrolidone (PVP). The photocatalytic activity of the obtained defective BiOBr nanosheets was evaluated for the removal of...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2021
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/150708 |
| _version_ | 1826125499830632448 |
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| author | Wu, Weibin Zhang, Zhenbang Di, Jun Zhao, Wenfeng |
| author2 | School of Materials Science and Engineering |
| author_facet | School of Materials Science and Engineering Wu, Weibin Zhang, Zhenbang Di, Jun Zhao, Wenfeng |
| author_sort | Wu, Weibin |
| collection | NTU |
| description | Defective BiOBr nanosheets with ultrathin thickness and surface-confined pits have been synthesized through a dual control of cetyltrimethylammonium bromide (CTAB) and polyvinyl pyrrolidone (PVP). The photocatalytic activity of the obtained defective BiOBr nanosheets was evaluated for the removal of rhodamine B (RhB), ciprofloxacin (CIP) and oxygen evolution from water. The as-prepared defective BiOBr nanosheets displayed significantly increased activity for pollutant degradation and oxygen evolution. The enhanced photocatalytic activity was ascribed to the improved light harvesting, suppression of charge recombination, and an increase in the number of active sites for photocatalytic reaction. The electronic structure of the defective BiOBr ultrathin nanosheets with confined pits has been tuned and thus varied the photocatalytic mechanism for pollutant degradation. The active species have changed from hole for BiOBr nanoplates to superoxide radical (O2.−) and hole for defective BiOBr nanosheets determined by ESR analysis and trapping experiments. |
| first_indexed | 2024-10-01T06:37:37Z |
| format | Journal Article |
| id | ntu-10356/150708 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:37:37Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1507082021-06-08T01:54:24Z Improved solar energy photoactivity over defective BiOBr ultrathin nanosheets towards pollutant removal and oxygen evolution Wu, Weibin Zhang, Zhenbang Di, Jun Zhao, Wenfeng School of Materials Science and Engineering Centre for Programmable Materials Engineering::Materials BiOBr Defects Defective BiOBr nanosheets with ultrathin thickness and surface-confined pits have been synthesized through a dual control of cetyltrimethylammonium bromide (CTAB) and polyvinyl pyrrolidone (PVP). The photocatalytic activity of the obtained defective BiOBr nanosheets was evaluated for the removal of rhodamine B (RhB), ciprofloxacin (CIP) and oxygen evolution from water. The as-prepared defective BiOBr nanosheets displayed significantly increased activity for pollutant degradation and oxygen evolution. The enhanced photocatalytic activity was ascribed to the improved light harvesting, suppression of charge recombination, and an increase in the number of active sites for photocatalytic reaction. The electronic structure of the defective BiOBr ultrathin nanosheets with confined pits has been tuned and thus varied the photocatalytic mechanism for pollutant degradation. The active species have changed from hole for BiOBr nanoplates to superoxide radical (O2.−) and hole for defective BiOBr nanosheets determined by ESR analysis and trapping experiments. 2021-06-08T01:54:24Z 2021-06-08T01:54:24Z 2019 Journal Article Wu, W., Zhang, Z., Di, J. & Zhao, W. (2019). Improved solar energy photoactivity over defective BiOBr ultrathin nanosheets towards pollutant removal and oxygen evolution. ChemNanoMat, 5(2), 215-223. https://dx.doi.org/10.1002/cnma.201800553 2199-692X 0000-0002-6232-6466 https://hdl.handle.net/10356/150708 10.1002/cnma.201800553 2-s2.0-85058712601 2 5 215 223 en ChemNanoMat © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved. |
| spellingShingle | Engineering::Materials BiOBr Defects Wu, Weibin Zhang, Zhenbang Di, Jun Zhao, Wenfeng Improved solar energy photoactivity over defective BiOBr ultrathin nanosheets towards pollutant removal and oxygen evolution |
| title | Improved solar energy photoactivity over defective BiOBr ultrathin nanosheets towards pollutant removal and oxygen evolution |
| title_full | Improved solar energy photoactivity over defective BiOBr ultrathin nanosheets towards pollutant removal and oxygen evolution |
| title_fullStr | Improved solar energy photoactivity over defective BiOBr ultrathin nanosheets towards pollutant removal and oxygen evolution |
| title_full_unstemmed | Improved solar energy photoactivity over defective BiOBr ultrathin nanosheets towards pollutant removal and oxygen evolution |
| title_short | Improved solar energy photoactivity over defective BiOBr ultrathin nanosheets towards pollutant removal and oxygen evolution |
| title_sort | improved solar energy photoactivity over defective biobr ultrathin nanosheets towards pollutant removal and oxygen evolution |
| topic | Engineering::Materials BiOBr Defects |
| url | https://hdl.handle.net/10356/150708 |
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