Synergetic effects of Bi⁵⁺ and oxygen vacancies in Bismuth(V)-rich Bi₄O₇ nanosheets for enhanced near-infrared light driven photocatalysis
The appropriate energy level position of photocatalysts dominates the photocatalytic redox reaction and utilization efficiency of solar energy for wastewater treatment. Herein, we report a near-infrared (NIR) light driven Bi5+-rich Bi4O7 photocatalyst, achieving a greatly enhanced photocatalytic act...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/160565 |
| _version_ | 1826115964010233856 |
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| author | Liu, Jin Guo, Sheng Wu, Hongzhang Zhang, Xinlei Li, Jun Zhou, Kun |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Liu, Jin Guo, Sheng Wu, Hongzhang Zhang, Xinlei Li, Jun Zhou, Kun |
| author_sort | Liu, Jin |
| collection | NTU |
| description | The appropriate energy level position of photocatalysts dominates the photocatalytic redox reaction and utilization efficiency of solar energy for wastewater treatment. Herein, we report a near-infrared (NIR) light driven Bi5+-rich Bi4O7 photocatalyst, achieving a greatly enhanced photocatalytic activity for pollutant removal compared with Bi3+-replenished Bi2O3. Density functional theory calculations show the formation of an intermediate band in the Bi4O7 structure because of the hybridization of O 2p and Bi 4s orbits. The formation of the intermediate band not only narrows the band gap but also improves the optical absorption property and separation efficiency of the photoinduced carriers. The existence of the oxygen vacancies (OVs) in the Bi4O7 nanosheets ensures high carriers’ concentration, which is verified by the Hall effect test. The synergetic effects of the OVs and Bi5+ greatly accelerate the separation efficiency of the photogenerated carriers. Consequently, the Bi4O7 nanosheets exhibit enhanced NIR light driven photocatalytic activity for the degradation of rhodamine B and ciprofloxacin compared with the bulk Bi2O3. This study paves the way to the design of highly efficient NIR light-responsive Bi-based photocatalysts for environmental purification. |
| first_indexed | 2024-10-01T04:03:41Z |
| format | Journal Article |
| id | ntu-10356/160565 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:03:41Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1605652022-07-26T08:52:49Z Synergetic effects of Bi⁵⁺ and oxygen vacancies in Bismuth(V)-rich Bi₄O₇ nanosheets for enhanced near-infrared light driven photocatalysis Liu, Jin Guo, Sheng Wu, Hongzhang Zhang, Xinlei Li, Jun Zhou, Kun School of Mechanical and Aerospace Engineering Nanyang Environment and Water Research Institute Environmental Process Modelling Centre Engineering::Environmental engineering Near-Infrared Light Oxygen Vacancies The appropriate energy level position of photocatalysts dominates the photocatalytic redox reaction and utilization efficiency of solar energy for wastewater treatment. Herein, we report a near-infrared (NIR) light driven Bi5+-rich Bi4O7 photocatalyst, achieving a greatly enhanced photocatalytic activity for pollutant removal compared with Bi3+-replenished Bi2O3. Density functional theory calculations show the formation of an intermediate band in the Bi4O7 structure because of the hybridization of O 2p and Bi 4s orbits. The formation of the intermediate band not only narrows the band gap but also improves the optical absorption property and separation efficiency of the photoinduced carriers. The existence of the oxygen vacancies (OVs) in the Bi4O7 nanosheets ensures high carriers’ concentration, which is verified by the Hall effect test. The synergetic effects of the OVs and Bi5+ greatly accelerate the separation efficiency of the photogenerated carriers. Consequently, the Bi4O7 nanosheets exhibit enhanced NIR light driven photocatalytic activity for the degradation of rhodamine B and ciprofloxacin compared with the bulk Bi2O3. This study paves the way to the design of highly efficient NIR light-responsive Bi-based photocatalysts for environmental purification. Nanyang Technological University This work is supported by the National Natural Science Foundation of China (No. 21806194), the Outstanding Talent Research Fund of Zhengzhou University (No. 32340099), and the Nanyang Environment and Water Research Institute (Core Fund), Nanyang Technological University, Singapore. 2022-07-26T08:52:49Z 2022-07-26T08:52:49Z 2021 Journal Article Liu, J., Guo, S., Wu, H., Zhang, X., Li, J. & Zhou, K. (2021). Synergetic effects of Bi⁵⁺ and oxygen vacancies in Bismuth(V)-rich Bi₄O₇ nanosheets for enhanced near-infrared light driven photocatalysis. Journal of Materials Science & Technology, 85, 1-10. https://dx.doi.org/10.1016/j.jmst.2021.01.022 1005-0302 https://hdl.handle.net/10356/160565 10.1016/j.jmst.2021.01.022 2-s2.0-85100886378 85 1 10 en Journal of Materials Science & Technology © 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology. All rights reserved. |
| spellingShingle | Engineering::Environmental engineering Near-Infrared Light Oxygen Vacancies Liu, Jin Guo, Sheng Wu, Hongzhang Zhang, Xinlei Li, Jun Zhou, Kun Synergetic effects of Bi⁵⁺ and oxygen vacancies in Bismuth(V)-rich Bi₄O₇ nanosheets for enhanced near-infrared light driven photocatalysis |
| title | Synergetic effects of Bi⁵⁺ and oxygen vacancies in Bismuth(V)-rich Bi₄O₇ nanosheets for enhanced near-infrared light driven photocatalysis |
| title_full | Synergetic effects of Bi⁵⁺ and oxygen vacancies in Bismuth(V)-rich Bi₄O₇ nanosheets for enhanced near-infrared light driven photocatalysis |
| title_fullStr | Synergetic effects of Bi⁵⁺ and oxygen vacancies in Bismuth(V)-rich Bi₄O₇ nanosheets for enhanced near-infrared light driven photocatalysis |
| title_full_unstemmed | Synergetic effects of Bi⁵⁺ and oxygen vacancies in Bismuth(V)-rich Bi₄O₇ nanosheets for enhanced near-infrared light driven photocatalysis |
| title_short | Synergetic effects of Bi⁵⁺ and oxygen vacancies in Bismuth(V)-rich Bi₄O₇ nanosheets for enhanced near-infrared light driven photocatalysis |
| title_sort | synergetic effects of bi⁵⁺ and oxygen vacancies in bismuth v rich bi₄o₇ nanosheets for enhanced near infrared light driven photocatalysis |
| topic | Engineering::Environmental engineering Near-Infrared Light Oxygen Vacancies |
| url | https://hdl.handle.net/10356/160565 |
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