Temperature dependent photocatalysis of g-C3N4, TiO2 and ZnO: Differences in photoactive mechanism
Photocatalysis has been believed as one of the green and sustainable avenues to address energy and environmental crises by converting solar energy to chemical energy via reactions. Temperature is usually a vital factor controlling kinetics and thermodynamics of a reaction, but it has been less inves...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Published: |
Academic Press
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/72891 |
| _version_ | 1848762869780316160 |
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| author | Meng, F. Liu, Y. Wang, J. Tan, X. Sun, Hongqi Liu, Shaomin Wang, Shaobin |
| author_facet | Meng, F. Liu, Y. Wang, J. Tan, X. Sun, Hongqi Liu, Shaomin Wang, Shaobin |
| author_sort | Meng, F. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Photocatalysis has been believed as one of the green and sustainable avenues to address energy and environmental crises by converting solar energy to chemical energy via reactions. Temperature is usually a vital factor controlling kinetics and thermodynamics of a reaction, but it has been less investigated in photocatalysis. In this work, the effect of reaction temperature on photocatalysis was investigated in a simple process, photocatalytic degradation of Congo Red (CR) on three typical catalysts, g-C3N4, TiO2 and ZnO, to differentiate the interfacial radical generation and reaction mechanism. The results showed that the temperature has a positive effect on the photocatalytic activity of the three catalysts. The scavenger experiments at various temperatures indicated that the generation of reactive species from the three photocatalysts is different and that the free radicals can be produced more quickly at higher temperatures, causing improved activities in photocatalysis. However, photocurrent analysis and EIS at various temperatures showed that the temperature had a different effect on recombination rate and transfer barriers of the charge carriers from each catalyst. Therefore, the dramatic enhancement in photodegradation activities probably originated from a novel mechanism of the photothermocatalytic oxidation. The interfacial reaction and mechanism from the influence of reaction temperature on the photocatalytic process was proposed. |
| first_indexed | 2025-11-14T10:54:25Z |
| format | Journal Article |
| id | curtin-20.500.11937-72891 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:54:25Z |
| publishDate | 2018 |
| publisher | Academic Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-728912019-02-11T01:16:03Z Temperature dependent photocatalysis of g-C3N4, TiO2 and ZnO: Differences in photoactive mechanism Meng, F. Liu, Y. Wang, J. Tan, X. Sun, Hongqi Liu, Shaomin Wang, Shaobin Photocatalysis has been believed as one of the green and sustainable avenues to address energy and environmental crises by converting solar energy to chemical energy via reactions. Temperature is usually a vital factor controlling kinetics and thermodynamics of a reaction, but it has been less investigated in photocatalysis. In this work, the effect of reaction temperature on photocatalysis was investigated in a simple process, photocatalytic degradation of Congo Red (CR) on three typical catalysts, g-C3N4, TiO2 and ZnO, to differentiate the interfacial radical generation and reaction mechanism. The results showed that the temperature has a positive effect on the photocatalytic activity of the three catalysts. The scavenger experiments at various temperatures indicated that the generation of reactive species from the three photocatalysts is different and that the free radicals can be produced more quickly at higher temperatures, causing improved activities in photocatalysis. However, photocurrent analysis and EIS at various temperatures showed that the temperature had a different effect on recombination rate and transfer barriers of the charge carriers from each catalyst. Therefore, the dramatic enhancement in photodegradation activities probably originated from a novel mechanism of the photothermocatalytic oxidation. The interfacial reaction and mechanism from the influence of reaction temperature on the photocatalytic process was proposed. 2018 Journal Article http://hdl.handle.net/20.500.11937/72891 10.1016/j.jcis.2018.07.131 Academic Press restricted |
| spellingShingle | Meng, F. Liu, Y. Wang, J. Tan, X. Sun, Hongqi Liu, Shaomin Wang, Shaobin Temperature dependent photocatalysis of g-C3N4, TiO2 and ZnO: Differences in photoactive mechanism |
| title | Temperature dependent photocatalysis of g-C3N4, TiO2 and ZnO: Differences in photoactive mechanism |
| title_full | Temperature dependent photocatalysis of g-C3N4, TiO2 and ZnO: Differences in photoactive mechanism |
| title_fullStr | Temperature dependent photocatalysis of g-C3N4, TiO2 and ZnO: Differences in photoactive mechanism |
| title_full_unstemmed | Temperature dependent photocatalysis of g-C3N4, TiO2 and ZnO: Differences in photoactive mechanism |
| title_short | Temperature dependent photocatalysis of g-C3N4, TiO2 and ZnO: Differences in photoactive mechanism |
| title_sort | temperature dependent photocatalysis of g-c3n4, tio2 and zno: differences in photoactive mechanism |
| url | http://hdl.handle.net/20.500.11937/72891 |