Metal-free catalytic ozonation on surface-engineered graphene: Microwave reduction and heteroatom doping
© 2018 Elsevier B.V. N-doped graphene has demonstrated exceptional activities in versatile metal-free catalytic processes. In this study, reduced graphene oxide (rGO) and N-doped rGO were synthesized by a facile approach via microwave reduction with a low energy input and short reaction time. The ac...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Published: |
Elsevier BV
2019
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| Online Access: | http://hdl.handle.net/20.500.11937/71378 |
| _version_ | 1848762463851380736 |
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| author | Wang, Y. Cao, H. Chen, C. Xie, Y. Sun, Hongqi Duan, Xiaoguang Wang, Shaobin |
| author_facet | Wang, Y. Cao, H. Chen, C. Xie, Y. Sun, Hongqi Duan, Xiaoguang Wang, Shaobin |
| author_sort | Wang, Y. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2018 Elsevier B.V. N-doped graphene has demonstrated exceptional activities in versatile metal-free catalytic processes. In this study, reduced graphene oxide (rGO) and N-doped rGO were synthesized by a facile approach via microwave reduction with a low energy input and short reaction time. The activities of the derived carbocatalysts were evaluated by catalytic ozonation of 4-nitrophenol (4-NP). Compared with thermally annealed rGOs in argon atmosphere, microwave treated rGO demonstrated a better performance in catalytic oxidation, and N-doping would further improve the catalytic activity. It is discovered that microwave irradiation not only gave rise to more edging sites and dangling bonds in rGO, making higher catalytic potentials for ozone decomposition than that from thermal annealing, but also resulted in a higher concentration of N dopants. XPS studies revealed that more graphitic N species were incorporated into the carbon basal plane during the microwave reduction processes. The reactive oxygen species (ROS) in 4-NP oxidation were evaluated and identified by liquid-phase electron spin resonance (ESR) and radical scavenging tests, which indicated the generation of O2[rad]-, [rad]OH and1O2for 4-NP degradation. This study provides a facile protocol for fabricating advanced nanocarbon materials for green oxidation and enables new insights in catalytic ozonation with state-of-the-art carbocatalysis. |
| first_indexed | 2025-11-14T10:47:58Z |
| format | Journal Article |
| id | curtin-20.500.11937-71378 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:47:58Z |
| publishDate | 2019 |
| publisher | Elsevier BV |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-713782018-12-13T09:34:50Z Metal-free catalytic ozonation on surface-engineered graphene: Microwave reduction and heteroatom doping Wang, Y. Cao, H. Chen, C. Xie, Y. Sun, Hongqi Duan, Xiaoguang Wang, Shaobin © 2018 Elsevier B.V. N-doped graphene has demonstrated exceptional activities in versatile metal-free catalytic processes. In this study, reduced graphene oxide (rGO) and N-doped rGO were synthesized by a facile approach via microwave reduction with a low energy input and short reaction time. The activities of the derived carbocatalysts were evaluated by catalytic ozonation of 4-nitrophenol (4-NP). Compared with thermally annealed rGOs in argon atmosphere, microwave treated rGO demonstrated a better performance in catalytic oxidation, and N-doping would further improve the catalytic activity. It is discovered that microwave irradiation not only gave rise to more edging sites and dangling bonds in rGO, making higher catalytic potentials for ozone decomposition than that from thermal annealing, but also resulted in a higher concentration of N dopants. XPS studies revealed that more graphitic N species were incorporated into the carbon basal plane during the microwave reduction processes. The reactive oxygen species (ROS) in 4-NP oxidation were evaluated and identified by liquid-phase electron spin resonance (ESR) and radical scavenging tests, which indicated the generation of O2[rad]-, [rad]OH and1O2for 4-NP degradation. This study provides a facile protocol for fabricating advanced nanocarbon materials for green oxidation and enables new insights in catalytic ozonation with state-of-the-art carbocatalysis. 2019 Journal Article http://hdl.handle.net/20.500.11937/71378 10.1016/j.cej.2018.08.134 Elsevier BV restricted |
| spellingShingle | Wang, Y. Cao, H. Chen, C. Xie, Y. Sun, Hongqi Duan, Xiaoguang Wang, Shaobin Metal-free catalytic ozonation on surface-engineered graphene: Microwave reduction and heteroatom doping |
| title | Metal-free catalytic ozonation on surface-engineered graphene: Microwave reduction and heteroatom doping |
| title_full | Metal-free catalytic ozonation on surface-engineered graphene: Microwave reduction and heteroatom doping |
| title_fullStr | Metal-free catalytic ozonation on surface-engineered graphene: Microwave reduction and heteroatom doping |
| title_full_unstemmed | Metal-free catalytic ozonation on surface-engineered graphene: Microwave reduction and heteroatom doping |
| title_short | Metal-free catalytic ozonation on surface-engineered graphene: Microwave reduction and heteroatom doping |
| title_sort | metal-free catalytic ozonation on surface-engineered graphene: microwave reduction and heteroatom doping |
| url | http://hdl.handle.net/20.500.11937/71378 |