Nitrogen-Doped Graphene for Generation and Evolution of Reactive Radicals by Metal-Free Catalysis
N-Doped graphene (NG) nanomaterials were synthesized by directly annealing graphene oxide (GO) with a novel nitrogen precursor of melamine. A high N-doping level, 8-11 at. %, was achieved at a moderate temperature. The sample of NG-700, obtained at a calcination temperature of 700°C, showed the high...
| Main Authors: | , , , , , , , , |
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| Format: | Journal Article |
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American Chemical Society
2015
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| Online Access: | http://purl.org/au-research/grants/arc/DP130101319 http://hdl.handle.net/20.500.11937/45800 |
| _version_ | 1848757385505538048 |
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| author | Duan, X. Ao, Z. Sun, Hongqi Indrawirawan, S. Wang, Yuxian Kang, J. Liang, F. Zhu, John Wang, Shaobin |
| author_facet | Duan, X. Ao, Z. Sun, Hongqi Indrawirawan, S. Wang, Yuxian Kang, J. Liang, F. Zhu, John Wang, Shaobin |
| author_sort | Duan, X. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | N-Doped graphene (NG) nanomaterials were synthesized by directly annealing graphene oxide (GO) with a novel nitrogen precursor of melamine. A high N-doping level, 8-11 at. %, was achieved at a moderate temperature. The sample of NG-700, obtained at a calcination temperature of 700°C, showed the highest efficiency in degradation of phenol solutions by metal-free catalytic activation of peroxymonosulfate (PMS). The catalytic activity of the Ndoped rGO (NG-700) was about 80 times higher than that of undoped rGO in phenol degradation. Moreover, the activity of NG-700 was 18.5 times higher than that of the most popular metal-based catalyst of nanocrystalline Co3O4 in PMS activation. Theoretical calculations using spin-unrestricted density functional theory (DFT) were carried out to probe the active sites for PMS activation on Ndopedgraphene. In addition, experimental detection of generated radicals using electron paramagnetic resonance (EPR) and competitive radical reactions was performed to reveal the PMS activation processes and pathways of phenol degradation on nanocarbons. It was observed that both •OH and SO4 •- existed in the oxidation processes and played critical roles for phenol oxidation. |
| first_indexed | 2025-11-14T09:27:15Z |
| format | Journal Article |
| id | curtin-20.500.11937-45800 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:27:15Z |
| publishDate | 2015 |
| publisher | American Chemical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-458002022-10-06T06:32:00Z Nitrogen-Doped Graphene for Generation and Evolution of Reactive Radicals by Metal-Free Catalysis Duan, X. Ao, Z. Sun, Hongqi Indrawirawan, S. Wang, Yuxian Kang, J. Liang, F. Zhu, John Wang, Shaobin N-Doped graphene (NG) nanomaterials were synthesized by directly annealing graphene oxide (GO) with a novel nitrogen precursor of melamine. A high N-doping level, 8-11 at. %, was achieved at a moderate temperature. The sample of NG-700, obtained at a calcination temperature of 700°C, showed the highest efficiency in degradation of phenol solutions by metal-free catalytic activation of peroxymonosulfate (PMS). The catalytic activity of the Ndoped rGO (NG-700) was about 80 times higher than that of undoped rGO in phenol degradation. Moreover, the activity of NG-700 was 18.5 times higher than that of the most popular metal-based catalyst of nanocrystalline Co3O4 in PMS activation. Theoretical calculations using spin-unrestricted density functional theory (DFT) were carried out to probe the active sites for PMS activation on Ndopedgraphene. In addition, experimental detection of generated radicals using electron paramagnetic resonance (EPR) and competitive radical reactions was performed to reveal the PMS activation processes and pathways of phenol degradation on nanocarbons. It was observed that both •OH and SO4 •- existed in the oxidation processes and played critical roles for phenol oxidation. 2015 Journal Article http://hdl.handle.net/20.500.11937/45800 10.1021/am508416n http://purl.org/au-research/grants/arc/DP130101319 American Chemical Society restricted |
| spellingShingle | Duan, X. Ao, Z. Sun, Hongqi Indrawirawan, S. Wang, Yuxian Kang, J. Liang, F. Zhu, John Wang, Shaobin Nitrogen-Doped Graphene for Generation and Evolution of Reactive Radicals by Metal-Free Catalysis |
| title | Nitrogen-Doped Graphene for Generation and Evolution of Reactive Radicals by Metal-Free Catalysis |
| title_full | Nitrogen-Doped Graphene for Generation and Evolution of Reactive Radicals by Metal-Free Catalysis |
| title_fullStr | Nitrogen-Doped Graphene for Generation and Evolution of Reactive Radicals by Metal-Free Catalysis |
| title_full_unstemmed | Nitrogen-Doped Graphene for Generation and Evolution of Reactive Radicals by Metal-Free Catalysis |
| title_short | Nitrogen-Doped Graphene for Generation and Evolution of Reactive Radicals by Metal-Free Catalysis |
| title_sort | nitrogen-doped graphene for generation and evolution of reactive radicals by metal-free catalysis |
| url | http://purl.org/au-research/grants/arc/DP130101319 http://hdl.handle.net/20.500.11937/45800 |