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Insights into the Electron-Transfer Mechanism of Permanganate Activation by Graphite for Enhanced Oxidation of Sulfamethoxazole
Abstract
Abstract Many reagents as electron sacrificers have been recently investigated to induce decomposition of permanganate (KMnO4) to produce highly reactive intermediate Mn species toward oxidation of organic contaminants; however, this strategy meanwhile causes low KMnO4 utilization efficiency. This study surprisingly found that graphite can mediate direct electron transfer from organics (e.g., sulfamethoxazole (SMX)) to KMnO4, resulting in high KMnO4 utilization efficiency, rather than reductive sites of graphite-induced conversion of KMnO4 to highly reactive intermediate Mn species. The galvanic oxidation process (GOP) and comparative experiments of different organic contaminants prove that the KMnO4/graphite system mainly extracts electrons from organic contaminants via a one-electron pathway instead of a two-electron pathway. More importantly, the KMnO4/graphite system has superior reusability, graphite can keep a long-lasting reactivity, and the KMnO4 utilization efficiency elevates significantly after each cycle of graphite. The transformation of SMX in the KMnO4/graphite system mainly includes self-coupling, hydroxylation, oxidation, and hydrolytic reaction. The work will improve insights into the electron-transfer mechanism and unveil the advantages of efficient KMnO4 utilization in the KMnO4-based technologies in environmental remediation.
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Cites
Yun, E.-T., Lee, J. H., Kim, J., Park, H.-D., & Lee, J. (2018) · Environmental Science & Technology · doi:10.1021/acs.est.8b00959 · Cited by 1,175
Cited by
Meng, Y., Liu, Y.-Q., Wang, C., Si, Y., Wang, Y.-J., Xia, W.-Q., Liu, T., Cao, X., Guo, Z.-Y., Chen, J.-J., et al. (2024) · Nature Communications · doi:10.1038/s41467-024-49605-2 · Cited by 336
Huang, B., Wu, Z., Wang, X., Song, X., Zhou, H., Zhang, H., Zhou, P., Liu, W., Xiong, Z., & Lai, B. (2023) · Environmental Science & Technology · doi:10.1021/acs.est.3c05509 · Cited by 281
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Metadata
- Authors
- Peng, J., Zhou, P., Zhou, H., Liu, W., Zhang, H., Zhou, C., Lai, L., Ao, Z., Su, S., & Lai, B.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2021-05-28
- Volume
- 55
- Issue
- 13
- Pages
- 9189-9198
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W3165242037
- Cited by
- 285
- References
- 1
- FWCI
- 13.37
- Type
- journal article
- Language
- en
- Open access
- closed
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- Peng, J., Zhou, P., Zhou, H., Liu, W., Zhang, H., Zhou, C., Lai, L., Ao, Z., Su, S., & Lai, B. (2021). Insights into the Electron-Transfer Mechanism of Permanganate Activation by Graphite for Enhanced Oxidation of Sulfamethoxazole. Environmental Science & Technology. https://doi.org/10.1021/acs.est.1c00020
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