Catalytic removal of aqueous contaminants on N-doped graphitic biochars: Inherent roles of adsorption and nonradical mechanism
Green and low-cost catalysts are important for rapid mineralization of organic contaminants in powerful advanced oxidation processes (AOPs). In this study, we reported N-doped graphitic biochars (N-BCs) as low-cost and efficient catalysts for peroxydisulfate (PDS) activation and degradation of diver...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Published: |
American Chemical Society
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/69944 |
| _version_ | 1848762174200086528 |
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| author | Zhu, S. Huang, X. Ma, F. Wang, L. Duan, Xiaoguang Wang, Shaobin |
| author_facet | Zhu, S. Huang, X. Ma, F. Wang, L. Duan, Xiaoguang Wang, Shaobin |
| author_sort | Zhu, S. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Green and low-cost catalysts are important for rapid mineralization of organic contaminants in powerful advanced oxidation processes (AOPs). In this study, we reported N-doped graphitic biochars (N-BCs) as low-cost and efficient catalysts for peroxydisulfate (PDS) activation and degradation of diverse organic pollutants in water treatment including Orange G, phenol, sulfamethoxazole and bisphenol A. The biochars derived from wetland plants at high annealing temperatures (>700 °C) presented highly graphitic nanosheets, large specific surface areas (SSAs), and rich doped nitrogen. In particular, N-BC derived at 900 °C (N-BC900) exhibited the highest degradation rate, which was 39-fold and 6.5-fold of that on N-BC400 and pristine biochar, respectively, and the N-BC900 surpassed most popular metal or nanocarbon catalysts. Different from the radical-based oxidation in N-BC400/PDS via the persistent free radicals (PFRs), singlet oxygen and nonradical pathways (surface-confined activated persulfate/carbon complexes) were discovered to dominate the oxidation processes in N-BC900/PDS. Moreover, the adsorption of organics was determined to be the rate-limiting step, revealing the active sites toward adsorption and catalysis. This study not only provides robust and cheap carbonaceous materials for environmental remediation, but also enables the first insight into the graphitic biochar-based nonradical catalysis. |
| first_indexed | 2025-11-14T10:43:22Z |
| format | Journal Article |
| id | curtin-20.500.11937-69944 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:43:22Z |
| publishDate | 2018 |
| publisher | American Chemical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-699442018-10-05T02:00:23Z Catalytic removal of aqueous contaminants on N-doped graphitic biochars: Inherent roles of adsorption and nonradical mechanism Zhu, S. Huang, X. Ma, F. Wang, L. Duan, Xiaoguang Wang, Shaobin Green and low-cost catalysts are important for rapid mineralization of organic contaminants in powerful advanced oxidation processes (AOPs). In this study, we reported N-doped graphitic biochars (N-BCs) as low-cost and efficient catalysts for peroxydisulfate (PDS) activation and degradation of diverse organic pollutants in water treatment including Orange G, phenol, sulfamethoxazole and bisphenol A. The biochars derived from wetland plants at high annealing temperatures (>700 °C) presented highly graphitic nanosheets, large specific surface areas (SSAs), and rich doped nitrogen. In particular, N-BC derived at 900 °C (N-BC900) exhibited the highest degradation rate, which was 39-fold and 6.5-fold of that on N-BC400 and pristine biochar, respectively, and the N-BC900 surpassed most popular metal or nanocarbon catalysts. Different from the radical-based oxidation in N-BC400/PDS via the persistent free radicals (PFRs), singlet oxygen and nonradical pathways (surface-confined activated persulfate/carbon complexes) were discovered to dominate the oxidation processes in N-BC900/PDS. Moreover, the adsorption of organics was determined to be the rate-limiting step, revealing the active sites toward adsorption and catalysis. This study not only provides robust and cheap carbonaceous materials for environmental remediation, but also enables the first insight into the graphitic biochar-based nonradical catalysis. 2018 Journal Article http://hdl.handle.net/20.500.11937/69944 10.1021/acs.est.8b01817 American Chemical Society restricted |
| spellingShingle | Zhu, S. Huang, X. Ma, F. Wang, L. Duan, Xiaoguang Wang, Shaobin Catalytic removal of aqueous contaminants on N-doped graphitic biochars: Inherent roles of adsorption and nonradical mechanism |
| title | Catalytic removal of aqueous contaminants on N-doped graphitic biochars: Inherent roles of adsorption and nonradical mechanism |
| title_full | Catalytic removal of aqueous contaminants on N-doped graphitic biochars: Inherent roles of adsorption and nonradical mechanism |
| title_fullStr | Catalytic removal of aqueous contaminants on N-doped graphitic biochars: Inherent roles of adsorption and nonradical mechanism |
| title_full_unstemmed | Catalytic removal of aqueous contaminants on N-doped graphitic biochars: Inherent roles of adsorption and nonradical mechanism |
| title_short | Catalytic removal of aqueous contaminants on N-doped graphitic biochars: Inherent roles of adsorption and nonradical mechanism |
| title_sort | catalytic removal of aqueous contaminants on n-doped graphitic biochars: inherent roles of adsorption and nonradical mechanism |
| url | http://hdl.handle.net/20.500.11937/69944 |