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Luo X, Zhu R, Zhao L, Gong X, Zhang L, Fan L, Liu Y. Defective nitrogen doped carbon material derived from nano-ZIF-8 for enhanced in-situ H 2O 2 generation and tetracycline hydrochloride degradation in electro-Fenton system. ENVIRONMENTAL RESEARCH 2024; 251:118644. [PMID: 38485074 DOI: 10.1016/j.envres.2024.118644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Revised: 02/03/2024] [Accepted: 03/05/2024] [Indexed: 03/19/2024]
Abstract
Tetracycline hydrochloride (TC) accumulates in large quantities in the water environment, causing a serious threat to human health and ecological environment safety. This research focused on developing cost-effective catalysts with high 2e- selectivity for electro-Fenton (EF) technology, a green pollution treatment method. Defective nitrogen-doped porous carbon (d-NPC) was prepared using the metal-organic framework as the precursor to achieve in-situ H2O2 production and self-decomposition into high activity ·OH for degradation of TC combined with Co2+/Co3+. The d-NPC produced 172.1 mg L-1 H2O2 within 120 min, and could degrade 96.4% of TC in EF system. The self-doped defects and graphite-nitrogen in d-NPC improved the oxygen reduction performance and increased the H2O2 yield, while pyridine nitrogen could catalyze H2O2 to generate ·OH. The possible pathway of TC degradation was also proposed. In this study, defective carbon materials were prepared by ball milling, which provided a new strategy for efficient in-situ H2O2 production and the degradation of pollutants.
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Affiliation(s)
- Xuan Luo
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, Sichuan, 610066, China
| | - Ruiying Zhu
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, Sichuan, 610066, China
| | - Li Zhao
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, Sichuan, 610066, China
| | - Xiaobo Gong
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, Sichuan, 610066, China; Key Laboratory of Land Resources Evaluation and Monitoring in Southwest, Ministry of Education, Sichuan Normal University, Chengdu, Sichuan, 610068, China; Key Laboratory of Special Waste Water Treatment, Sichuan Province Higher Education System, Chengdu, Sichuan, 610066, China; Sichuan Provincial Engineering Laboratory of Livestock Manure Treatment and Recycling (Sichuan Normal University), China.
| | - Lingrui Zhang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, Sichuan, 610066, China
| | - Lu Fan
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, Sichuan, 610066, China; Key Laboratory of Land Resources Evaluation and Monitoring in Southwest, Ministry of Education, Sichuan Normal University, Chengdu, Sichuan, 610068, China; Key Laboratory of Special Waste Water Treatment, Sichuan Province Higher Education System, Chengdu, Sichuan, 610066, China.
| | - Yong Liu
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, Sichuan, 610066, China; Key Laboratory of Land Resources Evaluation and Monitoring in Southwest, Ministry of Education, Sichuan Normal University, Chengdu, Sichuan, 610068, China; Key Laboratory of Special Waste Water Treatment, Sichuan Province Higher Education System, Chengdu, Sichuan, 610066, China
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Zhang C, Ye M, Li H, Liu Z, Fu Z, Zhang H, Wang G, Zhang Y. Fe/Fe3C nanoparticles embedded in N-doped porous carbon as the heterogeneous electro-Fenton catalyst for efficient degradation of bisphenol A. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
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Chen Z, Zhang Y, Gu W, Yang M, Yao K, Cao T, Li S. Investigating the electrochemical advanced oxidation mechanism of N-doped graphene aerogel: Molecular dynamics simulation combined with DFT method. ENVIRONMENTAL RESEARCH 2023; 220:115198. [PMID: 36592814 DOI: 10.1016/j.envres.2022.115198] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 12/27/2022] [Accepted: 12/30/2022] [Indexed: 06/17/2023]
Abstract
Nitrogen-doped graphene as a perfectly-efficient and environmentally compatible electrocatalyst won widespread attention in electrochemical advanced oxidation processes (EAOP). However, the relationship between surface structure regulation and activity of catalysts is still lacking in systematic scientific guidance. Herein, nitrogen-doped graphene aerogel (NGA) was conveniently prepared through hydrothermal treatment, and then utilized to fabricate the gas diffusion electrode (GDE) as the cathode for tetracycline (TC) removal. High free radical yield (81.2 μM) and fast reaction rate (0.1469 min-1) were found in NGA system. The molecular dynamics simulation (MD) results showed that the interaction energy of NGA was greater than the raw graphene aerogel (GA). The adsorption activation of H2O2 and the degradation of TC occurred in the first adsorption layer of catalysts, and both processes turned more orderly after nitrogen doping. Moreover, the van der Waals interaction was stronger than the electrostatic interaction. Density function theory (DFT) revealed that the adsorption energy of H2O2 at graphitic N, pyridinic N, and pyrrolic N sites was -0.03 eV, -0.39 eV, and -0.30 eV, respectively. Pyridinic N sites were inferred as the main functional regions of in-situ activation •OH, there were more likely to occur ectopic reaction in pyrrolic N, and graphitic N were responsible for improving H2O2 production. By revealing the microstructure and activation characteristics of NGA, an experiment-simulation complementary strategy is provided in the EAOP to discover or to optimize new catalysts.
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Affiliation(s)
- Zhuang Chen
- School of Water Resources and Hydropower Engineering, North China Electric Power University, Beijing, 102206, China
| | - Yimei Zhang
- MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, China; Laboratory of Environmental Remediation and Functional Material, Suzhou Research Academy of North China Electric Power University, Suzhou, Jiangsu, 215213, China.
| | - Wenwen Gu
- MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, China
| | - Mingwang Yang
- MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, China
| | - Kaiwen Yao
- School of Water Resources and Hydropower Engineering, North China Electric Power University, Beijing, 102206, China.
| | - Ting Cao
- MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, China
| | - Shuai Li
- MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, China
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Gu W, Yang M, Chen Z, Cao T, Zhang Y, Li Y, Zhang R. New insights into enhanced electrochemical advanced oxidation mechanism of B-doped graphene aerogel: Experiments, molecular dynamics simulations and DFT. JOURNAL OF HAZARDOUS MATERIALS 2023; 443:130331. [PMID: 36444056 DOI: 10.1016/j.jhazmat.2022.130331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 10/29/2022] [Accepted: 11/03/2022] [Indexed: 06/16/2023]
Abstract
B-doped graphene, as an efficient and environmental-friendly metal-free catalyst, has aroused much attention in the electrochemical advanced oxidation process (EAOP), but the bottleneck in this field is to determine the relationship between the surface structure regulation and activity of catalysts. Herein, the B-doped graphene aerogel (BGA) fabricated gas diffusion electrode was prepared and used as a cathode for EAOP to remove tetracycline (TC). Higher free radical yield (169.59 μM), faster reaction speed (0.35 min-1) and higher TC removal rate (99.93%) were found in the BGA system. Molecular dynamics simulation unveiled the interaction energy of BGA was greater than the raw graphene aerogel (GA). The adsorption-activation process of H2O2 and the degradation process of TC occurred in the first adsorption layer of catalysts. And both processes turned more orderly after B doping, which accelerated the reaction efficiency. Results of density functional theory displayed the contribution of three B-doped structures to improve the binding strength between H2O2 and BGA was: - BCO2 (-0.23 eV) > - BC2O (-0.16 eV) > - BC3 (-0.09 eV). -BCO2 was inferred to be the main functional region of H2O2 in-situ activation to hydroxyl radical (•OH), while -BC2O and -BC3 were responsible for improving H2O2 production.
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Affiliation(s)
- Wenwen Gu
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China; MOE Key Laboratory of Resources and Environmental Systems Optimization, North China Electric Power University, Beijing 102206, China.
| | - Mingwang Yang
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China; MOE Key Laboratory of Resources and Environmental Systems Optimization, North China Electric Power University, Beijing 102206, China.
| | - Zhuang Chen
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China; MOE Key Laboratory of Resources and Environmental Systems Optimization, North China Electric Power University, Beijing 102206, China.
| | - Ting Cao
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China; MOE Key Laboratory of Resources and Environmental Systems Optimization, North China Electric Power University, Beijing 102206, China.
| | - Yimei Zhang
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China; MOE Key Laboratory of Resources and Environmental Systems Optimization, North China Electric Power University, Beijing 102206, China.
| | - Yingfeng Li
- School of New Energy, North China Electric Power University, Beijing 102206, China.
| | - Ranran Zhang
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China; MOE Key Laboratory of Resources and Environmental Systems Optimization, North China Electric Power University, Beijing 102206, China.
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Zhang T, Sun L, Sun X, Dong H, Yu H, Yu H. Radical and non-radical cooperative degradation in metal-free electro-Fenton based on nitrogen self-doped biochar. JOURNAL OF HAZARDOUS MATERIALS 2022; 435:129063. [PMID: 35650745 DOI: 10.1016/j.jhazmat.2022.129063] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2022] [Revised: 04/17/2022] [Accepted: 04/30/2022] [Indexed: 06/15/2023]
Abstract
To achieve sustainable metal-free electron-Fenton, N self-doped biochar air-cathode (BCAC) was prepared by pyrolyzing coffee residues. During the pyrolysis process, the endogenous N transformed from edge-doping to graphite-doping. Particularly, N vacancies started to evolve when the peak temperature exceeded 700 °C. A high Tetracycline removal rate of 70.42% was obtained on the BCAC at the current density of 4 mA cm-2. Quenching tests incorporated with ESR spectroscopy were adopted to identify the specific oxidants produced on the cathode. The results showed that •OH (37.36%), •O2- (29.67%) and 1O2 (24.17%) played comparable role in the tetracycline removal, suggesting the coexist of radical and non-radical oxidants in our electro-Fenton system. According to the structure characterization and the DFT calculation, graphitic N was suggested as the critical site for H2O2 generation, and both graphitic N and pyridinic N were electroactive sites for H2O2 activation to •OH. Graphitic N and N vacancies with stronger capabilities in O2 adsorption and electron-trapping were proposed as the electroactive sites for 1O2 and •O2- formation. This work predicts a novel electro-Fenton process with cooperative radical and non-radical degradation on N self-doped carbonaceous catalysts at a mild condition, which is extremely meaningful for boosting sustainable electro-Fenton technology.
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Affiliation(s)
- Ting Zhang
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China
| | - Lu Sun
- Institute of Modern Optics, Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology, Nankai University, Tianjin 300350, China
| | - Xiaohong Sun
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China
| | - Heng Dong
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China.
| | - Han Yu
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China; Department of Water Resources Engineering, Lund University, Lund 22100, Sweden
| | - Hongbing Yu
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China
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Thor SH, Ho LN, Ong SA, Abidin CZA, Heah CY, Ong YP, Yap KL. A sustainable photocatalytic fuel cell integrated photo-electro-Fenton hybrid system using KOH activated carbon felt cathodes for enhanced Amaranth degradation and electricity generation. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121041] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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Pan Z, Xin H, Xu S, Xu R, Wang P, Yuan Y, Fan X, Song Y, Song C, Wang T. Preparation and performance of polyaniline modified coal-based carbon membrane for electrochemical filtration treatment of organic wastewater. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.120600] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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