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Sam DK, Cao Y. Iron-Cobalt Nanoparticles Embedded in B,N-Doped Chitosan-Derived Porous Carbon Aerogel for Overall Water Splitting. ACS APPLIED MATERIALS & INTERFACES 2024; 16:32311-32321. [PMID: 38870486 DOI: 10.1021/acsami.4c06141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2024]
Abstract
Given their intriguing properties, porous carbons have surfaced as promising electrocatalysts for various energy conversion reactions. This study presents a unique approach where iron-cobalt (FeCo) is confined in a boron, nitrogen-doped chitosan-derived porous carbon aerogel (BNPC-FeCo) to serve as an electrocatalyst for the hydrogen evolution and oxygen evolution reactions (HER and OER). The BNPC-FeCo-900 electrocatalyst demonstrates excellent catalyst activity, with very low overpotentials of 186 and 320 mV at 10 mA cm-2, low Tafel slopes of 82 and 55 mV dec-1, and low charge transfer resistance of 2.68 and 9.25 Ω for HER and OER, respectively. Density functional theory (DFT) calculations further reveal that the cooperation between the boron, nitrogen codoped porous carbon, and the FeCo nanoparticles reduces intermediates' energy barriers, significantly enhancing the HER and OER performance. In conclusion, this work offers significant and informative perspectives into the potential of porous carbon materials as dual-purpose electrocatalysts for water splitting.
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Affiliation(s)
- Daniel Kobina Sam
- School of Energy Science and Engineering, University of Science and Technology of China, Guangzhou 510640, China
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
- CAS Key Laboratory of Renewable Energy, Guangzhou 510640, China
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
| | - Yan Cao
- School of Energy Science and Engineering, University of Science and Technology of China, Guangzhou 510640, China
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
- CAS Key Laboratory of Renewable Energy, Guangzhou 510640, China
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
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Wang C, Zhou S, Wang X, Tan W, Feng X. Photocatalytic activation of sulfite by maghemite (γ-Fe 2O 3) for iohexol degradation and alleviation effect of HCO 3- on water acidification. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 346:123557. [PMID: 38355082 DOI: 10.1016/j.envpol.2024.123557] [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: 12/08/2023] [Revised: 01/27/2024] [Accepted: 02/10/2024] [Indexed: 02/16/2024]
Abstract
Photo-catalyzing sulfite (S(IV)) for the generation of sulfate radical (SO4•-) has emerged as a novel advanced oxidation process (AOP) recently. However, both the potential of soil minerals as effective photocatalysts and the process of water acidification due to S(IV) oxidation have been overlooked. Herein, maghemite (γ-Fe2O3), a typical soil iron oxide with excellent photocatalytic reactivity like hematite and magnetic-collectible property like magnetite, was successfully used to activate S(IV) for iohexol degradation under visible light irradiation. As a result, 91.3% of iohexol was eliminated within 15 min at 0.1 g/L maghemite and 0.5 mM S(IV) under neutral conditions. The influencing factors, including initial pH, catalyst dosage, S(IV) amount, co-existing substances and water matrix, were systematically investigated. The maghemite/S(IV)/vis system exhibited superior performance in iohexol degradation at a wide pH range (3-10). It was found that the released proton via S(IV) oxidation led to severe water acidification. Interestingly, a low dose of HCO3- could evidently resist water acidification with little influence on iohexol elimination. Radical quenching experiments and electron spin resonance (ESR) analysis confirmed that SO4•-, •OH and •O2- were involved in iohexol abatement with SO4•- being the dominant reactive species. Compared with hydrogen peroxide, persulfate and peroxymonosulfate, the established maghemite/S(IV)/vis system achieved much more remarkable degradation performance. Furthermore, the reactivity of the catalyst was not obviously reduced even after 10 runs of reaction. This study expands the application of soil iron oxide mineral in S(IV) activation in water treatment and proposes an approach to regulate water acidification in S(IV)-based AOP.
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Affiliation(s)
- Cheng Wang
- Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs of the People's Republic of China, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, People's Republic of China
| | - Shuijing Zhou
- Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs of the People's Republic of China, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, People's Republic of China
| | - Xiaoming Wang
- Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs of the People's Republic of China, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, People's Republic of China
| | - Wenfeng Tan
- Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs of the People's Republic of China, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, People's Republic of China
| | - Xionghan Feng
- Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs of the People's Republic of China, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, People's Republic of China.
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Zhou Y, Yao B, Yuan Y, Hu W, Liu J, Zou H, Zhou Y. Enhancement of Fenton processes at initial circumneutral pH for the degradation of norfloxacin with Fe@FeS core-shell nanowires. ENVIRONMENTAL TECHNOLOGY 2023; 44:2451-2461. [PMID: 35084294 DOI: 10.1080/09593330.2022.2033329] [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: 11/28/2021] [Accepted: 01/15/2022] [Indexed: 06/08/2023]
Abstract
The disadvantages of narrow working pH range (2.5-4.0), accumulation of iron sludge and incomplete degradation have hindered the practical application of the traditional homogeneous Fenton technique. In this research, Fe@FeS core-shell nanowires were synthesised and the innovative Fe@FeS/Fe2+/H2O2 system was adopted for norfloxacin (NOR) degradation at an initial circumneutral pH. More than 95% NOR has been removed in the Fe@FeS/Fe2+/H2O2 system within 30 min at pH 7. After investigating the concentration change of total iron, Fe2+ and H2O2 during the degradation process, NOR degradation in the Fe@FeS/Fe2+/H2O2 system might be attributed to the combined effect of homogeneous Fenton reaction and heterogeneous Fenton process. Besides that, the added Fe@FeS has accelerated Fe3+/Fe2+ redox cycle with extremely high degree. The generated reactive ●OH has been identified by electron paramagnetic resonance spectrometer results, possible degradation intermediates have also been proposed according to Gas chromatography-mass spectrometry analysis results. Moreover, Fe@FeS core-shell nanowires showed excellent reusability, it is a promising heterogeneous Fenton catalyst that is applicable for practical application.
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Affiliation(s)
- Yuzhou Zhou
- College of Resources and Environment, Hunan Agricultural University, Changsha, People's Republic of China
| | - Bin Yao
- College of Resources and Environment, Hunan Agricultural University, Changsha, People's Republic of China
| | - Yawen Yuan
- College of Resources and Environment, Hunan Agricultural University, Changsha, People's Republic of China
| | - Wenyong Hu
- College of Biological Resources and Environmental Science, Jishou University, Jishou, People's Republic of China
| | - Jingyi Liu
- College of Biological Resources and Environmental Science, Jishou University, Jishou, People's Republic of China
| | - Huanwei Zou
- College of Resources and Environment, Hunan Agricultural University, Changsha, People's Republic of China
| | - Yaoyu Zhou
- College of Resources and Environment, Hunan Agricultural University, Changsha, People's Republic of China
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Zhu J, Ma J, Liu L, Zhang S, Zhao L, Jin H, Zhang K. Carbon supported "core-shell structure" of Fe nanoparticles for enhanced Fenton reaction activity and magnetic separation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:7207-7217. [PMID: 36031677 DOI: 10.1007/s11356-022-22754-x] [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: 02/22/2022] [Accepted: 08/23/2022] [Indexed: 06/15/2023]
Abstract
Effectively facilitating Fe3+/Fe2+ cycles and expanding its operating pH range are keys to optimizing the traditional Fenton reaction. In this exploration, we used chitosan and ferrous sulfate as precursors to prepare a multicomponent magnetic Fe/C Fenton-like catalyst, which exhibited extraordinary catalytic properties and excellent stability performance in a pH range of 4~8. Besides, it could be easily separated from the solution by a magnet. The characterization showed that the supported Fe species include troilite-2H (FeS), lepidocrocite (FeOOH), and pyrrhotite-6T (Fe1 - xS) with a unique "core-shell structure." The presence of reductive iron sulfide core in the system can accelerate the reduction of Fe(III). Meanwhile, the graphite-like structure formed after calcination can adsorb and enrich priority pollutants near the active site through π-π coupling and strengthen electron transfer, which endows its high catalytic performance and enables it invulnerable to dissolved organic compounds.
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Affiliation(s)
- Jiahao Zhu
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, 310058, China
- School of Civil Engineering and Architecture, NingboTech University, Ningbo, 315100, China
| | - Jianqing Ma
- School of Civil Engineering and Architecture, NingboTech University, Ningbo, 315100, China.
- Ningbo Research Institute, Zhejiang University, Ningbo, 315100, China.
| | - Liang Liu
- Blue City Ecological Co., Ltd., Ningbo, 315100, China
| | - Shali Zhang
- School of Civil Engineering and Architecture, NingboTech University, Ningbo, 315100, China
| | - Liaoyuan Zhao
- Blue City Ecological Co., Ltd., Ningbo, 315100, China
| | - Huixia Jin
- School of Civil Engineering and Architecture, NingboTech University, Ningbo, 315100, China
- Ningbo Research Institute, Zhejiang University, Ningbo, 315100, China
| | - Kefeng Zhang
- School of Civil Engineering and Architecture, NingboTech University, Ningbo, 315100, China
- Ningbo Research Institute, Zhejiang University, Ningbo, 315100, China
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Yang J, Huang R, Cao Y, Wang H, Ivanets A, Wang C. Heterogeneous Fenton degradation of persistent organic pollutants using natural chalcopyrite: effect of water matrix and catalytic mechanism. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:75651-75663. [PMID: 35657557 DOI: 10.1007/s11356-022-21105-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Accepted: 05/22/2022] [Indexed: 06/15/2023]
Abstract
Natural chalcopyrite was evaluated as heterogeneous Fenton catalyst. Catalytic performance was evaluated considering different systems, catalyst dosage, H2O2 concentration, and reaction temperature, and increasing the parameters favors rhodamine B degradation. Effect of aqueous matrix was systematically examined, involving solution pH, anions, cations, dissolved organic matter, and initial pollutant concentration. The degradation performance is slightly influenced by these parameters. Rhodamine B removal is 96.5% within 120 min, the rate constant ranges from 0.0086 min-1 to 0.0415 min-1 depending on temperature, and the activation energy is 79 kJ/mol. Effective degradation of different persistent organic pollutants including methylene blue, malachite green, sodium butyl xanthate, tetracycline, and p-nitrophenol is verified by UV-vis spectra. Natural chalcopyrite was characterized by advanced techniques including scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Reactions between chalcopyrite and H2O2 cause copper leaching and iron oxidation. Quenching experiments and electron paramagnetic resonance reveal the dominant role of hydroxyl radical in catalytic process. The catalytic mechanism induced by surface iron and leached copper derived from chalcopyrite is proposed.
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Affiliation(s)
- Jiapeng Yang
- School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Rong Huang
- School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Yijun Cao
- School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Hui Wang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
| | - Andrei Ivanets
- Institute of General and Inorganic Chemistry of National Academy of Sciences of Belarus, 220072, Minsk, Belarus
| | - Chongqing Wang
- School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, China.
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Du W, Huang R, Huang X, Chen R, Chen F. Copper-promoted heterogeneous Fenton-like oxidation of Rhodamine B over Fe 3O 4 magnetic nanocatalysts at mild conditions. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:19959-19968. [PMID: 33410002 DOI: 10.1007/s11356-020-12264-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 12/28/2020] [Indexed: 06/12/2023]
Abstract
Rhodamine B (RhB) is used in various industries and its effluent must be effectively treated because of its harmful and carcinogenic nature. In this work, ionothermally synthesized Cu-doped Fe3O4 magnetic nanoparticles (Cu-Fe3O4 MNPs) were found to be a highly efficient heterogeneous Fenton-like catalyst for complete decolorization of the RhB solution with H2O2 at pH ~ 7 and 25 °C. The effects of the catalyst loading, initial concentrations of RhB and H2O2, co-existing natural organic matter and inorganic salts, reaction temperature, and radical scavengers on the catalytic performance of Cu-Fe3O4 were investigated. Monte-Carlo simulations revealed that copper dopants facilitated the activation of H2O2 via adopting a terminal end-on adsorption mode and increased collision frequency by bringing the RhB molecules closer to H2O2 and the magnetite surface. These theoretical calculations provide new insight into the promotional effect of copper dopants in magnetite at molecular level.
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Affiliation(s)
- Wei Du
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan, 430073, People's Republic of China
| | - Ran Huang
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan, 430073, People's Republic of China
| | - Xuanlin Huang
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan, 430073, People's Republic of China
| | - Rong Chen
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan, 430073, People's Republic of China
- Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou, 450002, People's Republic of China
| | - Fengxi Chen
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan, 430073, People's Republic of China.
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