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Wang J, Yao J, Li Y, Wei Z, Gao C, Jiang L, Wu X. S vacancies-introduced chalcopyrite switch radical to non-radical pathways via peroxymonosulfate activation: Vital roles of S vacancies. JOURNAL OF HAZARDOUS MATERIALS 2024; 467:133751. [PMID: 38341884 DOI: 10.1016/j.jhazmat.2024.133751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2023] [Revised: 12/23/2023] [Accepted: 02/06/2024] [Indexed: 02/13/2024]
Abstract
Regulation of peroxymonosulfate (PMS) activation from radical to non-radical pathways is an emerging focus of advanced oxidation processes (AOPs) due to its superiority of anti-interference to complex wastewater. However, the detailed correlation mechanism between the defect structure of the catalyst and the regulation of radicals/non-radicals remains unclear. Herein, natural chalcopyrite (CuFeS2) with different levels of S vacancies created by a simple NaBH4 reduction process was employed to explore the above-mentioned underlying mechanism for constructing high efficiency and low cost of catalyst towards AOPs. With the assistance of simulated solar light, S-deficient chalcopyrite (Sv-NCP) exhibited prominent performance for PMS activation. More interestingly, the different degrees of S vacancies regulated the active species from radicals to non-radical 1O2, thus showing excellent purification of complex wastewater as well as actual pharmaceutical wastewater. Mechanistic analysis reveals that PMS tends to loss electrons on S vacancies sites and is dissociated into 1O2 rather than ·OH/SO4·- due to electron deficiency. Meanwhile, the improved adsorption performance makes the degradation sites of pollutants change from solution to surface. Most importantly, Sv-NCP presented excellent detoxication for antibiotic wastewater due to the high selectivity of 1O2. This work provides novel insights into the regulation of active species in Fenton-like reactions via defect engineering for high efficiency of pollutant degradation.
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Affiliation(s)
- Jinpeng Wang
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Jia Yao
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Yubiao Li
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China; Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Wuhan 430070, China.
| | - Zhenlun Wei
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Caiyan Gao
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Lisha Jiang
- School of Environmental and Material Engineering, Yantai University, Yantai 264005, China
| | - Xiaoyong Wu
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China; Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Wuhan 430070, China.
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Duan P, Kong F, Fu X, Han Z, Sun G, Yu Z, Wang S, Cui Y. Peroxymonosulfate activation by walnut shell activated carbon supported nano zero-valent iron for the degradation of tetracycline: Performance, degradation pathway and mechanism. ENVIRONMENTAL RESEARCH 2024; 245:117971. [PMID: 38145740 DOI: 10.1016/j.envres.2023.117971] [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: 09/07/2023] [Revised: 11/11/2023] [Accepted: 12/03/2023] [Indexed: 12/27/2023]
Abstract
In this study, activated carbon (WS-AC) was prepared from walnut shell. Nano-zero-valent iron (nZVI) was loaded on walnut shell activated carbon by liquid phase reduction method and used as catalyst (WS-AC/nZVI) to activate peroxymonosulfate (PMS) to efficiently degrade tetracycline (TC) in solution. The composite material with a mass ratio of WS-AC to nZVI of 1:1 has the highest catalytic performance for activating PMS to degrade TC. The results showed that under the conditions of TC concentration of 100 ppm, PMS dosage of 0.2 mM and WS-AC/nZVI dosage of 0.1 g/L, the removal efficiency of TC could reach 81%. Based on quenching experiments and electron spin resonance (EPR), it was verified that •OH, SO4•- and 1O2 bound on the catalyst surface were the main reactive oxygen species during the reaction. The intermediate products of TC were identified by liquid chromatography-mass spectrometry (HPLC-MS) and DFT calculation, and the possible degradation pathway of TC was proposed. The catalyst still maintained high removal efficiency of TC after four cycles of experiments, and the minimal iron loss on the surface of the catalyst indicated that it had good stability. The efficient and stable WS-AC/nZVI activated PMS showed great potential in the degradation of antibiotics.
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Affiliation(s)
- Pingping Duan
- College of Environmental Science and Engineering, Qingdao University, Qingdao, 266071, China
| | - Fanlong Kong
- College of Environmental Science and Engineering, Qingdao University, Qingdao, 266071, China; Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao, 266071, China
| | - Xiuzheng Fu
- College of Environmental Science and Engineering, Qingdao University, Qingdao, 266071, China
| | - Zhijie Han
- College of Environmental Science and Engineering, Qingdao University, Qingdao, 266071, China
| | - Guangwei Sun
- College of Environmental Science and Engineering, Qingdao University, Qingdao, 266071, China
| | - Zhengda Yu
- College of Environmental Science and Engineering, Qingdao University, Qingdao, 266071, China; Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao, 266071, China
| | - Sen Wang
- College of Environmental Science and Engineering, Qingdao University, Qingdao, 266071, China; Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao, 266071, China.
| | - Yuqian Cui
- College of Environmental Science and Engineering, Qingdao University, Qingdao, 266071, China; Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao, 266071, China.
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Gao X, Dai C, Tian X, Nie Y, Shi J. Self-acclimation mechanism of pyrite to sulfamethoxazole concentration in terms of degradation behavior and toxicity effects caused by reactive oxygen species. JOURNAL OF HAZARDOUS MATERIALS 2024; 464:132962. [PMID: 37976862 DOI: 10.1016/j.jhazmat.2023.132962] [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: 06/27/2023] [Revised: 10/26/2023] [Accepted: 11/07/2023] [Indexed: 11/19/2023]
Abstract
Pyrite has been extensively tested for oxidizing contaminants via the activation of water molecule or dissolved oxygen, while the changing of oxidation species induced by contaminant's concentration has been largely underestimated. In this study, we revealed a self-acclimation mechanism of pyrite in terms of •OH conversion to 1O2 during the sulfamethoxazole (SMX) degradation process under oxic conditions. Two reaction stages of SMX degradation by pyrite were observed. The SMX concentration decreased by 70% rapidly in the first 12 h after the reaction was initiated, then, the removal rate began to decrease as the SMX concentration decreased. Importantly, •OH and O2•- were the dominant oxidizing species in stage one, while 1O2 was responsible for the further degradation of SMX in stage two. The self-acclimated mechanism of pyrite was proven to be caused by the conversion of oxidative species at the surface of pyrite. This process can overcome the shortages of •OH such as ultrashort lifetime and limited effective diffusion in the decontamination of micropollutant. Moreover, different reactive oxygen species will lead to different degradation pathways and environmental toxicity while degrading pollutants. This finding of oxidizing species' self-acclimation mechanism should be of concern when using pyrite for water treatment.
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Affiliation(s)
- Xuyun Gao
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China
| | - Chu Dai
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China
| | - Xike Tian
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, PR China
| | - Yulun Nie
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, PR China.
| | - Jianbo Shi
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, PR China
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