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Mu G, Yang Y, Chang Z, Yuan H, Huang Y, Batool I, Liu X, Ni C. Degradation of trichloroacetic acid by Fe/Ni bimetallic reactive PMS with hierarchical layered structure. ENVIRONMENTAL RESEARCH 2024; 248:118312. [PMID: 38295971 DOI: 10.1016/j.envres.2024.118312] [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: 12/07/2023] [Revised: 01/18/2024] [Accepted: 01/23/2024] [Indexed: 02/09/2024]
Abstract
Overuse of chlorinated disinfectants leads to a significant accumulation of disinfection by-products. Trichloroacetic acid (TCA) is a typical carcinogenic disinfection by-product. The efficacy of the conventional degradation process is reduced by the complex nature of its structure, causing a yearly increase in its prevalence within the ecological environment and consequent infliction of significant harm. In this paper, TCA was chosen as the research subject, Fe/Ni bimetallic nanoparticles were employed as the reducing catalyst, ZIF-8@HMON as the catalytic carrier combined with Fe/Ni nanoparticles, and peroxymonosulfate (PMS) was introduced to construct the reducing-advanced oxidation synergistic system and investigated the effect of this system on the degradation performance and degradation pathway of TCA. Various characterization techniques, including TEM, SEM, XRD, FT-IR, XPS, BET, were employed to investigate the morphology, element composition and structure of composite materials analysis. Moreover, the conditions for TCA degradation can be optimized by changing the experimental environment. The results showed that 25 mg of composite catalyst (mole ratio Fe: Ni = 1:1) and 10 mg of PMS effectively degraded TCA within 20-80 mg/L range at pH = 3 and 55 °C, achieving maximum degradation within 20 min. Finally, the potential pathways of TCA degradation were analyzed using EPR and LC-MS, and the corresponding reaction mechanisms were proposed.
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Affiliation(s)
- Guangda Mu
- School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai, 200237, China
| | - Yuxiang Yang
- School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai, 200237, China.
| | - Ziling Chang
- School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai, 200237, China
| | - Hongming Yuan
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun, 130012, China
| | - Yan Huang
- School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai, 200237, China
| | - Irum Batool
- School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai, 200237, China
| | - Xiangnong Liu
- Analysis Test Center, Yangzhou University, Yangzhou, 225009, China
| | - Chaoying Ni
- Department of Materials Science and Engineering, University of Delaware, DE, 19716, USA.
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Liu L, Yung KF, Yang H, Liu B. Emerging single-atom catalysts in the detection and purification of contaminated gases. Chem Sci 2024; 15:6285-6313. [PMID: 38699256 PMCID: PMC11062113 DOI: 10.1039/d4sc01030b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Accepted: 04/01/2024] [Indexed: 05/05/2024] Open
Abstract
Single atom catalysts (SACs) show exceptional molecular adsorption and electron transfer capabilities owing to their remarkable atomic efficiency and tunable electronic structure, thereby providing promising solutions for diverse important processes including photocatalysis, electrocatalysis, thermal catalysis, etc. Consequently, SACs hold great potential in the detection and degradation of pollutants present in contaminated gases. Over the past few years, SACs have made remarkable achievements in the field of contaminated gas detection and purification. In this review, we first provide a concise introduction to the significance and urgency of gas detection and pollutant purification, followed by a comprehensive overview of the structural feature identification methods for SACs. Subsequently, we systematically summarize the three key properties of SACs for detecting contaminated gases and discuss the research progress made in utilizing SACs to purify polluted gases. Finally, we analyze the enhancement mechanism and advantages of SACs in polluted gas detection and purification, and propose strategies to address challenges and expedite the development of SACs in polluted gas detection and purification.
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Affiliation(s)
- Lingyue Liu
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong China
| | - Ka-Fu Yung
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong China
| | - Hongbin Yang
- School of Materials Science and Engineering, Suzhou University of Science and Technology Suzhou 215009 China
| | - Bin Liu
- Department of Materials Science and Engineering, City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong SAR 999007 China
- Department of Chemistry, Hong Kong Institute of Clean Energy & Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong Hong Kong SAR 999077 China
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Liu Y, Qin L, Qin Y, Yang T, Lu H, Liu Y, Zhang Q, Liang W. Electrocatalytic degradation of nitrogenous heterocycles on confined particle electrodes derived from ZIF-67. JOURNAL OF HAZARDOUS MATERIALS 2024; 463:132899. [PMID: 37951167 DOI: 10.1016/j.jhazmat.2023.132899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 10/01/2023] [Accepted: 10/29/2023] [Indexed: 11/13/2023]
Abstract
Nitrogen-containing heterocyclic compounds (NHCs) are hazardous, toxic, and persistent pollutants, thereby requiring urgent solutions. Herein, ZIF-67 was compounded with powder-activated carbon (PAC) to prepare Co/NC/PAC (NC i.e. nitrogen-doped carbon) particle electrodes for the electrocatalytic treatment of pyridine and diazines. Co/NC/PAC reflected the confinement of Co3O4/CoN/Co0 into the N-doped graphitic-carbon layer to generate both pyrrolic-N and graphitic-N active sites. Under the optimal conditions (0.3 A, 12 mL min-1, and initial pH 7.00), the degradation of four NHCs realized 90.2-93.7% efficiencies. The number and position of N atoms in NHCs directly affected the degradation efficiency. The following increasing order of facilitated degradation was recorded: pyridazine < pyrimidine < pyrazine < pyridine. The as-obtained Co/NC/PAC possessed the direct redox effect on NHCs, achieving fast electrocatalytic rate. Species like ·OH and H* were detected in Co/NC/PAC system with contributions to NHCs degradation estimated to 24% and 34%, respectively. Density functional theory (DFT) calculations revealed H* susceptible to attacking the N position, while the meta-position of C was subject to hydroxyl radical (·OH) addition. Overall, degradation of NHCs was achieved by hydro-reduction, oxidation, ring opening cleavage, hydroxylation, and mineralization. Ring-cleavage and mineralization of NHCs provided a novel electrochemical strategy to refractory wastewater treatment.
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Affiliation(s)
- Yu Liu
- Beijing Key Lab for Source Control Technology of Water Pollution; Engineering Research Center for Water Pollution Source Control & Eco-remediation, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, China; College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
| | - Linlin Qin
- Beijing Key Lab for Source Control Technology of Water Pollution; Engineering Research Center for Water Pollution Source Control & Eco-remediation, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, China; College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
| | - Yiming Qin
- Beijing Key Lab for Source Control Technology of Water Pollution; Engineering Research Center for Water Pollution Source Control & Eco-remediation, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, China; College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
| | - Tong Yang
- Beijing Key Lab for Source Control Technology of Water Pollution; Engineering Research Center for Water Pollution Source Control & Eco-remediation, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, China; College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
| | - Haoran Lu
- Beijing Key Lab for Source Control Technology of Water Pollution; Engineering Research Center for Water Pollution Source Control & Eco-remediation, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, China; College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
| | - Yulong Liu
- Beijing Key Lab for Source Control Technology of Water Pollution; Engineering Research Center for Water Pollution Source Control & Eco-remediation, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, China; College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
| | - Qiqi Zhang
- Beijing Key Lab for Source Control Technology of Water Pollution; Engineering Research Center for Water Pollution Source Control & Eco-remediation, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, China; College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
| | - Wenyan Liang
- Beijing Key Lab for Source Control Technology of Water Pollution; Engineering Research Center for Water Pollution Source Control & Eco-remediation, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, China; College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
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Peng Y, Bian Z, Wang F, Li S, Xu S, Wang H. Electrocatalytic degradation of p-nitrophenol on metal-free cathode: Superoxide radical (O 2•-) production via molecular oxygen activation. JOURNAL OF HAZARDOUS MATERIALS 2024; 462:132797. [PMID: 37865078 DOI: 10.1016/j.jhazmat.2023.132797] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 10/10/2023] [Accepted: 10/15/2023] [Indexed: 10/23/2023]
Abstract
Although metal-free electrodes in molecular oxygen-activated Fenton-like wastewater treatment technologies have been developed, the reactive oxygen species (ROS) generation mechanisms are still not sufficiently clear. As a typical example of refractory phenolic wastewater, p-nitrophenol (PNP) has been widely studied. This study demonstrated the critical role of superoxide radicals (O2•-) in PNP degradation by metal-free electrodes through electron spin resonance (ESR), ROS quenching, and density functional theory (DFT) tests. The most superior metal-free electrode exhibited a mass activity of approximately 133.5 h-1 gcatalyst-1. Experimental and theoretical studies revealed the mechanism of O2•- generation via oxygen activation, including one- and three-electron transfer pathways, and found that O2•- mainly attacked the nitro group of PNP to degrade and transform the pollutant. This study enhances the mechanistic understanding of metal-free materials in the electrochemical degradation of refractory pollutants.
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Affiliation(s)
- Yiyin Peng
- College of Water Sciences, Beijing Normal University, Beijing 100875, PR China
| | - Zhaoyong Bian
- College of Water Sciences, Beijing Normal University, Beijing 100875, PR China.
| | - Feng Wang
- College of Water Sciences, Beijing Normal University, Beijing 100875, PR China
| | - Shunlin Li
- Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, PR China
| | - Shiwei Xu
- Beijing Capital Eco-Environment Protection Group Co., Ltd., Beijing 100044, PR China
| | - Hui Wang
- Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, PR China.
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