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He M, Zhao P, Duan R, Xu S, Cheng G, Li M, Ma S. Insights on the electron transfer pathway of phenolic pollutant degradation by endogenous N-doped carbonaceous materials and peroxymonosulfate system. JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127568. [PMID: 34736206 DOI: 10.1016/j.jhazmat.2021.127568] [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: 09/06/2021] [Revised: 10/10/2021] [Accepted: 10/18/2021] [Indexed: 06/13/2023]
Abstract
In this study, chitosan, a low-price and easily obtainable natural polymerized sugar containing abundant nitrogen element, was employed as a precursor for preparing hierarchically porous carbon (PC) to activate peroxymonosulfate (PMS). The PC fabricated at 800 °C obtained the optimum catalytic performance with complete removal of p-hydroxybenzoic acid (HBA) in 30 min. The selective degradation toward phenolic pollutants with different substituent groups and the resistance over the interference of typical anions and natural organic matter implied a non-radical pathway contributed most for HBA degradation. The investigation of structure-activity relationship suggested a positive linear correlation between graphitic N content and HBA removal. The chemical quenching experiment and electron paramagnetic resonance (EPR) excluded the crucial role of radicals and 1O2. Solid evidence based on electrochemical techniques demonstrated the essential contribution of electron transfer pathway achieved by three successive processes including the first close adsorption of PMS by PC800 to form metastable intermediates, then an internal electron transfer from active graphitic N to PMS within metastable intermediates and finally external electron transfer from HBA to metastable intermediates. This study provided insightful mechanism understanding of a promising organics elimination strategy by PMS activation through N-doped carbonaceous materials utilizing chitosan as a simultaneous carbon and nitrogen precursor.
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Affiliation(s)
- Mengfei He
- College of Resources and Environmental Sciences, Henan Agricultural University, Zhengzhou 450002, China
| | - Peng Zhao
- College of Resources and Environmental Sciences, Henan Agricultural University, Zhengzhou 450002, China.
| | - Ran Duan
- College of Resources and Environmental Sciences, Henan Agricultural University, Zhengzhou 450002, China
| | - Shengjun Xu
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Haidian District, Beijing 100085, China
| | - Gong Cheng
- Environmental Engineering Center, Shenzhen Academy of Environmental Sciences, Shenzhen 518001, China
| | - Mengjia Li
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Shuanglong Ma
- College of Resources and Environmental Sciences, Henan Agricultural University, Zhengzhou 450002, China.
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Gao Y, Tang Y, Liu W, Liu L, Zeng X, Yan S. Sulfur-doped carbon nanotubes with hierarchical micro/mesopores for high performance pseudocapacitive supercapacitors. NANOTECHNOLOGY 2021; 32:505401. [PMID: 34404036 DOI: 10.1088/1361-6528/ac1e52] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Accepted: 08/16/2021] [Indexed: 06/13/2023]
Abstract
Increasing the specific surface area and the amount of doping heteroatoms is an effective means to improve the electrochemical properties of carbon nanotubes (CNTs). The usual activation method makes it difficult for the retention of the heteroatoms while enlarging the specific surface area, and it can be found from literatures that specific surface area and S-content of carbon-based electrode materials are mutually exclusive. Here, CNTs with high specific surface area and sulfur content are constructed by simple activation of sulfonated polymer nanotubes with KHCO3, and the excellent electrochemical performance can be explained by the following points: first, KHCO3can be decomposed into K2CO3, CO2and H2O during the activation process. The synergistic action of physical activation (CO2and H2O) and chemical activation (K2CO3) equips the electrode material with high specific surface area of 1840 m2g-1and hierarchical micro/mesopores, which is beneficial to its double-layer capacitance. Second, compared with reported porous CNTs prepared by chemical activation (KOH) or physical activation (CO2or H2O), the mild activator KHCO3makes the sulfur content at a high level of 4.6 at%, which is very advantageous for high pseudocapacitance performance.
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Affiliation(s)
- Yang Gao
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi, 830046, Xinjiang, People's Republic of China
| | - Yakun Tang
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi, 830046, Xinjiang, People's Republic of China
| | - Wei Liu
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi, 830046, Xinjiang, People's Republic of China
| | - Lang Liu
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi, 830046, Xinjiang, People's Republic of China
| | - Xingyan Zeng
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi, 830046, Xinjiang, People's Republic of China
| | - Siqi Yan
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi, 830046, Xinjiang, People's Republic of China
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Liu RS, Shi XD, Wang CT, Gao YZ, Xu S, Hao GP, Chen S, Lu AH. Advances in Post-Combustion CO 2 Capture by Physical Adsorption: From Materials Innovation to Separation Practice. CHEMSUSCHEM 2021; 14:1428-1471. [PMID: 33403787 DOI: 10.1002/cssc.202002677] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 12/19/2020] [Indexed: 06/12/2023]
Abstract
The atmospheric CO2 concentration continues a rapid increase to its current record high value of 416 ppm for the time being. It calls for advanced CO2 capture technologies. One of the attractive technologies is physical adsorption-based separation, which shows easy regeneration and high cycle stability, and thus reduced energy penalties and cost. The extensive research on this topic is evidenced by the growing body of scientific and technical literature. The progress spans from the innovation of novel porous adsorbents to practical separation practices. Major CO2 capture materials include the most widely used industrially relevant porous carbons, zeolites, activated alumina, mesoporous silica, and the newly emerging metal-organic frameworks (MOFs) and covalent-organic framework (COFs). The key intrinsic properties such as pore structure, surface chemistry, preferable adsorption sites, and other structural features that would affect CO2 capture capacity, selectivity, and recyclability are first discussed. The industrial relevant variables such as particle size of adsorbents, the mechanical strength, adsorption heat management, and other technological advances are equally important, even more crucial when scaling up from bench and pilot-scale to demonstration and commercial scale. Therefore, we aim to bring a full picture of the adsorption-based CO2 separation technologies, from adsorbent design, intrinsic property evaluation to performance assessment not only under ideal equilibrium conditions but also in realistic pressure swing adsorption processes.
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Affiliation(s)
- Ru-Shuai Liu
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory for Catalytic Conversion Carbon Resources, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, P. R. China
| | - Xiao-Dong Shi
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory for Catalytic Conversion Carbon Resources, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, P. R. China
| | - Cheng-Tong Wang
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory for Catalytic Conversion Carbon Resources, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, P. R. China
| | - Yu-Zhou Gao
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory for Catalytic Conversion Carbon Resources, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, P. R. China
| | - Shuang Xu
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory for Catalytic Conversion Carbon Resources, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, P. R. China
| | - Guang-Ping Hao
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory for Catalytic Conversion Carbon Resources, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, P. R. China
| | - Shaoyun Chen
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory for Catalytic Conversion Carbon Resources, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, P. R. China
| | - An-Hui Lu
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory for Catalytic Conversion Carbon Resources, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, P. R. China
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