Ultra-efficient peroxymonosulfate utilization and trichloroethylene degradation in heterogeneous catalytic system guided by sheet-like Cu 2 MnO 4 nanoparticles: The role of Cu(III)-O species and free radicals.

Autor: Feng M; State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China., Xu Z; State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China., Xie H; Hangzhou Yanqu Information Technology Co., Ltd., Hangzhou, 310003, China., Lin K; State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China., Zhang M; State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China; Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China. Electronic address: zhangmeng@ecust.edu.cn.
Jazyk: angličtina
Zdroj: Journal of environmental management [J Environ Manage] 2024 Aug; Vol. 366, pp. 121799. Date of Electronic Publication: 2024 Jul 10.
DOI: 10.1016/j.jenvman.2024.121799
Abstrakt: Synthesizing cubic spinel Cu 2 MnO 4 with nanosheet structure (SCMO) aimed to construct a "non-radical-mediated radical-oxidative reaction", for increasing PMS utilization efficiency, and solving the defects of SO 4 •- and •OH through indirect PMS activation by electron transfer process. Compared with box-like Cu 2 MnO 4 (11.1%, 0.0035 min -1 ) and ordinary Cu 2 MnO 4 nanoparticles (21.3%, 0.0070 min -1 ), SCMO/PMS showed excellent trichloroethylene removal (98.8%, 0.1577 min -1 ). The pivotal role of Cu(III) was determined based on EPR analysis, quenching experiments, chemical probe experiments, hydrogen temperature-programmed reduction and Raman spectroscopy analysis, in-situ FTIR and Raman analyses. In brief, the interaction between PMS and SCMO could produce surface-bonded reactive complexes and the subsequent breaking of O-O bond in the sub-stable structure allowed the conversion of Cu(II) to Cu(III), which in turn facilitates the generation of •OH and SO 4 •- . The density functional theory (DFT) calculations provided supporting evidence for the electron donor role of SCMO and the increase of the electron acceptance capacity of PMS. SCMO/PMS system showed good resistance and degradation efficiency to complex composition and combined pollutants in actually contaminated groundwater, respectively. However, the coexistence of high concentrations of arsenic could significantly affect SCMO performance due to their adsorption on -OH groups, which still need in-depth study.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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