Journal
CHINESE CHEMICAL LETTERS
Volume 31, Issue 10, Pages 2614-2618Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2020.08.014
Keywords
Nitrogen-doped mesoporous carbon; Persulfate; Peroxymonosulfate; Non-radical process; Electron transfer; Singlet oxygen formation
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Funding
- National Key R&D Program of China [2019YFC0408502]
- National Natural Science Foundation of China (NSFC) [51825804, 51821006]
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Activated persulfate oxidation is an emerging advanced oxidation process for organic pollutant degradation. Own to different molecular structures and oxidation potentials, persulfate (PDS) and peroxymonosulfate (PMS) may show different degradation performances due to various catalytic mechanisms even by the same catalysts. In this study, the nitrogen-doped mesoporous carbon (N-OMC) was applied to activate PDS and PMS for degrading a model organic pollutant phenol to reveal their activation mechanisms. Results show that both PDS and PMS could be efficiently activated by N-OMC. The degradation of phenol fitted well with pseudo-first-order kinetics, whose kinetic constants increased with the increase of pH, PDS/PMS dosage, and N-OMC dosage. Based on quenching experiments and electron spin resonance spin-trapping technique, the N-OMC was found to activate PDS and PMS via non-radical process of electron transfer and singlet oxygen formation, respectively, instead of the commonly observed radical process. This work will be useful to understand the activation processes of PDS and PMS, and benefit for the development of catalysts for pollutant degradation. (C) 2020 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
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