Citation: Qiu Hai-Bin, Guo Pu-Can, Yuan Li, Sheng Guo-Ping. Different non-radical oxidation processes of persulfate and peroxymonosulfate activation by nitrogen-doped mesoporous carbon[J]. Chinese Chemical Letters, ;2020, 31(10): 2614-2618. doi: 10.1016/j.cclet.2020.08.014 shu

Different non-radical oxidation processes of persulfate and peroxymonosulfate activation by nitrogen-doped mesoporous carbon

CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China

ly2016@ustc.edu.cn

gpsheng@ustc.edu.cn

Received Date: 18 June 2020
Revised Date: 14 July 2020
Accepted Date: 11 August 2020
Available Online: 13 August 2020

Figures(3)

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.
- Nitrogen-doped mesoporous carbon,
- Persulfate,
- Peroxymonosulfate,
- Non-radical process,
- Electron transfer,
- Singlet oxygen formation
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