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Insights into the pollutant electron property inducing the transformation of peroxymonosulfate activation mechanisms on manganese dioxide.
- Source :
-
Applied Catalysis B: Environmental . Nov2022, Vol. 317, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- Herein, using manganese dioxide octahedral molecular sieve (Mn-OMS) as the catalyst, we investigate how pollutant electron property affects the peroxymonosulfate (PMS) activation mechanism. More than 95% of electron-rich pollutants are degraded in the Mn-OMS/PMS system after 30 min reaction time, but oxidative decomposition of electron-poor pollutants takes at least 150 min. This difference in reaction rate is proved to be pollutant-dependent. We then combine multiple methods to cross-validate the PMS activation mechanism, including the quenching test, EPR characterization, solvent-exchange experiment, PMS decomposition rate test, and electrochemical analysis. Catalyst-mediated electron transfer is determined as the main activation mechanism for electron-rich pollutants degradation, while removal of electron-poor pollutants relies on singlet oxygen (1O 2) and/or radicals. Additionally, the PMS activation mechanism depends on whether H 2 O or pollutants or low-valence Mn ions preferentially transfer electrons to the adsorbed PMS. This work provides mechanistic insights into the effect of pollutants type on PMS activation. [Display omitted] • Pollutant type can induce the transformation of PMS activation mechanism. • Water molecules are indispensable reactants in singlet oxygen generation. • The sources of singlet oxygen are water molecules and peroxides. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09263373
- Volume :
- 317
- Database :
- Academic Search Index
- Journal :
- Applied Catalysis B: Environmental
- Publication Type :
- Academic Journal
- Accession number :
- 158512892
- Full Text :
- https://doi.org/10.1016/j.apcatb.2022.121753