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Insights into the pollutant electron property inducing the transformation of peroxymonosulfate activation mechanisms on manganese dioxide
journal contributionposted on 2022-11-24, 23:01 authored by R Huang, P Gao, J Zhu, Y Zhang, Y Chen, S Huang, G Wang, Z Yu, Shuaifei ZhaoShuaifei Zhao, S Zhou
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 (1O2) and/or radicals. Additionally, the PMS activation mechanism depends on whether H2O 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.
JournalApplied Catalysis B: Environmental
LocationAmsterdam, The Netherlands
Publication classificationC1 Refereed article in a scholarly journal
Advanced oxidation processBISPHENOL-ACARBONCATALYTIC OXYGEN EVOLUTIONChemistryChemistry, PhysicalEFFICIENT PEROXYDISULFATE ACTIVATIONElectron propertyEngineeringEngineering, ChemicalEngineering, EnvironmentalMediated electron transferNONRADICAL ACTIVATIONNonradical activation mechanismO BOND FORMATIONORGANIC POLLUTANTSPHENOL DEGRADATIONPhysical SciencesScience & TechnologySELECTIVE DEGRADATIONSinglet oxygenSINGLET OXYGENTechnologyEnvironmental Engineering not elsewhere classifiedChemical Engineering not elsewhere classifiedPhysical Chemistry not elsewhere classified