Oxygen Vacancies Redirect Phenol Oxidation toward Polymerization. (IMAGE)
Caption
Oxygen Vacancies Redirect Phenol Oxidation toward Polymerization. This schematic illustrates how oxygen vacancy engineering changes the reaction pathway of phenol (PhOH) removal in a peroxymonosulfate (PMS)-based catalytic system. In the pristine MnFe₂O₄/carbon cloth (MFOCC) system, phenol is mainly removed through a conventional mineralization pathway, generating sulfate radicals and converting part of the organic carbon into H₂O and CO₂, with a total organic carbon (TOC) removal ratio below 60%. After oxygen vacancies are introduced, the oxygen-vacancy-rich catalyst (MFOCC-VO) activates PMS through a surface-confined direct oxidative transfer process (DOTP). This promotes two-electron transfer, generates phenoxy radical intermediates, and drives phenol polymerization on the catalyst surface, increasing TOC removal to above 80% while suppressing radical-dominated oxidation.
Credit
Environmental Science and Ecotechnology
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