Kim, Yae-Eun Ahn, Yong-Yoon Kim, Minjeong Choi, Jaemin Min, Dahye Kim, Jaesung Moon, Gun-Hee Lee, Jaesang 2024-01-12T06:31:33Z 2024-01-12T06:31:33Z 2023-11-22 2023-12 1385-8947 https://pubs.kist.re.kr/handle/201004/79706 This study demonstrated a drastic improvement in the oxidizing capacity of heat-activated peroxymonosulfate (heat/PMS) upon the addition of bicarbonate (HCO3) and phosphate (PO4). Injecting the anions caused a 20- to 30-fold increase in the phenol degradation efficiency of heat/PMS at the temperature range of 40？50 ℃ that was insufficient to thermally activate peroxydisulfate (PDS). The heat/PMS-PO4 outperformed heat/PDS in degrading benzoic acid, whereas heat/PMS-HCO3 marginally decomposed it. The reactivity of heat/PMS-PO4 did not vary sensitively depending on substrate type, which resulted from the increased yield of sulfate radical due to facile thermal cleavage of the peroxide bond loosened in the PMS-PO4 complex, based on the electron paramagnetic spectral features and quenching effects of radical scavengers. Degradation of phenols and furfuryl alcohol by heat/PMS-anion was highly accelerated under alkaline conditions through heat-promoted direct PMS oxidation and singlet oxygenation. Along with the similarity between the heat/PMS-anion systems in intermediate distribution (distinguished from that of heat/PDS) and chronoamperometric current response of the heated PMS solution upon the subsequent injection of anion and phenol, the extent of PMS consumption in the heated PMS-anion or PMS-organic-anion mixtures, which depended on substrate type and temperature, implied the role of heat-activated PMS-anion complexes as the non-radical oxidants. English Elsevier BV Role of inorganic anions in improving the oxidizing capacity of heat-activated peroxymonosulfate: Identification of primary degradative pathways Article 10.1016/j.cej.2023.147472 1 Chemical Engineering Journal, v.478 Chemical Engineering Journal 478 N scie scopus 001122461100001 Engineering, Environmental Engineering, Chemical Engineering Article ORGANIC CONTAMINANTS RATE CONSTANTS HYDROXYL RADICALS OXIDATION KINETICS PERSULFATE MECHANISM WATER ACID PHOSPHATE Peroxymonosulfate Heat activation Anionic nucleophiles Sulfate radical PMS-anion complexation