Role of inorganic anions in improving the oxidizing capacity of heat-activated peroxymonosulfate: Identification of primary degradative pathways

Yae Eun Kim, Yong Yoon Ahn, Minjeong Kim, Jaemin Choi, Dahye Min, Jaesung Kim, Gun Hee Moon, Jaesang Lee

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number147472
JournalChemical Engineering Journal
Volume478
DOIs
Publication statusPublished - 2023 Dec 15

Bibliographical note

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

  • Anionic nucleophiles
  • Heat activation
  • Peroxymonosulfate
  • PMS-anion complexation
  • Sulfate radical

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

Fingerprint

Dive into the research topics of 'Role of inorganic anions in improving the oxidizing capacity of heat-activated peroxymonosulfate: Identification of primary degradative pathways'. Together they form a unique fingerprint.

Cite this