Activation of persulfates by carbon nanotubes: Oxidation of organic compounds by nonradical mechanism

Hongshin Lee, Hye Jin Lee, Joonseon Jeong, Jaesang Lee, Noh Back Park, Changha Lee

Research output: Contribution to journalArticle

263 Citations (Scopus)

Abstract

Carbon nanotubes (CNTs) have been found to activate persulfates (i.e., peroxymonosulfate and peroxydisulfate) into reactive species that are capable of oxidizing organic compounds in water. In the presence of single- or multi-walled CNTs, persulfates effectively degraded phenolic compounds and certain pharmaceuticals. Phenyl derivatives substituted with electron-withdrawing groups, such as benzoic acid and nitrobenzene, were resistant to degradation by the CNT/persulfate system. Based on observations regarding persulfate decomposition and linear sweep voltammetry using a CNT electrode, it has been suggested that persulfates bind onto the surface of CNTs, forming reactive complexes that are immediately decomposed upon reaction with organic compounds. Electron paramagnetic resonance spectroscopy with spin-trapping indicates that these reactive species are distinct from sulfate radical anions or hydroxyl radicals. The CNT-activated persulfate system shows promise as a novel treatment technology for the selective oxidation of organic contaminants in water.

Original languageEnglish
Pages (from-to)28-33
Number of pages6
JournalChemical Engineering Journal
Volume266
DOIs
Publication statusPublished - 2015 Apr 5

Keywords

  • Carbon nanotube
  • Nonradical mechanism
  • Organic compounds
  • Oxidation
  • Persulfate

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)
  • Industrial and Manufacturing Engineering
  • Environmental Chemistry

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