Activation of Peroxymonosulfate by Surface-Loaded Noble Metal Nanoparticles for Oxidative Degradation of Organic Compounds

Yong Yoon Ahn, Eun Tae Yun, Ji Won Seo, Changha Lee, Sang Hoon Kim, Jae Hong Kim, Jaesang Lee

Research output: Contribution to journalArticle

98 Citations (Scopus)

Abstract

This study demonstrates the capability of noble metal nanoparticles immobilized on Al2O3 or TiO2 support to effectively activate peroxymonosulfate (PMS) and degrade select organic compounds in water. The noble metals outperformed a benchmark PMS activator such as Co2+ (water-soluble) for PMS activation and organic compound degradation at acidic pH and showed the comparable activation capacity at neutral pH. The efficiency was found to depend on the type of noble metal (following the order of Pd > Pt ≈ Au ≫ Ag), the amount of noble metal deposited onto the support, solution pH, and the type of target organic substrate. In contrast to common PMS-activated oxidation processes that involve sulfate radical as a main oxidant, the organic compound degradation kinetics were not affected by sulfate radical scavengers and exhibited substrate dependency that resembled the PMS activated by carbon nanotubes. The results presented herein suggest that noble metals can mediate electron transfer from organic compounds to PMS to achieve persulfate-driven oxidation, rather than through reductive conversion of PMS to reactive sulfate radical.

Original languageEnglish
Pages (from-to)10187-10197
Number of pages11
JournalEnvironmental Science and Technology
Volume50
Issue number18
DOIs
Publication statusPublished - 2016 Sep 20

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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