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 journalArticlepeer-review

    278 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 Sept 20

    Bibliographical note

    Publisher Copyright:
    © 2016 American Chemical Society.

    ASJC Scopus subject areas

    • General Chemistry
    • Environmental Chemistry

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