Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 50, Issue 18, Pages 10187-10197Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.6b02841
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2014R1A1A2056935]
- future R&D Program by Korea Institute of Science and Technology [2E26120]
- Korea Ministry of Environment as The GALA Project [2016000550007]
- Ministry of Trade, Industry, and Energy (MOTIE), Korea [R0004881]
- Ministry of Science, ICT & Future Planning, Republic of Korea [2E26120] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2014R1A1A2056935] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 approximate to 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.
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