title: Activation of Peroxymonosulfate by Surface-Loaded Noble Metal Nanoparticles for Oxidative Degradation of Organic Compounds.
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 Co(2+) (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.
authors: Civil, Environmental, and Architectural Engineering, Korea University , Seoul 136-701, Korea.
authors: Yong-Yoon
authors: YY
authors: Ahn
authors: Civil, Environmental, and Architectural Engineering, Korea University , Seoul 136-701, Korea.
authors: Eun-Tae
authors: ET
authors: Yun
authors: Urban and Environmental Engineering, KIST-UNIST-Ulsan Center for Convergent Materials (KUUC), Ulsan National Institute of Science and Technology , Ulsan 698-805, Korea.
authors: Ji-Won
authors: JW
authors: Seo
authors: Urban and Environmental Engineering, KIST-UNIST-Ulsan Center for Convergent Materials (KUUC), Ulsan National Institute of Science and Technology , Ulsan 698-805, Korea.
authors: Changha
authors: C
authors: Lee
authors: Center for Materials Architecturing, Korea Institute of Science and Technology (KIST) , Seoul 136-701, Korea.
authors: Sang Hoon
authors: SH
authors: Kim
authors: Chemical and Environmental Engineering, Yale University , New Haven, Connecticut 06511, United States.
authors: Jae-Hong
authors: JH
authors: Kim
authors: Civil, Environmental, and Architectural Engineering, Korea University , Seoul 136-701, Korea.|Energy Environmental Policy and Technology, Green School, Korea University-KIST , Seoul 136-701, Korea.
authors: Jaesang
authors: J
authors: Lee
mesh_terms: D053768:Metal Nanoparticles; D037742:Nanotubes, Carbon; D009930:Organic Chemicals; D010084:Oxidation-Reduction; D010545:Peroxides / Q000737:chemistry*
chemical_list: D037742:Nanotubes, Carbon; D009930:Organic Chemicals; D010545:Peroxides; C038288:peroxymonosulfate