Gold and Copper Nanoparticles Supported on Cerium(IV) Oxide—A Photocatalyst Mineralizing Organic Acids under Red Light Irradiation

Authors

  • Atsuhiro Tanaka,

    1. Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University, Kowakae, Higashiosaka, Osaka 577-8502 (Japan), Fax: (+81) 6-6727-2024
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  • Dr. Keiji Hashimoto,

    1. Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University, Kowakae, Higashiosaka, Osaka 577-8502 (Japan), Fax: (+81) 6-6727-2024
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  • Dr. Hiroshi Kominami

    Corresponding author
    1. Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University, Kowakae, Higashiosaka, Osaka 577-8502 (Japan), Fax: (+81) 6-6727-2024
    • Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University, Kowakae, Higashiosaka, Osaka 577-8502 (Japan), Fax: (+81) 6-6727-2024
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Abstract

Gold and copper nanoparticles supported on cerium(IV) oxide (CeO2) powder, which were prepared using a simple multistep photodeposition method, showed strong absorptions at around λ=620 nm attributed to the surface plasmon resonance of Cu-Au nanoparticles and exhibited a higher level of activity than that of Au/CeO2 in the mineralization of organic acids (formic acid and acetic acid) in aqueous suspensions under light irradiation (λ=640 nm) from a red light-emitting diode. The action spectrum in the mineralization of formic acid indicates that this mineralization involved a photoinduced step by the SPR of Cu-Au supported on CeO2. The apparent quantum efficiency reached 7.5 % at λ=625 nm and 5.2 % even at λ=700 nm.

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