Palladium Oxide Nanoparticles on Nitrogen-Doped Titanium Oxide: Accelerated Photocatalytic Disinfection and Post-Illumination Catalytic “Memory”

Authors

  • Qi Li,

    1. Department of Materials Science and Engineering University of Illinois at Urbana–Champaign Urbana, IL 61801 (USA)
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  • Yin Wai Li,

    1. Department of Materials Science and Engineering University of Illinois at Urbana–Champaign Urbana, IL 61801 (USA)
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  • Pinggui Wu,

    1. Department of Materials Science and Engineering University of Illinois at Urbana–Champaign Urbana, IL 61801 (USA)
    2. Present address: Praxair, Inc., Tonawanda, NY 14150, USA.
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  • Rongcai Xie,

    1. Department of Materials Science and Engineering University of Illinois at Urbana–Champaign Urbana, IL 61801 (USA)
    2. Present address: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, PR China.
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  • Jian Ku Shang

    Corresponding author
    1. Department of Materials Science and Engineering University of Illinois at Urbana–Champaign Urbana, IL 61801 (USA)
    • Department of Materials Science and Engineering University of Illinois at Urbana–Champaign Urbana, IL 61801 (USA).
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  • The authors would like to thank Prof. J. Economy in the Department of Materials Science and Engineering, University of Illinois at Urbana– Champaign for providing the ACGF template, and Prof. Mark J. Nilges in the Illinois EPR Research Center, University of Illinois at Urbana–Champaign, for the assistance on EPR measurement. This work was supported by the Center of Advanced Materials for the Purification of Water with Systems, National Science Foundation, under Agreement Number CTS-0120978. SEM and optical measurements were carried out at the Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana–Champaign, which is partially supported by the U.S. Department of Energy under grant DEFG02-91-ER45439.

Abstract

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A visible light photocatalyst is synthesized by dispersing palladium oxide nanoparticles on nitrogen-doped n-titanium oxide. The photocatalyst demonstrates not only a much faster photocatalytic disinfection rate on Escherichia coli under visible light illumination than nitrogen-doped titanium oxide, but also a “memory” catalytic disinfection capability. These unusual antimicrobial properties of TiON/PdO are derived from strong optoelectronic coupling between PdO nanoparticles and TiON semiconductor.

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