Visible Light Active Platinum-Ion-Doped TiO2 Photocatalyst

Platinum-ion-doped TiO2 was synthesized by a sol−gel method, and its visible light photocatalytic activities were successfully demonstrated for the oxidative and reductive degradation of chlorinated organic compounds

Soonhyun Kim; Seong-Ju Hwang; Wonyong Choi

2005

Scholarcy highlights

  • Platinum-ion-doped TiO2 was synthesized by a sol−gel method, and its visible light photocatalytic activities were successfully demonstrated for the oxidative and reductive degradation of chlorinated organic compounds
  • The flat band potential of Ption−TiO2 was positively shifted by 50 mV compared with that of undoped TiO2
  • X-ray absorption spectroscopy and X-ray photoelectron spectroscopy analyses showed that the Pt ions substituted in the TiO2 lattice were present mainly in the Pt(IV) state with some Pt(II) on the sample surface
  • The visible light activity of Ption−TiO2 was strongly affected by the calcination temperature and the concentration of Pt ion dopant, which were optimal at 673 K and 0.5 atom %, respectively
  • Visible-light-illuminated Ption−TiO2 could not degrade substrates such as tetramethylammonium and trichloroethylene, which are degraded with UV-illuminated TiO2
  • The characteristics and reactivities of Ption−TiO2 as a new visible light photocatalyst were investigated in various ways and discussed in detail

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