Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (10): 1081-1085.doi: 10.3866/PKU.WHXB20051004

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Titanium Dioxide Nanoparticles Codoped with Pt and N for Photodegradation of Cl3CCOOH

HUA Nan-ping; WU Zun-yi; DU Yu-kou; ZOU Zhi-gang; YANG Ping   

  1. Department of Chemistry, Suzhou University, Suzhou 215006; Ecomaterials and Renewable Energy Research Center, Nanjing University, Nanjing 210093
  • Received:2005-01-28 Revised:2005-04-05 Published:2005-10-15
  • Contact: YANG Ping

Abstract: Nanoparticles of titanium dioxide doped with nitrogen (N-TiO2) were synthesized using sol-gel method. Nano-TiO2 codoped with platinum and nitrogen (Pt/N-TiO2) was prepared by photolysis-deposition of H2PtCl6 on N-TiO2 (0.5% (w) Pt). The onset of the absorption spectrum of Pt/N-TiO2 has a 20 nm red-shift and a weak absorption in the wavelength region from 400 to 500 nm compared with the spectrum of the non- doped catalyst. The photocurrent of Pt/N-TiO2 electrode is five times higher than that of TiO2 electrode. The photodegradation yield of trichloroacetic acid over Pt/N-TiO2 catalyst is 8% under visible light irradiation for 2 h. Doping nitrogen in TiO2 reduces the band gap of anatase, which makes N-TiO2 possess catalytic activity in visible light region. Pt clusters precipitated on nano-TiO2 may retard the recombination of the photo-exited charge carriers and improve interfacial charge transfer. Pt/N-TiO2 catalyst benefited from both of the effects.

Key words: Nano-TiO2, Pt and N codoping, Trichloroacetic acid, Visible light, Photodegradation