Titanium dioxide nanoparticles codoped with Pt and N for photodegradation of CI3CCOOH

Nanoparticles of titanium dioxide doped with nitrogen(N-TiOD were synthesized using sol-gel method. Nano-TiO2 codoped with platinum and nitrogen(Pt/N-TiO2) was prepared by photolysis-deposition of H2RCL on NTiO2 (0-5% (w) Pt). The onset of the absorption spectrum of Pt/N-TiO, has a 20 run 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.