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《Acta Physico-chimica Sinica》 2005-10
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Titanium Dioxide Nanoparticles Codoped with Pt and N for Photodegradation of Cl_3CCOOH

HUA, Nan-Ping1 WU, Zun-Yi1 DU, Yu-Kou1 ZOU, Zhi-Gang2 YANG, Ping1 (1Department of Chemistry, Suzhou University, Suzhou 215006; 2Ecomaterials an d Renewable Energy Research Center, Nanjing University, Nanjing 210093)  
Nanoparticles of titanium dioxide doped with nitrogen(N-TiO2) were syn thesized using sol-gel method. Nano-TiO2 codoped with platinum and nitrogen(Pt/N-TiO2) was prepared by photolys is-deposition of H2PtCl6 on N-TiO2 (0.5% (w) Pt). The onset of the absorption sp ectrum of Pt/N-TiO2 has a 20 nm red-shift and a weak absorption in the wavelengt h 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 ca talyst is 8% under visible light irradiation for 2 h. Doping nitrogen in TiO2 r educes 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 reco mbination of the photo-exited charge carriers and improve interfacial charge tra nsfer. Pt/N-TiO2 catalyst benefited from both of the effects.
【Key Words】: Nano-TiO_2 Pt and N codoping Trichloroacetic acid Visible light Photodegradation
【Fund】: 江苏省自然科学基金(BK2003031);; 江苏省教育厅(03KJB150115)资助项目~~
【CateGory Index】: O643.32
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