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Mo + C Codoped TiO 2 Using Thermal Oxidation for Enhancing Photocatalytic Activity

2010; American Chemical Society; Volume: 2; Issue: 4 Linguagem: Inglês

10.1021/am100011c

1944-8252

Jun Zhang, Chunxu Pan, Pengfei Fang, Jianhong Wei, Rui Xiong,

Catalytic Processes in Materials Science

The photocatalytic activity of TiO2 is enhanced mainly through heightening absorption of UV−vis light and improving the separation efficiency of photoinduced electrons and holes. The recent new theoretical research revealed that the TiO2 codoped with Mo + C is considered to be an optimal doping system. On the basis of this theory, the Mo + C codoped TiO2 powders were first experimentally synthesized by thermal oxidizing a mixture of TiC and MoO3 powders in the air. The XRD patterns and the XPS survey spectrum showed that carbon (C) acted as a Ti−O−C band structure and molybdenum (Mo) existed as Mo6+ in anatase TiO2. The Mo+C codoped TiO2 had a 32 nm red shift of the spectrum onset compared with pure anatase TiO2, and its band gap was reduced from 3.20 to 2.97 eV. The photocurrent of the Mo + C codoped TiO2 was about 4 times as high as that of pure anatase TiO2, and its photocatalytic activity on decomposition of methylene blue was enhanced.