Influence of NH3-treating temperature on visible light photocatalytic activity of N-doped P25-TiO2

Autor: Zhensheng Jin, Zhishen Wu, Zhijun Zhang, Weiping Chen, Yan Wang, Caixia Feng
Rok vydání: 2009
Předmět:
Zdroj: Science in China Series B: Chemistry. 52:1164-1170
ISSN: 1862-2771
1006-9291
Popis: The influence of NH3-treating temperature on the visible light photocatalytic activity of N-doped P25-TiO2 as well as the relationship between the surface composition structure of TiO2 and its visible light photocatalytic activity were investigated. The results showed that N-doped P25-TiO2 treated at 600°C had the highest activity. The structure of P25-TiO2 was converted from anatase to rutile at 700°C. Moreover, no N-doping was detected at the surface of P25-TiO2. There was no simply linear relationship between the visible light photocatalytic activity and the concentration of doped nitrogen, and visible light absorption. The visible light photocatalytic activity of N-doped P25-TiO2 was mainly influenced by the synergistic action of the following factors: (i) the formation of the single-electron-trapped oxygen vacancies (denoted as V o · ); (ii) the doped nitrogen on the surface of TiO2; (iii) the anatase TiO2 structure.
Databáze: OpenAIRE
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