Improved visible-light responsive photocatalytic activity of N and Si co-doped titanias
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Thermal reaction of titanium tetraisopropoxide and tetraethyl orthosilicate in 1,4-butanediol afforded nanocrystalline silica-modified titanias having large surface area and superior thermal stability. In this study, the thus-obtained silica-modified titanias were treated in an NH3 flow at high temperatures, and their physical and photocatalytic properties were investigated. Compared with NH3-treated TiO2 without silica modification, the NH3-treated silica-modified titanias showed a stronger absorption in the visible region (400–500 nm) and had a larger peak at 396 eV in the N 1s XPS spectrum. These results indicate that a larger amount of nitrogen was stably doped in the silica-modified titania. The obtained products exhibited a high photocatalytic activity for degradation of Rhodamine B and decomposition of acetaldehyde under visible light irradiation.
KeywordsPhotocatalytic Activity Visible Light Irradiation High Photocatalytic Activity Visible Light Region Photocatalytic Decomposition
This study was supported by a Grant-in-Aid for Scientific Research (No. 16510085) from Ministry of Education, Culture, Sports, Science and Technology, Japan, and by the Kansai Research Foundation for Technology Promotion. One of the authors, S. I., thanks Prof. B. Ohtani for valuable discussions.
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