Preparation of a Visible Light-responding Photocatalyst via Nitrogen Doping to Titanium(IV) Oxide Modified with a Silane Coupling Reagent

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A titanium(IV) oxide (TiO₂) sample having a large surface area and showing a large visible light absorption was prepared by modification of commercial TiO₂ with a silane coupling reagent and subsequent nitrogen doping with ammonia at 500°C. The thus-prepared visible light-responding TiO₂ sample was used photoinduced removal of gaseous nitrogen oxides (NO_x) under irradiation from blue light-emitting diodes or white fluorescent lamp and exhibited higher level of NO_x removal than nitrogen-doped unmodified TiO₂. A remarkable improvement in NO_x removal was achieved by removing silica species with sodium hydroxide solution presumably due to the large surface area for effective adsorption of NO_x and storage of nitric acid, and sufficient efficiency for both visible light and UV light.