Abstract
In order to utilize visible-light in photocatalytic conversion of NOx, nitrogen atoms were doped in commercially available photocatalytic TiO2 powders by impregnating method. The crystal structures of TiO2 were not changed after calcination process. Analysis by X-ray photoelectron spectroscopy (XPS) indicated that N atoms were incorporated in the bulk phase of TiO2 as N-Ti-O linkages. A significant shift of the absorption edge to a lower energy and a higher absorption in the visible-light region were observed. These N-doped TiO2 powders exhibited photocatalytic activity of the oxidation of NOx under visible-light irradiation. The sample mixed with 20 wt% ammonium carbonate and calcined in 600 °C showed best photocatalytic activity and its activity can be restored by rinsing with water after long-term operation.
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