Degradation of Direct Black 38 dye under visible light and sunlight irradiation by N-doped anatase TIO_2 as photocatalyst

摘要

The N-doped TiO_2 photocatalyst was prepared by calcination of a hydrolysis product composed of titanium (Ⅳ) isopropoxide with ammonia as the precipitator. X-ray diffraction, surface area, XPS and UV-vis spectra analyses showed a nanosized anatase structure and the appearance of a new absorption band in the visible region caused by nitrogen doping. The degradation of Direct Black 38 dye on the nitrogen-doped TiO_2 photocatalyst was investigated under visible light and sunlight irradiation. The N-doped anatase TiO_2 demonstrated excellent photocatalytic activity under visible light. Under sunlight irradiation, the N-doped sample showed slightly higher activity than that of the non-doped sample.