Oxidative power of N/TiO₂ photocatalysis under visible illumination

N-doped TiO₂ photocatalyst was prepared by calcination of hydrated titanium dioxide in ambient atmosphere at 600℃ for 2 h, which was obtained by using saturated urea solutions as precipitant. The photocatalytic properties of the obtained yellow sampies were studied using reactive brilliant red X-3B, 2, 4-dichlorophenol and CH₃COO^- as model pollutants. XPS results indicated that nitrogen was doped into TiO₂ lattice in the form of Ti-N chemical bond. UV-Vis results showed that the sample could absorb the visible light wavelength above 400 nm. Photocatalytic results revealed that X-3B and 2, 4-dichlorophenol could be degraded by N/TiO₂ photocatalysis when using a fluorescent lamp of 420 nm in main wavelength as the light source, while CH₃COO^- could not be degraded, however, CH₃COO^- could be degraded by N/TiO₂ photocatalysis under UV irradiation. The wavelength of excitation illumination has great influence on the oxidative power of N/TiO₂ photocatalysis.