Abstract
Lanthanum and nitrogen co-doped SrTiO 3 was prepared by a mechanochemical reaction method using SrTiO 3, urea and La 2O 3 as the raw materials. Nitrogen-doped SrTiO 3 could be prepared by heating the mixture of SrTiO 3 and La 2O 3 under flowing NH 3 gas at 600 °C. The sample prepared with 0.2 mol% La 2O 3, 22 mol% urea and 77.8 mol% SrTiO 3 which has nearly the same nitrogen and lanthanum doping atomic fractions could be obtained by a mechanochemical method and exhibited high photocatalytic activities. Under the irradiation of light with wavelengths larger than 400 and 290 nm, the photocatalytic activity of nitrogen and lanthanum co-doped SrTiO 3 was 2.6 and two times greater than that of pure SrTiO 3. A new absorption edge, which was formed in the visible light region and higher visible light absorption after co-doping were the reason for the high visible light photocatalytic activity of this substance.
Published Version
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