微波法制备具有可见光活性的氮掺杂二氧化钛

Preparation of nitrogen-doped titanium dioxide with visible-light photocatalytic activity using a microwave method

采用乙二醇作为溶剂，脲为氮源，用微波法制备了氮掺杂的二氧化钛纳米催化剂。采用傅立叶变换红外（FTIR），波长色散谱（WDS），X射线衍射（XRD），X射线光电子能谱（XPS）等对样品的化学组成以及表面基团进行了表征和分析。在模拟太阳光和可见光的条件下对甲基橙进行光催化降解评价，结果表明该催化剂在没有降低二氧化钛紫外区活性的同时具有较高可见光催化活性。

Nitrogen-doped TiO2 nanoparticles have been successfully prepared using a microwave method with ethylene glycol as solvent and urea as the nitrogen source. As synthesized N-TiO2 was characterized by means of XRD, FTIR and XPS techniques. N-TiO2 has been applied in photocatalytic degradation of methyl orange as model of organic pollutant in water under the UV-Vis （simulated solar light） and the visible region （λ〉400nm）. The results show that the photocatalytic activity of N-TiO2 is higher than that of degussa P25 TiO2 photocatalys, and the optimum preparation temperature of N-TiO2 is 135℃. The results suggest that the novel N-TiO2 is a promising and efficient catalyst to degrade organic pollutants under visible light irradiation.