Abstract：To research the photocatalytic activity of Cu-N co-doped TiO₂powders, Cu or N doped TiO_2, Cu-N co-doped TiO₂ and pure TiO2 photocatalysts were prepared by sol -gel method at different calcination temperatures. The different TiO₂ samples were characterized by X ray diffraction，nitrogen adsorption -desorption and X ray photoelectron spectra, and so on．The photocatalytic performance of the samples were studied using methyl orange as model of azo compounds in aqueous solutions. The results show that Cu-N co-doping can improve the thermal stability of TiO₂ and inhibite the phase transformation from anatase to rutile. The sample of Cu-N codoped TiO₂ calcined at 500 ℃ exhibites the highest photocatalytic activity under visible light irradiation and 93% methyl orange is degraded after 180 min．

Keywords: titania; doping; photocatalysis; azo compound

中图分类号：TQ426，TB383         文献标志码：A

文章编号：1008-5548(2015)01-0033-05

DOI:10.13732/j.issn.1008-5548.2015.01.007

收稿日期：2014-08-04， 修回日期：2014-08-20，在线出版时间：2015-03-02。

第一作者简介：钟春燕（1984—），女，硕士，讲师，研究方向为无机精细材料的制备与应用。 电话：0851-4704536，E-mail：65544826@qq.com。