A simple route has been developed for the synthesis of europium, nitrogen-codoped titania photocatalysts under mild conditions (i.e., low temperature, <= 348 K, and ambient pressure), The as-prepared photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectrom spectroscopy (XPS), and diffuse reflectance spectra (DRS) analyses. The results showed that the codoped photocatalyst with a spheroidal shape exhibited a smaller size than the undoped titania. The transformation from anatase to rutile was suppressed by doping with Eu and N atoms. Furthermore, the absorbance spectra of Eu, N-codoped TiO2 exhibited a significant red shift to the visible region. The photocatalytic activity of Eu, N-codoped TiO2 was evaluated by photodegradation of the dye reactive brilliant red X-3B under visible light. This codoped sample exhibited enhanced photocatalytic activity compared to N-doped TiO2, pure TiO2, and P25. (C) 2008 Elsevier Inc. All rights reserved.