ABSTRACT: TiO2 and SnO2/TiO2 photocatalysts were prepared by a sol-gel method using different SnO2 content (0–20 wt.%). The samples were calcined at 500oC and characterized by UV–vis absorption spectroscopy. The photocatalytic activity was tested by the photodegradation of Brilliant green (BG) under the UV–vis irradiations. The results showed that the degradation of BG over SnO2/TiO2 nanocatalysts was much higher than that of TiO2 and 10% SnO2/TiO2 exhibited the higher photocatalytic activity. The effects of BG concentration, SnO2 content and catalyst weight on the photocatalytic activity of the SnO2/TiO2 nanocatalysts were studied.