TiO₂ has been widely used as photocatalysts. It has shown good performance, especially, in environmental applications for contaminant detoxification. However, TiO₂ has an intrinsic limit for solar applications because it can be excited by only UV light not by visible light. In this study, an application of TiO₂ photocatalyst sensitized with tris(4,4''-dicarboxy-2,2-bipyridyl) ruthenium complex to CCl₄ degradating using visible light was investigated. By injecting electrons from the photoexcited sensitizer to the conduction band of TiO₂, the photoreductive decomposition of CCl₄ was achieved under the photoirradiation of λ>420 nm. The effects of pH, dissolved gases and sensitizer concentration on the photodegradative dfficiency were examined.