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To photo-catalytically degrade RhB dye using solar irradiation, CeO₂ doped TiO₂ nanocomposites were synthesized hydrothermally at 700 °C for 9 hrs. All emission spectra showed a prominent band centered at 442 nm that was attributed to oxygen related defects in the CeO₂-TiO₂ nanocrystals. Two sharp absorption bands at 1418 cm⁻¹ and 3323 cm⁻¹ were attributed to the deformation and stretching vibration, and bending vibration of the OH group of water physisorbed to TiO₂, respectively. The photocatalytic activities of Ce-TiO₂ nanocrystals were investigated through the degradation of RhB under UV and UV+ visible light over a period of 8 hrs. After 8 hrs, the most intense absorption peak at 579 nm disappeared under the highest photocatalytic activity and 99.89% of RhB degraded under solar irradiation. Visible light-activated TiO₂ could be prepared from metal-ion incorporation, reduction of TiO₂ …