Abstract: The characteristics of the different types of (non－metal, rare earth metal and transition metal) elements of the doped TiO2 photocatalytic activity under visible light have been studied. XRD has been used to characterize the structure of samples. The crystal violet solution has been photodegraded to evaluate the photocatalytic performance of different doped TiO2 powders under visible light, through the UV visible spectrophotometer testing.

Key words: titanium dioxide, doping, visible light, photocatalytic performance