The photocatalytic activity of the system critically depends on the catalyst’s architecture and composition. In a ceria–titania system a proper ratio and location of ceria on titania might be crucial to have an optimum level of physicochemical properties for efficient charge carrier generation and separation in the system to initiate redox reaction at its surface. Herein, a novel architecture of the ceria-doped TiO 2 system has been developed to study its photoactivity and the mechanism of charge transfer. The photocatalytic activity with optimum cerium content Ce/Ti = 0.2 wt % shows the highest degradation of methylene blue under combined (UV + Vis) irradiation compared to the pristine titania. The obtained result shows that catalyst composition is an important parameter in modeling and optimizing the system to have the desired impact on photoactivity. The proposed unique architecture and composition combination appears to be an ideal model for design of novel photoactive materials having activity in a wide range of irradiation wavelength. The study is supported with characterization tools such as X-ray diffraction (XRD), transmission electron microscope (TEM), energy-dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), UV–Vis absorption (UV–Vis, DRS), and fluorescence studies.
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Verma et al. (2015) studied this question.