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SrTiO₃ and Ce 4+ doped SrTiO₃ were synthesized by a modified sol⁻gel process. The optimization synthesis parameters were obtained by a series of single factor experiments. Interesting phenomena are observable in Ce 4+ doped SrTiO₃ systems. Sr 2+ in SrTiO₃ system was replaced by Ce 4+ , which reduced the surface segregation of Ti 4+ , ameliorated agglomeration, increased specific surface area more than four times compared with pure SrTiO₃, and enhanced quantum efficiency for SrTiO₃. Results showed that Ce 4+ doping increased the physical adsorption of H₂O and adsorbed oxygen on the surface of SrTiO₃, which produced additional catalytic active centers. Electrons on the 4f energy level for Ce 4+ produced new energy states in the band gap of SrTiO₃, which not only realized the use of visible light but also led to an easier separation between the photogenerated electrons and holes. Ce 4+ repeatedly captured photoelectrons to produce Ce 3+ , which inhibited the recombination between photogenerated electrons and holes as well as prolonged their lifetime; it also enhanced quantum efficiency for SrTiO₃. The methylene blue (MB) degradation efficiency reached 98.7% using 3 mol % Ce 4+ doped SrTiO₃ as a photocatalyst, indicating highly photocatalytic activity.

New Insights into Sensitization Mechanism of the Doped Ce (IV) into Strontium Titanate