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Uniform CeO 2 /TiO 2 composite nanoparticles with different Ce/Ti molar ratios have been successfully synthesized via the sol–gel method. The samples were characterized using differential thermal analysis (DTA), thermogravimetric analysis (TGA), X‐ray diffraction (XRD), and transmission electron microscopy (TEM). The surface state analysis by means of X‐ray photoelectron spectroscopy (XPS) shows that the Ti element mainly exists as a chemical state of Ti 4+ , while the Ce element exists as a mixture of Ce 3+ and Ce 4+ oxidation states. The photocatalytic degradation of methyl orange (MeO) in CeO 2 /TiO 2 suspension was investigated. The results indicate that the CeO 2 /TiO 2 nanocomposites show higher photocatalytic activity than pure TiO 2 . Photodegradation of MeO can be improved by increasing the Ce/Ti molar ratio in the initial 15 min.
Yang et al. (Thu,) studied this question.