Sol–Gel Synthesis and Photocatalytic Activity of CeO2/TiO2 Nanocomposites |
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| Authors: | Huaming Yang Ke Zhang Rongrong Shi Aidong Tang |
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| Affiliation: | Department of Inorganic Materials, School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China; School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China |
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| Abstract: | Uniform CeO2 / TiO2 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 Ti4+, while the Ce element exists as a mixture of Ce3+ and Ce4+ oxidation states. The photocatalytic degradation of methyl orange (MeO) in CeO2 / TiO2 suspension was investigated. The results indicate that the CeO2/TiO2 nanocomposites show higher photocatalytic activity than pure TiO2. Photodegradation of MeO can be improved by increasing the Ce/Ti molar ratio in the initial 15 min. |
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