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Cerium oxide and CeO2-TiO2 mixed oxide particles were prepared using sol-gel method. Addition of TiO2 changed the apparent bandgap energy to shift the UV-absorption edge to higher wavelengths, and the maximum UV-A absorption was attained in the 50CeO2-50TiO2 (in mol%) sample. The results on XRD and TEM showed that crystallinity of the particles became lower with increasing in the TiO2 content, and both thermal- and photo-catalyses were deactivated by the formation of CeO2-TiO2 mixed oxides.
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Masui et al. (2002) studied this question.
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