Abstract
Ceria (CeO2) nano particles were synthesized by new technique named a two-stage precipitation The cerium(III) nitrate hexahydrate, hydrogen peroxide and ammonia were used as the raw materials. The Ce 3+ ions were oxidized to Ce 4+ ions by hydrogen peroxide, the Ce 4+ were then precipitated by ammonium hydroxide to form the precursor in the chemical reaction process. The CeO 2 nano particles were obtained by the heat treatment of the precursor for 2 hrs. at 400∼800°C after drying treatment. The phase composition and the crystal structure of the CeO2 nano particles were studied by XRD (X-ray diffraction) patterns measured at room temperature. The crystal structure of CeO 2 is cubic system. It's space group is O 5 h Fm3m. The morphogenesis of CeO2 particles is ball-like particle observed by scanning electron microscopy (SEM). The average grain size of CeO2 nano crystal was identified by transmission electron microscopy (TEM) to be about 10 nm by heating treatment for 2 hrs at 400°C. The result of ultraviolet radiation-visible light photometer measurement shows that the ultraviolet absorption capability of CeO 2 particles depends on the grain size. The CeO 2 nanoparticle prepared by the process has better ultraviolet absorption property than that of commercial ceria microparticles. The CeO 2 nano particles exhibited photocatalytic activity for the decomposition of methyl orange under UV light irradiation.
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