| Cerium dioxide,a kind of rare earth dioxides,is useful and cheap.How to combine its unique characteristics with nano advantages for worthy application is the purpose of our study.We choose both microwave-assisted hydrothermal method and traditional hydrothermal method to synthesize CeO2 nanomaterials.The effect factors and formation mechanism were discussed.At the same time, the catalytic activity of CeO2 nanomaterials in the degradation of active Brilliant-blue dye solution was also investigated.The main study of this thesis is followed.1.Homogeneous and well-ordered CeO2 nanoparticles of cubic fluorite-type were synthesized by such conditions:Cerium(Ⅲ)nitrate (Ce(NO3)3·6H2O)and natrium acetate(NaAc)as reactants, hexadecyltrimethyl ammonium bromide(CTAB)as surfactant,the molar ratio of Ce(NO3)3·6H2O to NaAc to CTAB was 1:4:2,the volume of the mixture was 20ml,the reaction temperature was 180℃and the reaction time was 6h.The appearance of CeO2 nanoparticles which were synthesized by microwave-assisted hydrothermal method was better than the ones synthesized by traditional hydrothermal method.2.Homogeneous and well-ordered CeO2 nanorods with about 15nm diameters and 2μm length were synthesized by traditional hydrothermal method and such conditions:Cerium(Ⅲ)acetate(Ce(Ac)3·5H2O)and water(H2O)as reactants,hexadecyltrimethyl ammonium bromide(CTAB) as surfactant,the molar ratio of Ce(Ac)3·5H2O to H2O to CTAB was 1:4:2, the volume of the mixture was 20ml,the reaction temperature was 180℃and the reaction time was 6h.3.The active Brillant-blue(KN-R)solution can be degraded by CeO2 and CeO2 nanoparticles had higher catalytic activity than simple CeO2. The degradation rate of dye solution with different CeO2 nanoparticles showed that the CeO2 nanoparticles which were synthesized by 3.5h at 180℃had the highest catalytic activity.After 24hrs irradiation at 30℃, the highest catalytic degradation rate of the active Brilliant-blue(KN-R) was 93%.
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