Controlled Preparation Of Ceria Micro/Nanostructured Materials And Their Properties

In recent years, the cerium oxide-based compounds as an important part of the rare earth functional materials with a wide range of performance applications. This is not only related to the physical and chemical properties of cerium oxide based nanomaterials, there is a close relationship with their microstructure, average particle size, dispersion. So if we want to improve the performance of the applications of cerium oxide based nanomaterials and industrial production, it is necessary to choose the appropriate method for preparing to synthesize a certain morphology, size of nanomaterials.The preparation technologies of ceria nanomaterials is varieties, but it is still diffcult to get the structure, size, morphology control of nanomaterials. Hydrothermal Synthesis of ceria is traditional, practical and effective method for synthesizing uniform morphology of the product obtained with high crystallinity, but also it can effectively control the morphology and particle size distribution by adding the feedstock.CeCl37H2O as cerium source, CTAB as a dispersing agent, NaOH solution as precipitant, water as solvent,180℃ hydrothermal 24h, the product particles were approximately 25 nm in diameter, about 6μm one-dimensional linear cerium oxide, and discussed the factors of affecting the formation of nanowires, the results show that:cerium chloride as cerium source, CTAB as dispersing agent, Ce3+:CTAB mole ratio of 1:1/2,12 mol/L NaOH as the precipitating agent, water as solvent,180℃ hydrothermal 24h, the uniform nanowires, good dispersion, nor the reunion.Experimental CeCl3.7H2O as materials, ammonia as the precipitating agent, PVP dispersant, ethylene glycol as the solvent,180℃ hydrothermal for 24h, were characterized by XRD, SEM, TEM and so on a series of measures on product characterization, and at the same time studied the calcined temperature and under different pH of the polishing efficiency. The results showed that the morphology of the product is self-assembled approaching spherical Ce(OH)3, for approximately 200nm in diameter, when the calcination temperature increased, the degree of crystallinity increased as it, but the polishing efficiency decreased. in calcination at 500℃ for 2h, have the best polishing efficiency, the MRR with increasing follow by the pH increases, pH=12 the MRR can reach 65nm/min; In the degradation of methyl orange experiments, it can be degradation after 60min, The complete decolorization rate of more than 90%.CeCl3.7H2O as cerium source, DDAB as dispersant, ammonia as the precipitating agent, ethylene glycol as the solvent,180℃ hydrothermal for 24 hours, the product particles were the assembly zaoren-shaped ceria crystal particles, approximately 200nm in diameter, about 500nm long, respectively. consider the different calcination temperature and different pH polishing efficiency, the results show that:when calcined at 500℃ for 2h, the polishing efficiency is the best, pH=12, the MRR 52nm/min; In the degradation of methyl orange experiment, decolorization rate of more than 98% after 50min.