Multi-level Structure Of Mesoporous Rare Earth Oxide Preparation And Application Of Research

Nanostructure mesoporous materials have attracted extensive attention owing to their great potential applications. To date, most researches in mesoporous materials are focused on the synthesis of novel mesoporous materials and their functionalizations for application. Furthermore owing to the unique property of the electron, light, magnetism and catalysis, the mesoporous Rare-earth oxide have earned intensive research and application. The synthesizing of mesoporous rare earth oxide nanomaterials with special morphology, size, dimension and pore structure and studying the internal relationship between its physical properties and structures for further assembling functional rare earth nanomaterials are of theoretical and realistical significantion.In this paper, the mesoporous CeO2 was prepared through various methods meanwhile the relationship between the morphology and the structure and property has deeply studied, which attributed to the development of the rare-earth oxide mesoporous with special morphology. The whole paper has six charpters and the first charpter is the backgound introduction, the second is about the experiment and characterization, and the last four were noted as follows:In charpter three, the Ce and Ag composite supported on the SBA-15 was synthesized and applied in the research of antibacterial through impregnation method. The experiment result shows the exsitence of the Ce has a positive effect on the even distribution of the Ag nano wires in the pore channel, at the mean time, the Ce can greatly enhance the activity of the Ag nano-wires. The synthesized material has an excellent impact on killing the Escherichia coli and Staphylococcus aureus.In charpter four, the mesoporous CeO2 was prepared through hydrothermal method with phenolic resin functionlized with–NH2 as the template for the first time. The structure and morphology were characterizated by XRD, BET, TEM and so on. After loading the amount of Ag, according to the test of anti-bacterium, the material has high activity to the Escherichia coli and Staphylococcus aureus.In charpter five, the CeO2 with the morphology of core-shell was created by the solvent-thermal method firstly. With the help of SEM, TEM, XRD and TG-DTA, the morphology of the CeO2 was fully analysed and characterized, as a result of which the formation mechanism was also covered. The prepared core-shell CeO2 has a large surface area and stable pore structure and above all has strong adsorption of the ultra-violate,which maybe become a high efficiency UV shielding .The synthesis method used in this paper is universally significant, it can be developed into a general method and applied to nanomaterial synthesis of other rare earth oxides.In charter six, the mesoporous CeO2 with core-shell and hollow sphere was prepared with hydro-thermal methods using glucose as the template. Through the adjustment of ratio between the water and the ethanol and the concentration of the glucose, the realization of the change from the hollow sphere to the core-shell is aviliable. With regard to the change condition, the formation mechanism of the core-shell and hollow sphere was proposed, moreover using such mechanism, a series of other core-shell rare earth oxides were fabricated, which pave a way to a simple, moderate synthesize of the morphology-controllable mesoporous rare-earth oxide.