Preparation method of cerium oxide nanoballs

Abstract

The invention relates to a preparation method of cerium oxide nanoballs, and belongs to the technical field of the preparation processes of the inorganic nanomaterials. The key points of the method of the invention include: stirring and mixing cerium salt and a certain amount of surfactant at room temperature, dissolving the mixture in a mixed solution of water and an organic solvent and ultrasonically processing the mixture for 5 to 10 minutes, wherein the cerium salt is optimally cerium nitrate; the surfactant is most preferably polyvinylpyrrolidone; and the belonged organic solvent is most preferably diglycol; then transferring the mixed solution into a high pressure reaction kettle to perform a solvothermal reaction; heating the mixed solution to perform reaction for 24 to 28 hours at the temperature of 100 to 200 DEG C so as to obtain the cerium oxide nanoball sol; evaporating the sol at the temperature of 1500 o 180 DEG C to dryness; and forging the obtained powder for 1 to 4 hours at the temperature of 400 to 600 DEG C; and finally obtaining the cerium oxide nanoballs in the shape of yellow solid powder. The nanoballs have a particle size ranging from 30 to 160nm and high performance and can be applied in fields of ultraviolet light shielding, mechanical polishing and automobile exhaust catalyzation and the like.

Description

technical field [0001] The invention relates to a method for preparing cerium oxide nanospheres, which belongs to the technical field of inorganic nanomaterial preparation technology. Background technique [0002] Rare earth materials are widely used in high-energy magnetic devices, light-emitting devices, catalysts and other functional materials due to their unique electrical, optical, thermal, magnetic and other properties, so they are also known as the "treasure house" of new materials. my country's rare earth resources are very rich, accounting for more than 80% of the world's proven reserves, and the industrial reserves rank first in the world, providing unique conditions for the development of my country's rare earth industry. As an important rare earth nano-oxide, cerium oxide is widely used in automobile exhaust purification, chemical mechanical polishing, fuel cells and other fields due to its good oxygen storage capacity and special structure. [0003] With the de...

AI Technical Summary

Problems solved by technology

People tried to use various methods to design and synthesize spherical cerium oxide microstructures in various forms: Chinese patent CN1699282 proposed a method for preparing monodisperse spherical cerium oxide, but the obtained cerium oxide balls were precipitated and the particle size was large enough to reach submicron (300nm); Chinese patent CN101117233 proposes the preparation method of mesoporous cerium dioxide microspheres, and the particle diameter of the gained precipitated cerium dioxide mesoporous balls is also relatively large and uneven in appearance; Chinese patent CN1371867A proposes a kind of cerium oxide A method for preparing cerium oxide sol, but the method has harsh conditions and complicated procedures, and the particle size of the obtained cerium oxide particles is uneven (6-200nm); Chinese patent CN101092246A proposes a method for preparing cerium oxide sol, which is cumbersome. What is obtained is cerium oxide particles; literature (Jimmy C.Yu, et al.Chem.Mater.2005, 17, 4514-4520) reports a method for preparing cerium oxide nanospheres, but the results are all precipitated cerium oxide ball and the size is uncontrollable; in addition, although the literature (Daniel Andreescu, et al.Colloids and Surfaces A: Physicochem.Eng.Aspects 2006,291,93-100) has reported a preparation method of colloidal cerium oxide balls, but The obtained cerium oxide ball particles are relatively large, with a particle size of 1-3 μm

In summary, it is challenging to effectively synthesize cerium oxide nanospheres with small particle size, controllable size, and excellent stability.

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