Method for synthesizing nano cerium oxide with different morphologies by hydrothermal method

Abstract

The patent refers to the field of 'compounds of the metals beryllium, magnesium, aluminium, calcium, strontium, barium, radium, thorium, or of the rare-earth metals'. The invention belongs to the technical field of nanomaterials, and in particular relates to a method for synthesizing nano cerium oxide with different morphologies by a hydrothermal method. The method comprises the following steps of: 1) preparing aqueous solution of Ce(NO3).6H2O with concentration of 0.01 to 0.1mol / L at the room temperature; 2) adding H2O2, aqueous solution of cerium nitrate and an organic solvent into the solution to form mixed solution according to a volume ratio of 1:1-8:1-10, wherein the organic solvent can be volatized into gas at the reaction temperature and does not participate in the reaction; 3) placing the mixed solution into a high-temperature reaction kettle and reacting the mixture at the temperature of between 140 and 240 DEG C for 2 to 72 hours; and 4) pouring off upper solution after the reaction and adding ethanol for dispersion, wherein the nano cerium oxide is directly settled at the bottom of the reaction kettle. Because any surfactant is not added, and residues are not remained after hydrogen peroxide serving as an oxidant is added for reaction, the post-treatment process required by the conventional nano preparation process can be saved and the industrial application of the nanomaterial is dramatically promoted.

Description

technical field [0001] The invention belongs to the technical field of nanometer material preparation, and in particular relates to a method for synthesizing nanometer cerium oxides with different shapes by a hydrothermal method. Background technique [0002] Due to the quantum mechanical effect of nanoparticles endowed by the size scale of nanoparticles, nanomaterials are quite different from traditional materials in some properties (such as optics, electricity, etc.), and are widely used in electronics, optics, chemical ceramics, biology and It has been widely used in the field of medicine. Nano-oxides are an important part of nanomaterials, and their preparation, structure, performance and application have become one of the hotspots of researchers from all over the world. Cerium oxide is an extremely versatile light rare earth oxide with N-type semiconductor properties. It is widely used in fuel cells, luminescent materials, glass decolorization clarifiers, catalysts, el...

AI Technical Summary

Problems solved by technology

[0005] 2) The preparation process is more complicated

Taking the sol-gel method as an example, precursor reactions are required, and sol-gel changes occur after standing, which requires a long period and high-temperature sintering in the later stage

[0006] 3) Post-processing is more troublesome

[0007] These disadvantages lead to the high preparation cost of nanomaterials in the preparation stage, the production cycle is too long, and it is difficult to meet the requirements of industrial production; and in the post-processing, the current existing equipment is difficult to meet the post-processing of large quantities of nanomaterials, and More processes in post-processing also greatly increase the cost

Therefore, the current preparation methods severely limit the development of nanomaterials.

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