Preparation method of nanoscale cobaltosic oxide

Abstract

The invention relates to the technical field of nano materials, and discloses a preparation method of nano-scale cobaltosic oxide, which comprises the following steps: preparing porous spherical micron-scale cobaltosic oxide particles by hydrothermal method-high temperature calcination, the cobaltosic oxide being composed of many nano ions, and being fragile in structure and liable to break; crushing the micron-scale cobaltosic oxide into nano-particles through a ball milling method. The conditions such as a ball milling solvent, the diameter of balls and the rotating speed are strictly controlled, so that agglomeration of the nano-particles can be effectively avoided, and the average particle size of the cobaltosic oxide is reduced to 100 nanometers or above; the method is simple in process and beneficial to industrial production.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a preparation method of nanometer cobalt trioxide. Background technique [0002] Cobalt tetraoxide, a group VIII oxide belonging to the P-type semiconductor, has relatively good empty electron orbits, so electron pairs are easier to fuse with it. Therefore, cobalt tetraoxide is a transition metal oxide with excellent performance and can be used as a catalyst. Existing studies have shown that the particle size and morphology of cobalt tetroxide also have a great influence on its catalytic performance. Nano-cobalt tetroxide is expected to have better performance than large particles of cobalt tetroxide. And pigments and other aspects have important application value. [0003] The method for preparing nanometer cobalt trioxide can be divided into physical method and chemical method. The physical method is simple to operate, and the obtained particles have high purity a...

AI Technical Summary

Problems solved by technology

Usually cobalt tetroxide prepared by hydrothermal method will use a cobalt salt and a precipitant as the precursor solution, and put the mixture into the reaction kettle (providing a high temperature and high pressure environment), and cobalt carbonate of various shapes can be prepared, and then prepared by high temperature calcination Obtain pure spherical cobalt tetroxide powder; but there are the following problems in this process: ① It is difficult to obtain tricobalt tetroxide nanoparticles by general hydrothermal method; ② there is still a small amount of cobalt tetroxide that will cluster together

[0004] Although the ball milling method can reduce the particle size, it is found in the process of research that it is difficult to obtain nanoparticles with a small enough particle size by ball milling cobalt tetroxide by conventional ball milling. It is difficult to ball mill to the nanometer level, so high-speed ball milling is often used; 2) Cobalt tetroxide that is ball-milled to the nanometer level is easy to agglomerate

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