Preparation method of graphene oxide/manganese dioxide composite material

Abstract

The invention provides a preparation method of a graphene oxide / manganese dioxide composite material. The method comprises the following steps of firstly mixing graphite, an intercalator, an oxidant and water and then reacting to obtain a graphene solution which is not completely oxidized; and then mixing the graphene solution which is not completely oxidized in the previous step and a manganese source again and reacting to obtain the graphene oxide / manganese dioxide composite material. According to the preparation method provided by the invention, a hydrogen peroxide reduction process, a later separate oxidation reduction process and a repeated cleaning process are not needed; and after intercalation and exfoliation of graphite, a one-step oxidation-reduction hydrothermal method is directly utilized to prepare the composite material in situ on the basis of incomplete oxidation, so that the operation steps are greatly reduced, the energy consumption is reduced, the exfoliation time is shortened and the structure dispersity of the composite material is also improved. The preparation method is simple in process, mild in condition, safe, environment-friendly and suitable for large-scale industrial production; and the composite material has relatively good wave absorbing property and absorption width.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, and in particular relates to a preparation method of a graphene oxide / manganese dioxide composite material. Background technique [0002] Electromagnetic pollution refers to natural and artificial interference of various electromagnetic waves and harmful electromagnetic radiation. Due to the development of radio, television, and microwave technology, the power of radio frequency equipment has doubled, and the electromagnetic radiation on the ground has increased significantly, which has reached the level of direct threat to human health. The alternating changes of electric and magnetic fields produce electromagnetic waves. The phenomenon of electromagnetic waves launching or sinking into the air is called electromagnetic radiation. Excessive electromagnetic radiation causes electromagnetic pollution. [0003] With the rapid development of microwave and communication technology,...

AI Technical Summary

Problems solved by technology

[0006] Both methods are complicated. The Hummers method has complicated steps, and needs to undergo low-temperature, medium-temperature, and high-temperature reaction processes, frequent heating and cooling, multiple feedings, cumbersome operations, and a long production cycle; the modified Hummers method requires about 8 hours of precipitation. process, the production cycle is long; and in the process of preparing composite materials, two strong oxidation reactions and reduction reactions occur, resulting in serious stacking and overlapping between graphene sheets. At the same time, a large amount of reducing agents such as hydrazine hydrate may be used. Potential risks of polluting the environment and poisoning human health

The traditional preparation method not only has complicated process steps, but also has high requirements for production equipment, making it difficult to realize large-scale production and application

In addition, the preparation of graphene oxide also requires 6-8 days of intercalation and stripping time, resulting in high production costs.

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