A kind of preparation method of graphene oxide/manganese dioxide composite material

Abstract

The invention provides a kind of preparation method of graphene oxide / manganese dioxide composite material, comprises the following steps, at first react after graphite, intercalation agent, oxidizing agent and water are mixed, obtain the graphene solution of incomplete oxidation; Then The graphene oxide / manganese dioxide composite material is obtained after the incompletely oxidized graphite solution and the manganese source obtained in the above steps are mixed and reacted again. The preparation method provided by the present invention does not need to undergo hydrogen peroxide reduction, a separate oxidation-reduction process and repeated cleaning processes in the later stage. After intercalation and exfoliation of graphite, on the basis of incomplete oxidation, one-step oxidation-reduction hydrothermal method is directly used to prepare in situ The composite material greatly reduces the operation steps, reduces the energy consumption, reduces the stripping time, and also improves the structural dispersion of the composite material. The invention has simple process, mild conditions, safety and environmental protection, is suitable for large-scale industrial production, and the composite material has better wave-absorbing performance 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,...

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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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