Preparation method of graphene oxide

Abstract

The invention provides a preparation method of graphene oxide, and belongs to the field of material preparation. The method comprises the following steps: (1) carrying out plasma sputtering on graphite to obtain modified graphite; (2) adding potassium permanganate into concentrated sulfuric acid, and uniformly mixing to obtain a mixture A; (3) adding the modified graphite in the step (1) into the mixture A to obtain a mixture B; (4) reacting the mixture B at 25-60 DEG C for 2-6 hours to obtain a mixture C; (5) adding the mixture C into ice water, adding hydrogen peroxide, and uniformly mixing; and (6) adding water into the product obtained in the step (5), and washing until the product is neutral, thereby obtaining the precipitate, namely the graphene oxide. The stripping yield of the graphene oxide reaches up to 95% or above, and the dosage of concentrated sulfuric acid and potassium permanganate is effectively reduced. The method is high in stripping yield, low in cost, small in danger, rapid and simple in reaction process and very suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a preparation method of graphene oxide. Background technique [0002] In the past ten years, two-dimensional materials such as graphene, molybdenum disulfide, and black scale have attracted extensive attention because of their excellent optical, electrical, magnetic, and thermal properties. At present, many literatures at home and abroad have reported that two-dimensional materials have great application potential in the fields of catalysis, energy storage, heat conduction, and metal corrosion protection. For large-scale application, the most fundamental problem is to solve the problem of low-cost preparation of two-dimensional materials. [0003] Since single-layer graphene was produced by tape tearing method in 2004, inspired by this, many researchers have developed many methods for producing two-dimensional nanosheets: such as ion exchange stripping method, liq...

AI Technical Summary

Problems solved by technology

However, when water is added, especially at higher temperatures, prolonged reaction times lead to some disadvantages

For example, cracks and holes appear in the GO layer, which leads to the fracture of GO due to excessive oxidation

In addition, water-enhanced oxidation usually produces a large number of irreparable defects at the edges, which seriously damages the structural integrity of reduced GO (rGO)

However, if no water is added during the reaction, the stripping yield of GO will be reduced.

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