Preparation method of graphene oxide

Abstract

The invention relates to the technical field of graphene manufacturing, in particular to a preparation method of graphene oxide. The preparation method comprises the following steps: 1, mixing concentrated sulfuric acid and phosphoric acid in a mass ratio of 5: 1 to obtain mixed acid; 2, taking a certain amount of mixed acid, adding natural crystalline flake graphite powder with the mesh number of 100-5000, stirring and dispersing, and then adding potassium permanganate; 3, continuously stirring and reacting the materials in warm water at 20-60 DEG C; 4, maintaining the temperature of the mixture at 85-99 DEG C, and then adding hydrogen peroxide under a stirring condition to remove residual potassium permanganate; 5, separating the solution prepared in the step 4 by using a centrifugal machine; 6, adding a certain amount of deionized water into the precipitate obtained in the step 5, stirring and dispersing, and introducing into a homogenizer for uninterruptedly and circularly stripping; 7, separating the material obtained in the step 6 by using the centrifugal machine, and washing once by using hydrochloric acid and deionized water respectively; 8, separating the washed solids by using the centrifugal machine; the raw materials are cheap and easy to obtain, operation is safe, dispersity is good, and industrial production is facilitated.

Description

technical field [0001] The invention relates to the technical field of graphene manufacture, in particular to a preparation method of graphene oxide. Background technique [0002] The commonly used method to prepare graphene oxide by chemical method is the Hummers method. The principle is to first treat graphene with strong acid to transform it into a graphite interlayer compound, and then add a strong oxidant for deep exfoliation, and adjust the oxidation degree of the product by controlling the reaction time , which is measured by the atomic ratio of C and O; although it is widely used, the oxidation degree of graphene oxide prepared by this process is not high, and the use of excessive KMnO4 increases the difficulty of subsequent waste liquid treatment, so people continue to try Improving the Hummers method, such as the ultrasonic-assisted Hummers method, although the method is convenient and quick, the equipment is expensive and difficult to maintain, which is not conduc...

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Problems solved by technology

[0002] The commonly used method to prepare graphene oxide by chemical method is the Hummers method. The principle is to first treat graphene with strong acid to transform it into a graphite interlayer compound, and then add a strong oxidant for deep exfoliation, and adjust the oxidation degree of the product by controlling the reaction time , which is measured by the atomic ratio of C and O; although it is widely used, the oxidation degree of graphene oxide prepared by this process is not high, and the use of excessive KMnO4 increases the difficulty of subsequent waste liquid treatment, so people continue to try Improving the Hummers method, such as the ultrasonic-assisted Hummers method, although this method is convenient and quick, the equipment is expensive and difficult to maintain, which is not conducive to industrialization

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