Rapid preparation method of insoluble single-layer graphene by microwave radiation

Abstract

The invention discloses a method for rapidly preparing insoluble single-layer graphene by microwave radiation. The method comprises the following steps: (1) expanded graphite, sodium persulfate, sodium vanadate and H5PMo10V2O40 are stirred and react at high temperature; (2) after the reaction, vacuum suction filtration is conducted, a filter cakes is washed to neutral, and the filter cake is dried naturally; (3) the filter cake is oxidized to obtain graphene oxide GO; (4) vacuum suction filtration is conducted again, a filter cake is washed to neutral, and the washed filter cake undergoes ultrasonic treatment in deionized water; (5) suction filtration is conducted after ultrasonic treatment, and a filtrate is taken; (6) the filtrate is reduced; and (7) a suspension obtained after reduction is dried so as to obtain a flaky solid graphene RGO. The method provided by the invention is simple and low-cost, requires no photocatalyst or reducing agent, and is adopted to realize large-scale production of stable and environmentally-friendly insoluble graphene.

Description

technical field [0001] The invention relates to a method for preparing single-layer graphene, in particular to a method for preparing insoluble graphene. Background technique [0002] The graphite oxide reduction method is currently the most popular method for preparing graphene. The reducing agents used mainly include hydrazine hydrate, sodium borohydride, p-phenylenediamine, etc. Although these reducing agents can effectively reduce graphene oxide, their huge Toxicity, long reduction reaction time (more than 1 hour), and longer time to prepare graphite oxide in the first step (more than 20 hours), all of which limit its promotion and application. Recently, some people have successively used green oxidants such as ascorbic acid, glucose, citric acid, amino acids, sulfides, etc., but their reducing effect is not as good as hydrazine hydrate. Moreover, previous studies have shown that this method leads to the introduction of some impurities and residual reducing agents in th...

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Problems solved by technology

[0002] The graphite oxide reduction method is currently the most popular method for preparing graphene. The reducing agents used mainly include hydrazine hydrate, sodium borohydride, p-phenylenediamine, etc. Although these reducing agents can effectively reduce graphene oxide, their huge Toxicity, long reduction reaction time (more than 1 hour), and longer time to prepare graphite oxide in the first step (more than 20 hours), all of which limit its promotion and application

Recently, some people have successively used green oxidants such as ascorbic acid, glucose, citric acid, amino acids, sulfides, etc., but their reduction effect is not as good as that of hydrazine hydrate.

Moreover, previous studies have shown that this method leads to the introduction of some impurities and residual reducing agent in the graphite dispersion

In addition, the reduction of graphene oxide (GO) dispersion after ultrasonication leads to a significant decrease in its hydrophilicity and eventually leads to their irreversible aggregation and precipitation, which will greatly affect the excellent performance of graphene.

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