Rapid Preparation of Soluble Graphene Nanosheets by Microwave Irradiation

Abstract

The invention discloses a method for microwave radiation rapid preparation of a soluble graphene nanosheet. The method comprises 1, carrying out stirring on expandable graphite, sodium persulfate, sodium vanadate, H4PW11VO40 and deionized water at a normal temperature for a reaction, 2, after the reaction, carrying out reduced pressure pumping filtration, washing the filter cake until pH is 7 and carrying out natural drying on the filter cake, 3, oxidizing the filter cake to obtain graphene oxide (GO), 4, carrying out reduced pressure pumping filtration, washing the filter cake until pH is 7 and carrying out ultrasonic treatment in deionized water, 5, adding a PAM dispersion liquid into the filter cake, carrying out ultrasonic treatment and carrying out pumping filtration, and 6, reducing the filtrate by microwave radiation to obtain the soluble graphene nanosheet. The method has a low cost, is simple and fast, does not need any photocatalyst or reducer and realizes large scale production of an eco-friendly and stable soluble graphene dispersoid.

Description

technical field [0001] The invention relates to a preparation method of graphene nanosheets, in particular to a preparation method of soluble graphene nanosheets. 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 limits 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 hydrazine hydrate, and the reaction time is long. Moreover, previous studies have shown that this method leads to the introduction of some impurities and residual reducing agents in the graphite dispersion. In addition, the reduction of graphene oxide (GO) dispersion after ultrasound leads...

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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 limits 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 hydrazine hydrate, and the reaction time is long

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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