Visible light reduction method for synthesizing insoluble graphene

Abstract

The invention discloses a method for synthesizing insoluble graphene by virtue of visible light reduction. The method comprises the following steps: (1) carrying out a stirring reaction on expanded graphite, sodium persulfate, sodium vanadate and phosphotungstic acid at normal temperature; (2) after the reaction, carrying out reduced pressure suction filtration, washing a filter cake to be neutral, and naturally drying the filter cake; (3) oxidizing the filter cake, so as to obtain graphene oxide GO; (4) carrying out reduced pressure suction filtration again, washing the filter cake to be neutral, and carrying out ultrasonic treatment on the filter cake in deionized water; (5) after the ultrasonic treatment, carrying out suction filtration, and extracting filtrate; (6) reducing the filtrate; and (7) drying suspension liquid obtained after the reduction, so as to obtain sheet-shaped solid graphene RGO. The method is low in cost, simple and convenient; no photocatalyst or reductant is required to be used, and the large-scale production of environmental-friendly insoluble graphene is achieved.

Description

technical field [0001] The invention relates to a synthesis method of graphene, in particular to a synthesis method of 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, these have limited its popularization 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 the graphite dispersion. In addition, the reduction of graphene oxide (GO) dispersion after ultrasound leads to a significant decrease in its ...

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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, which limits 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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