Preparation method for graphite oxide with low oxidizability

Abstract

The invention relates to a preparation method for graphite oxide with low oxidizability. The preparation method comprises the following steps: adding 50 ml of concentrated sulfuric acid and 0.5 g of graphite powder into a three-neck flask, carrying out uniform mixing under stirring, then carrying out cooling to 0 DEG C in an ice-water bath, slowly adding 0.5 to 1.5 g of potassium permanganate, carrying out slow heating to 35 DEG C, allowing the above substances to undergo a reaction for 2 h, then carrying out slow heating to 70 DEG C, and carrying out a reaction for half an hour until potassium permanganate is completely consumed so as to obtain GO with low oxidizability; after completion of the reaction, adding a great amount of ice water and carrying out centrifugal sedimentation; then carrying out washing with an aqueous hydrochloric acid solution with a concentration of 10% six times and washing with deionized water three times; carrying out centrifugation and collecting a product; and drying the product in a vacuum drying oven at 60 DEG C so as to obtain graphite oxide with low oxidizability. Compared with the Brodie method and the Staudenmaier method, the preparation method has higher efficiency and does not give out toxic gas in the process of preparation. Since the speed of a reaction of potassium permanganate with graphite is fast, the purpose of reaching a low oxidation degree of GO is achieved by changing the usage amount of an oxidizing agent.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of graphite oxide with low oxidation degree. Background technique [0002] The preparation of graphene has always been a hot and difficult topic in the scientific and industrial circles. Although many methods have successfully prepared graphene, each method has its own advantages, but there are also certain disadvantages. For example, the mechanical exfoliation method can prepare graphene sheets with the most complete structure, but it is too time-consuming and labor-intensive; chemical vapor deposition (CVD) can prepare high-quality graphene films, but this method requires high equipment and costs Higher; liquid-phase ultrasonic stripping has the advantages of simple operation and convenience, but it is highly dependent on the choice of solvent. Moreover, these methods also have a common shortcoming, that is, graphene cannot be prepared on a ...

AI Technical Summary

Problems solved by technology

However, these reports did not study the exfoliation behavior of GO, nor did they characterize the exfoliated GONS. At the same time, the preparation of GO by these methods is relatively long, which is not conducive to actual production.