A kind of method that utilizes graphene oxide of low impurity content to prepare graphene

Abstract

The invention provides a method for preparing graphene by using graphene oxide with low impurity content, the method comprising: purifying the object of purification to obtain purified graphene oxide; freezing the purified graphene oxide Drying treatment to obtain graphene oxide with a low number of layers; reducing the graphene oxide with a low number of layers to obtain graphene, wherein the purification object is graphene oxide having a first number of layers combined with impurity ions on the functional group, The number of the first layers is more than ten to tens of layers. The present invention utilizes the gravitational effect of the low-layer graphene oxide itself, completes the preparation of graphene by setting different temperature zones and pressure zones, avoids the problem of uneven heating in the reaction process of the low-layer graphene oxide, and can remove the While removing a large number of oxygen-containing functional groups carried by graphene oxide while removing metal and non-metal impurities, the prepared graphene has low impurity content and few structural defects.

Description

technical field [0001] The invention relates to the technical field of new material preparation, and more specifically, relates to a method for preparing graphene by using graphene oxide with low impurity content. Background technique [0002] In current industrial production, graphene oxide powder can be produced on a large scale by applying the oxidation intercalation method. The graphene oxide slurry produced by the oxidation intercalation method contains a large amount of impurity ions, and the existing graphene oxide has problems such as low efficiency and poor washing effect in the purification process; the number of layers in the produced graphene oxide is also large, That is, the quality of the produced graphene oxide is not high. Moreover, due to the poor thermal stability of graphite oxide, pyrolysis often occurs during the drying process, and the graphite oxide after heating and drying tends to agglomerate into hard blocks, which is not conducive to subsequent di...

AI Technical Summary

Problems solved by technology

However, in the method for preparing graphene, on the one hand, the graphene prepared by redox method is easy to destroy its own crystal structure in the process of oxidative intercalation, which leads to the increase of internal defects in graphene, to a large extent affect the performance of graphene; on the other hand, there are still a lot of metal and non-metal impurities in graphene produced by redox method, which further affects the large-scale development and application of graphene

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