Production method of graphene

Abstract

Belonging to the technical field of new materials, the invention provides a production method of graphene. The method solves the problems of complex production process, high production cost, severe environmental pollution and the like in existing graphene production. The production method of grapheme includes oxidation natural flake graphite and recovery of an acidic substance after oxidation. The method is characterized in that: the recovered acidic substance is further used in a next oxidation process, the recovered acidic substance and a freshly added acidic substance together compose a next oxidation solution, the acidic substance is sulfuric acid, the acidic substance separated after the oxidation process and the fresh sulfuric acid are preparation into a new round of natural flake graphite's oxidation solution according to a ratio of 1:1. The method has the advantages of simple process, low production cost and small environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of new materials, relates to a graphene, in particular to a graphene production method. Background technique [0002] Graphene is a special two-dimensional material composed of carbon atoms arranged in a hexagonal shape and connected to each other. Because of its high electrical conductivity, high mechanical strength, and large specific surface area, it can be used to prepare high-speed processors, high-speed A variety of new devices such as sensitivity sensors, touch screens, super batteries and high-efficiency solar cells have important application values ​​in various fields such as electronics, aerospace military industry, and new energy. [0003] At present, there are many reports on graphene preparation methods at home and abroad, but from the perspective of actual needs such as high-quality, low-cost mass production, most of the reported graphene preparation methods have various defects. Among them, t...

AI Technical Summary

Problems solved by technology

[0004] In the above process flow, a large amount of waste sulfuric acid is produced after solid-liquid separation in the sixth step, which will pollute the environment or generate high treatment costs. The processes after the eighth step will bring many uncertain factors to the large-scale production of graphene, especially in the The graphene produced during the reduction process and the drying process is easy to form agglomerates and make the graphene return to the graphite state, so it is difficult to obtain graphene in large-scale production

[0005] In the method, 40 tons of concentrated sulfuric acid is generally consumed per ton of graphene, and 80 tons of waste sulfuric acid are produced after the hydrolysis reaction. Since the market price of sulfuric acid is relatively low, the dilute sulfuric acid after the hydrolysis reaction has no recovery value, so the treatment of waste acid It has become a major defect in the production of graphene by the redox method. With the expansion of production capacity, there is a great threat to environmental pollution.

It has also caused the high cost of waste acid treatment in the production of graphene by redox method, which affects the reduction of production cost, thus affecting the high market price of graphene, the high cost of downstream applications, and the difficulty in forming an industrial chain.