A kind of device for preparing graphene

Abstract

The invention provides a device for preparing graphene. The device comprises a screening mechanism, a first reaction kettle, a stirring mechanism, a second reaction kettle, a bubble generating mechanism, an ultrasonic blasting mechanism, a centrifugal dehydrating mechanism, a first drying mechanism, a sintering mechanism, a third reaction kettle, a fourth reaction kettle, a second drying mechanism and a third drying mechanism. The Vander Wale force between graphite layers is primarily weakened through cracking treatment, and a stripping agent which can be inserted between the graphite layers through molecules is combined with graphite of a thin layer and the stripping effect on the graphite is realized; the bonding force between the graphite layers is weakened again through a bubble expansion and blasting manner, so as to disconnect a relation between the graphite layers, so that a mixture of the graphite, the graphene and the stripping agent is obtained; finally, after the stripping agent is removed through a separation manner and the graphene is extracted from the mixture of the graphite and the graphene through an extraction manner, so that the preparation of the graphene is finished; the device is simple in procedures and high in preparation efficiency, is environmentally friendly and has no pollution.

Description

【Technical field】 [0001] The invention belongs to the technical field of carbon materials, in particular to a device for preparing graphene. 【Background technique】 [0002] Due to its unique structure and photoelectric properties, graphene has become a research hotspot in the fields of carbon materials, nanotechnology, condensed matter physics and functional materials. Graphene is a new type of nanomaterial with the thinnest, highest strength, and strongest electrical and thermal conductivity found so far. Graphene is called "black gold" and is the "king of new materials". Its theoretical specific surface area is as high as 2630m2 / g. It can be used in effect transistors, electrode materials, composite materials, liquid crystal display materials, sensors, etc. But the main problem encountered in the process of using graphene is that it cannot be mass-produced at present. [0003] At present, there are mainly two methods for the production and preparation of graphene. One me...

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Problems solved by technology

But the main problem encountered in the process of using graphene is that it cannot be mass-produced at present

[0003] At present, there are mainly two methods for the production and preparation of graphene. One method is the mechanical exfoliation method, which uses the friction and relative motion between the object and graphene to obtain a thin layer of graphene material, but this method The efficiency and purity of obtaining graphene are extremely low, and the result is very unsatisfactory; the second method is the redox method, which is to oxidize natural graphite by using chemical reagents such as sulfuric acid and nitric acid and oxidants such as potassium permanganate and hydrogen peroxide. Increase the distance between the graphite layers, insert oxides between the graphite layers to obtain graphite oxide, then wash the reactants with water, and dry the washed solids at low temperature to obtain graphite oxide powder. Then the graphite oxide powder is peeled off by physical exfoliation, high temperature expansion and other methods to obtain graphene oxide, and finally the graphene oxide is reduced by chemical method to obtain graphene

This method is simple to operate and high in yield, but the quality of the product is low, and the prepared graphene is prone to agglomeration and difficult to disperse. Due to the presence of van der Waals interaction, graphene with a high specific surface area tends to form irreversible agglomerates, and even re- Graphene is piled up to form graphite, which affects the mass production of graphene, and also limits its application

In addition, the reducing agent used in the chemical redox method is toxic and causes certain pollution to the environment.

In addition, the redox method is complicated to operate and the equipment is expensive, so it is difficult to carry out large-scale production. The operation of the mechanical exfoliation method is cumbersome, and the amount of product obtained each time is small and the cost is high, which is not conducive to large-scale preparation.

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