Device and method for preparing functional graphene

Abstract

The invention discloses a device and method for preparing functional graphene. The device includes an acidification reactor, an electrochemical stripping reactor, a gas collector and a centrifugal separator. The acidification reactor is used for conducting acidification treatment on graphene columns; the electrochemical stripping reactor is used for stripping the acidified graphene columns, and multiple electrolysis units and heaters are arranged in the stripping reactor; an electrolyte is one of a (NH4)2HPO4 solution and a (NH4)2SO4 solution or a NH4NO3 solution; the gas collector is internally provided with a gas filter used for filtering oxygen from hydrogen; the centrifugal separator is used for separating powdery graphene products from the electrolyte. The method includes the steps that S1, the graphene columns and a nitric acid solution are added into the acidification reactor; S2, the acidified graphene columns are subjected to electrochemical stripping, and a constant voltage mode or a constant current mode is adopted for conducting electrolysis at the temperature not higher than 50 DEG C; S3, after electrolysis, solid powder is centrifugally separated out, drying is carried out, and then a graphene product is obtained. At an electrochemical stripping stage, an amino acid functional group is implanted, and a graphene preparation process is optimized and simplified.

Description

technical field [0001] The invention belongs to the technical field of graphene production, and in particular relates to a device and method for preparing functionalized graphene. Background technique [0002] Graphene is a material in the form of two-dimensional, one-atom-thick sheets of carbon atoms arranged in a hexagonal honeycomb lattice pattern. Graphene is of increasing interest for use in many applications such as in flexible electronics, semiconductors, and as a reinforcement in advanced materials because graphene has many unique and desirable properties, including being transparent, strong Lightweight, and an excellent conductor of heat and electricity. At present, many methods can be used to manufacture graphene, including micromechanical exfoliation of graphite, SiC pyrolytic epitaxial growth, chemical vapor deposition, and chemical redox. [0003] The above methods have their own advantages and disadvantages. For example, high-quality graphene sheets with inta...

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Problems solved by technology

[0007] Another purpose of the present invention is to solve the problem of introducing amino acid functional groups into graphene in the existing functionalized graphene preparation method, which must be surface treated after the graphene is prepared. This process is complicated, time-consuming and accompanied by a large amount of toxic waste water. technical flaws

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