Graphene preparation method and mass production device

Abstract

The invention discloses a graphene preparation method and a mass production device. The graphene preparation method comprises the following steps: adding graphite powder, a weak acid or a weak alkaliand water into a microwave reaction kettle, stirring, and wetting to obtain a graphite turbid liquid; carrying out microwave peeling in the microwave reaction kettle, carrying out mechanical peeling in a mechanical peeling device, circulating microwave and / or mechanical peeling according to demands to obtain a graphene turbid liquid; carrying out suction filtration, washing and drying by using a cleaning and drying device to obtain graphene powder, wherein the weak acid or the weak alkali is one or more of tannic acid, sodium gluconate and hydrogen peroxide; the ratio of the graphite powder tothe weak acid or the weak alkali to the water is (1-10g):(0.1-1g):(0.5-1L); and the temperature of mechanical peeling is 60 DEG C or less. No strong acid, strong alkali or strong oxidant is needed tobe introduced to oxidize or intercalate graphite / graphene; raw materials are safe and environmentally-friendly, wide in source and low in cost; no waste acid, wastewater, waste gas or pollution is generated in the preparation process, in addition, on-scale production is achieved, and the equipment cost is low.

Description

Technical field [0001] The invention relates to the technical field of preparing graphene, in particular to a fast and environmentally friendly preparation method and mass production device of graphene. Background technique [0002] Graphene is a kind of sp 2 The hybrid orbitals are composed of hexagonal two-dimensional carbon nanomaterials with honeycomb lattices, which have excellent optical, electrical and mechanical properties, and have important application prospects in materials science, micro-nano processing, energy, biomedicine, and drug delivery. It is considered to be a revolutionary material in the future. [0003] The physicists Andre Gaim and Konstantin Novoselov of the University of Manchester in the United Kingdom successfully separated graphene from graphite powder by using the micromechanical exfoliation method, and thus jointly won the 2010 Nobel Prize in Physics. [0004] The common production methods of graphene are SiC epitaxial growth method, chemical vapor dep...

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Problems solved by technology

These two methods belong to the bottom-up method. Graphene can be obtained from scratch, and high-quality graphene can be obtained, but this method requires high equipment, high cost, and low output.

[0006] The mechanical exfoliation method is to use the friction and relative motion between the object and graphene to obtain a graphene thin layer material; the redox method is to oxidize natural graphite powder by using chemical reagents such as sulfuric acid and nitric acid and oxidants such as potassium permanganate. , increase the distance between graphite powder layers, insert oxides between graphite powder layers and layers to obtain graphite oxide powder (Graphite Oxide), then peel off graphite oxide powder to obtain graphene oxide, and finally Graphene oxide is reduced by chemical methods to obtain reduced graphene oxide (RGO). These two methods belong to the top-down method, and the number of graphite layers is from thick to thin. The reduction method needs to carry out the functionalization (carboxylation, epoxidation, hydroxylation) of graphene raw materials, and introduces strong acid, strong base or strong oxidizing agent to chemically oxidize or chemically intercalate graphite powder, but the safety of strong acid and strong base and Environmental protection is very poor,

[0007] In summary, due to the problems of high cost, poor safety and environmental protection, and inability to mass-produce existing graphene preparation methods, the application and development of graphene are restricted.

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