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Preparation method of graphene and graphene

A graphene and biomass material technology, applied in the field of carbon materials, can solve the problems of graphene surface damage, easy to pollute the environment, difficult to meet large-scale needs, etc., to achieve high electrical conductivity and electrochemical performance, high specific surface area, Good electrical conductivity

Active Publication Date: 2015-03-04
NINGBO GRAPHENE INNOVATION CENT CO LTD
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Problems solved by technology

Among these methods, the preparation efficiency of mechanical exfoliation method and epitaxial growth method is very low, and it is difficult to meet the needs of large-scale
Although the chemical vapor deposition method can obtain large-scale continuous graphene films, it is suitable for micro-nano electronic devices or transparent conductive films, but it cannot meet the large-scale needs of energy storage materials and functional composite materials.
The preparation of graphene material powder by oxidation-reduction method is relatively easy to realize, and is a common method for preparing graphene material powder, but this method uses a large amount of strong acid and oxidant in the process of preparing graphene, which seriously damages the graphene surface and is easy to It pollutes the environment, so it is not suitable for large-scale industrialized graphene preparation

Method used

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preparation example Construction

[0035] The invention provides a kind of preparation method of graphene, comprises the following steps:

[0036] A) Pretreating the biomass material to obtain a pretreated biomass material, the biomass material including one or more of agricultural and forestry waste, tea and seaweed plants;

[0037] B) mixing a metal catalyst, a solvent and the pretreated biomass material in the step A) to obtain a catalyst-loaded biomass material;

[0038] C) mixing the pore-forming agent with the catalyst-loaded biomass material obtained in step B), and heating at 700-1200° C. to obtain graphene.

[0039] The preparation method of graphene provided by the invention adopts biomass material as a carbon source, which reduces the cost of graphene and is beneficial to large-scale industrial production of graphene.

[0040] In the invention, the biomass material is pretreated to obtain the pretreated biomass material. The present invention preferably carries out pretreatment to described biomass...

Embodiment 1

[0077] Wash and dry Sargassum and crush it through a 60-mesh sieve, then soak 10g of Sargassum powder in 1000ml of 1mol / L sodium periodate aqueous solution, treat it at 50°C for 2h, and then dissolve the obtained product in 1000ml Concentration is the ethanol solution of the sodium hydroxide of 1mol / L, wash and dry after soaking at room temperature for 1h, obtain the pretreated Sargassum;

[0078] Add 5 g of pretreated Sargassum powder into 100 mL of aqueous solution containing 10 g of nickel acetate, stir for 6 hours, wash with deionized water and dry at 80 ° C to obtain Sargassum loaded with catalyst;

[0079] Mix the catalyst-loaded Sargassum with KOH, the mass ratio of the catalyst-loaded Sargassum to KOH is 2:1, add a small amount of water, let stand for 8 hours, and then blow dry at 120°C for 12 hours to obtain a dry product;

[0080] Then the obtained dried product was placed in a tube furnace, kept at 850° C. for 2 hours under an argon protective atmosphere, and taken ...

Embodiment 2

[0085] Wash and dry Sargassum and crush through a 60-mesh sieve, then soak 50g of Sargassum powder in 1000ml of 1mol / L KMnO 4 The solution was treated in an aqueous solution at 80°C for 2 hours, and then the obtained product was soaked in 1000 ml of ethanol solution of sodium hydroxide with a concentration of 0.8 mol / L at room temperature for 1 hour, then washed and dried to obtain pretreated Sargassum powder;

[0086] Take 10g pretreated Sargassum powder and 500mL containing 50g K 3 [Fe(CN) 6 ] aqueous solution, stirred for 6 hours, washed with deionized water and dried at 80°C to obtain Sargassum powder loaded with catalyst;

[0087] Mix the catalyst-loaded Sargassum powder with KOH, the mass ratio of the catalyst-loaded Sargassum powder to KOH is 5:1, add a small amount of water, let stand for 8 hours, and then blow dry at 100°C for 10 hours to obtain a dry product;

[0088] Then the obtained dried product was placed in a tube furnace, kept at 850° C. for 2 hours under an...

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Abstract

The invention provides a preparation method of graphene. The method comprises the following steps: (A) pretreating biologic materials to obtain the pretreated biologic materials, wherein the biologic materials comprise one or several kinds of forestry and agricultural residues, tea leaves and seaweed plants; (B) mixing metal catalysts, solvents and the biologic materials pretreated in the step (A) to obtain the biologic materials loaded with the catalysts; (C) mixing pore forming agents and the biologic materials which are obtained in the step (B) and loaded with the catalysts, and heating for 0.5 to 10 hours under the temperature of 700-1200 DEG C to obtain the graphene. The preparation method for the graphene, provided by the invention, has no pollution to environment, the biologic materials are used as carbon sources, the cost of the raw materials of the carbon sources is low, and the raw materials are easy to obtain, so that the problems that the cost of existing carbon sources is high, and existing carbon sources are not beneficial to the large-scale industrialization are solved.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, in particular to a graphene and a preparation method thereof. Background technique [0002] Graphene is a single-layer sheet structure composed of carbon atoms and a two-dimensional material with a thickness of only one carbon atom. Graphene has shown excellent performance in many aspects. For example, graphene is almost completely transparent, absorbing only 2.3% of light, and its light transmission is very good; the thermal conductivity of graphene is as high as 5300W / m K, which is higher than Carbon nanotubes and diamonds; the electron mobility of graphene at room temperature exceeds 15,000 cm 2 / V s, which is higher than that of carbon nanotubes and silicon crystals; the resistivity of graphene is only 10 -6 Ω·cm, lower than copper or silver, is currently the material with the smallest resistivity; in addition, graphene is also the thinnest but hardest material. The preparation of...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 周旭峰刘兆平沈鲁恺郑超王国华姜萍吕彬彬
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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