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Method for preparing graphene from limestone

A graphene and limestone technology, applied in the field of graphene preparation, can solve the problems of complex process, highly toxic chemicals and high cost, and achieve the effects of simple preparation process, wide sources and low cost

Active Publication Date: 2012-07-18
FANGDA CARBON NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Purpose of the present invention In order to overcome prior art in the process of preparing graphene, use highly toxic chemicals, the shortcoming of high cost and complex process, the present invention provides a kind of method that takes limestone as raw material to prepare graphene

Method used

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  • Method for preparing graphene from limestone

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Experimental program
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Effect test

Embodiment 1

[0014] Example 1: A method for preparing graphene using limestone as a raw material, including the following steps:

[0015] 1) Mix and grind powders of calcium carbonate and magnesium metal powder with a mass ratio greater than 100:48, and the grinding time is 30 minutes;

[0016] 2) Put the powder of step 1) into a high-temperature furnace, heat up to 1000℃ within 6 hours under the protection of argon gas 60ml / min, react at 1000℃ for 40 minutes, and then cool to room temperature under the protection of argon gas , The gray powder is obtained;

[0017] 3) Reacting the obtained gray powder with a hydrochloric acid solution with a hydrogen ion concentration of 3 mol / L for 20 minutes, and then washing with distilled water to neutrality, to obtain high-purity graphene. Then it is washed with distilled water to neutrality to obtain high-purity graphene.

[0018] The resulting graphene SEM such as figure 1 As shown, TEM is like figure 2 As shown, the Raman spectrum is as image 3 Shown....

Embodiment 2

[0023] Embodiment 2: A method for preparing graphene using limestone as a raw material, including the following steps:

[0024] 1) Mix and grind powders of calcium carbonate and metal magnesium powder with a mass ratio greater than 100:52, and the grinding time is 40 minutes;

[0025] 2) Put the powder of step 1) into a high temperature furnace, heat up to 800℃ within 5 hours under the protection of argon gas 62ml / min, react at 800℃ for 60 minutes, and then cool to room temperature under the protection of argon gas , The gray powder is obtained;

[0026] 3) Reacting the obtained gray powder with a sulfuric acid solution with a hydrogen ion concentration of 2 mol / L for 40 minutes, and then washing with distilled water to neutrality, to obtain high-purity graphene.

Embodiment 3

[0027] Embodiment 3: A method for preparing graphene using limestone as a raw material, including the following steps:

[0028] 1) Mix and grind powders of calcium carbonate and magnesium metal powder with a mass ratio greater than 100:55, and the grinding time is 30 minutes;

[0029] 2) Put the powder of step 1) into a high temperature furnace, heat up to 1100°C within 4 hours under the protection of argon gas 65ml / min, react at 1100°C for 30 minutes, and then cool to room temperature under the protection of argon gas , The gray powder is obtained;

[0030] 3) Reacting the obtained gray powder with a nitric acid solution with a hydrogen ion concentration of 4 mol / L for 30 minutes, and then washing with distilled water to neutrality, to obtain high-purity graphene.

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Abstract

The invention relates to a method for preparing graphene from limestone. The method for preparing the graphene from the limestone is mainly characterized by comprising the following steps: 1) mixing and grinding calcium carbonate and metal magnesium powder according to the mass ratio of 100:(48-55) for 10 to 40 minutes; 2) placing the powder obtained in the step 1) into a high-temperature furnace, heating to 800 to 1,100 DEG C within 4 to 6 hours under the protection of argon with the flow speed 60 to 65 ml / min, reacting at the temperature of between 800 and 1,100 DEG C for 30 to 60 minutes, and cooling to be the room temperature under the protection of the argon to obtain gray powder; and 3) reacting the obtained gray powder with acidic solution with the hydrogen ion concentration of 2 to 6 mol / l for 20 to 40 minutes and washing to be neutral by using distilled water to obtain high-purity graphene. Compared with the prior art, the method has the advantages of simple preparation technology process, wide sources of raw materials, low cost, high safety and environmental friendliness.

Description

Technical field [0001] The invention relates to a method for preparing graphene by using limestone as a raw material. Background technique [0002] Graphene is a new type of carbon material obtained by densely packing a single layer of carbon atoms. It is the thinnest material in nature. Graphene is made up of carbon atoms through sp 2 The honeycomb two-dimensional grid structure formed by hybridization has a thickness of only 0.335nm. The carbon atoms are connected by strong δ bonds. Each carbon atom contributes an unbonded π electron. These π electrons are perpendicular to the plane. The direction of forming a π orbital. π electrons move freely in the crystal, so that graphene has good electrical and thermal conductivity. Graphene has many special properties beyond traditional graphite-carbon materials, and is the material with the highest strength, electrical conductivity and thermal conductivity known to man. To realize the wide application of graphene in many fields, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/184
Inventor 王万平赵建国张桂兰
Owner FANGDA CARBON NEW MATERIAL CO LTD
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