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Method for preparing graphene by taking coal as raw material

A graphene and raw material technology, which is applied in the field of graphene preparation using microwave pyrolysis technology and supercritical carbon dioxide technology, can solve the problems of uneven distribution and high preparation cost, and achieves a reduced production cost, low raw material cost and regular crystal structure. Effect

Inactive Publication Date: 2018-04-10
韩笑峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing graphene with coal as raw material, in order to overcome the problems of high preparation cost and uneven distribution in the current preparation of graphene

Method used

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  • Method for preparing graphene by taking coal as raw material
  • Method for preparing graphene by taking coal as raw material
  • Method for preparing graphene by taking coal as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The present embodiment 1 is tested with lignite as raw material.

[0040] (1) Evenly mix 50g of lignite powder with particle size less than 0.221mm, 10g of kaolinite and 10g of sodium carbonate, and dry in a vacuum drying oven;

[0041] (2) Place the dried sample in a microwave pyrolysis reactor, set the microwave power of the reactor to 400W, the final temperature to 400°C, and the reaction time to 15min, then continue to heat up to 1000°C, and the microwave power to 1000W, The reaction time is 10 minutes;

[0042] (3) After the reaction, cool the reactor to room temperature, take out the reaction material, wash it with 0.1mol / L potassium permanganate cleaning solution, dry it, and then clean it again in an ultrasonic cleaner with an ultrasonic frequency of 30KHz and a power of It was 130W, and the ultrasonic cleaning time was 15min, and sample A was obtained;

[0043] (4) Mix the sample A and the dispersant sodium alkylbenzene sulfonate at a mass ratio of 2:1, put t...

Embodiment 2

[0046] In Example 2, long-flame coal was used as the raw material for testing.

[0047] (1) After uniformly mixing 50g of long-flame coal powder with a particle size of less than 0.221mm, 10g of kaolinite and 10g of sodium carbonate, place it in a vacuum drying oven to dry;

[0048] (2) Place the dried sample in a microwave pyrolysis reactor, set the microwave power of the reactor to 400W, the final temperature to 400°C, and the reaction time to 15min, then continue to heat up to 1000°C, and the microwave power to 1000W, The reaction time is 10 minutes;

[0049] (3) After the reaction, cool the reactor to room temperature, take out the reaction material, wash it with 0.1mol / L potassium permanganate cleaning solution, dry it, and then clean it again in an ultrasonic cleaner with an ultrasonic frequency of 30KHz and a power of It was 130W, and the ultrasonic cleaning time was 15min, and sample A was obtained;

[0050] (4) Mix the sample A and the dispersant sodium alkylbenzene...

Embodiment 3

[0053] In Example 3, the mixed sample of lignite and long-flame coal is used as raw material

[0054] (1) After uniformly mixing 25g of lignite powder with a particle size of less than 0.221mm, 25g of long-flame coal powder, 10g of kaolinite and 10g of sodium carbonate, place it in a vacuum drying oven to dry;

[0055] (2) Place the dried sample in a microwave pyrolysis reactor, set the microwave power of the reactor to 400W, the final temperature to 400°C, and the reaction time to 15min, then continue to heat up to 1000°C, and the microwave power to 1000W, The reaction time is 10 minutes;

[0056] (3) After the reaction, cool the reactor to room temperature, take out the reaction material, wash it with 0.1mol / L potassium permanganate cleaning solution, dry it, and then clean it again in an ultrasonic cleaner with an ultrasonic frequency of 30KHz and a power of It was 130W, and the ultrasonic cleaning time was 15min, and sample A was obtained;

[0057] (4) Mix the sample A a...

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Abstract

The invention discloses a method for preparing graphene by taking coal as a raw material, and in particular relates to a method for preparing graphene by utilizing a microwave pyrolysis technology anda supercritical carbon dioxide technology. The method comprises the following steps: by taking low-rank coal as a raw material, matching with a certain proportion of a microwave absorber and a catalyst, drying after uniformly mixing, placing the mixture in a microwave pyrolysis reactor, carrying out two stages of reaction at a final temperature of 400-650 DEG C and a final temperature of 800-1000DEG C, then cleaning, mixing cleaned samples with a dispersant and then placing the mixture in a supercritical carbon dioxide medium for reaction, and cleaning after the completion of the reaction toobtain thin-layer graphene. According to the method, the production cost of graphene can be significantly reduced, the process is simple, in the product quality is high, sources of raw materials arewide, and the method has good economical and social benefits.

Description

technical field [0001] The invention relates to a method for preparing graphene by using coal as a raw material, in particular to a method for preparing graphene by using microwave pyrolysis technology and supercritical carbon dioxide technology. Background technique [0002] Since graphene was discovered, as a new type of carbonaceous nano-2D material, it has been favored by researchers in the fields of physics and materials. Graphene is a material with a single-layer sheet structure composed of carbon atoms. It exhibits excellent properties in many aspects, such as electrical conductivity and light transmission properties, making it a very promising application prospect in transparent conductive electrodes. It is applied to touch screens, liquid crystal displays, organic light-emitting diodes, etc.; due to its extremely high surface area-to-mass ratio, graphene can be used for conductive electrodes in supercapacitors; due to graphene's modifiable chemical functions, large ...

Claims

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Application Information

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IPC IPC(8): C01B32/184
CPCC01B2204/04C01P2002/82C01P2004/03C01P2004/04Y02P20/54
Inventor 韩笑峰姜敏王俊马良李晓楠
Owner 韩笑峰
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