Preparation method of aqueous single-layer graphene solution

A technology of alkene aqueous solution and single-layer graphite, which is applied in the field of graphene, can solve the problems of incomplete reduction, poor electrical performance, small ratio of carbon to oxygen, etc., and achieve the advantages of full reduction, strong reduction and low toxicity Effect

Inactive Publication Date: 2014-04-16
北京纳新天地科技发展有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0004] In the prior art, the graphene oxide is deoxidized to obtain graphene through a reduction method, thereby significantly increasing the conductivity of graphene oxide, but the single layer rate is low, the reduction is not complete, and the ratio of carbon to oxygen in graphene is small. Poor electrical properties greatly affect the wide application of graphene
The original graphene solution preparation method based on hydrobromic acid reduction can not fully disperse the graphite suspension obtained after fully reacting with potassium permanganate. Although the obtained graphene aqueous solution can be used for various industrial purposes, it cannot Guaranteed more than 98%, prepared single-layer graphene aqueous solution

Method used

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Weigh 10g of natural graphite powder, put it in a 1000ml reaction bottle, add 1g of calcium nitrate and 5g of potassium nitrate to it, stir well, slowly add 120g of deionized water into the reaction bottle, and control the system temperature to 2 ±1°C, slowly add 2 g of concentrated sulfuric acid with a mass concentration of 98% to the reaction bottle at a constant temperature, control the system temperature not to exceed 15°C, continue stirring, and slowly add 0.2g of high manganese when the system temperature drops to 10°C Potassium oxide, stirring constantly, control the reaction temperature not to exceed 15°C, after 1 hour of reaction, a graphite oxide solution will be obtained.

[0026] (2) Suction filter the graphite oxide solution, wash the filter cake 3 times with dilute hydrochloric acid with a mass concentration of 2% at 30°C, and then wash 4 times with deionized water to obtain a graphite oxide filter cake; configure 100ml, 25g / L graphite oxide aqueous s...

Embodiment 2

[0029] (1) Weigh 10g of natural graphite powder, put it in a 1000ml reaction bottle, add 1g of calcium nitrate and 4g of potassium nitrate to it, stir well, slowly add 100g of deionized water into the reaction bottle, and control the temperature of the system to 2 ±1°C, slowly add 0.5g of concentrated sulfuric acid with a mass concentration of 98% to the reaction bottle at a constant temperature, control the system temperature not to exceed 15°C, continue stirring, and slowly add 0.05g of high manganese when the system temperature drops to 10°C Potassium oxide, stirring constantly, control the reaction temperature not to exceed 15°C, after 1 hour of reaction, a graphite oxide solution will be obtained.

[0030] (2) Suction filter the graphite oxide solution, wash the filter cake 3 times with dilute hydrochloric acid with a mass concentration of 2% at 31°C, and then wash 4 times with deionized water to obtain a graphite oxide filter cake; configure 100ml, 25g / l Graphite oxide ...

Embodiment 3

[0033] (1) Weigh 10g of natural graphite powder, put it in a 100ml reaction bottle, add 2g of calcium nitrate and 4g of potassium nitrate to it, stir well, slowly add 200g of deionized water into the reaction bottle, and control the system temperature to 2 ±1°C, slowly add 1g of concentrated sulfuric acid with a mass concentration of 98% to the reaction bottle at a constant temperature, control the system temperature not to exceed 15°C, continue stirring, and slowly add 2g of potassium permanganate when the system temperature drops to 10°C , keep stirring, and control the reaction temperature not to exceed 15°C, and a graphite oxide solution will be obtained after 1 hour of reaction.

[0034] (2) Suction filter the graphite oxide solution, wash the filter cake 3 times with dilute hydrochloric acid with a mass concentration of 2% at 30°C, and then wash 4 times with deionized water to obtain a graphite oxide filter cake; configure 100ml, 25g / l Graphite oxide aqueous solution, p...

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Abstract

The invention discloses a preparation method of an aqueous single-layer graphene solution. According to the method, natural graphite, calcium nitrate, potassium nitrate, concentrated sulfuric acid and potassium permanganate are mixed and processed to obtain a graphite oxide solution, and after the graphite oxide solution is prepared into an aqueous single-layer graphene oxide solution, a reducing agent is added for a reaction, and the aqueous single-layer graphene solution is obtained. According to the method, the aqueous single-layer graphene solution with high single layer rate, strong compositing feature and uniform dispersion is prepared finally after multiple times of ultrasonic stripping.

Description

technical field [0001] The invention relates to the technical field of graphene, in particular to a method for preparing a single-layer graphene aqueous solution. Background technique [0002] Graphene is a two-dimensional planar material consisting of carbon atoms according to sp 2 Bonding to form a stable honeycomb structure, with a stable two-dimensional lattice structure and excellent electrical, thermal, mechanical and other properties, in the next generation of integrated circuits, energy storage materials, flexible display materials, biopharmaceuticals, aerospace, environmental protection materials , heat-conducting materials, high-strength steel and many other fields have broad application prospects, and are strategic new materials that influence and lead a new round of industrial revolution. Therefore, it is urgent to seek a method for preparing graphene in large quantities. [0003] The prior art discloses a variety of graphene preparation methods, including grap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/19
Inventor 王云峰李晓斐
Owner 北京纳新天地科技发展有限公司
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