Method for preparing few-layer graphite nanosheets through supersonic supercritical CO2-shear coupled tripping of expanded graphite

A technology of graphite nanosheets and expanded graphite, which is applied to single-layer graphene, chemical instruments and methods, graphene, etc., can solve the problems of high price, waste of resources, and large environmental impact, and achieve good peeling quality and high-efficiency peeling Effect

Pending Publication Date: 2018-08-24
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The graphene obtained by this method may have the possibility of graphene oxide, and the added oxidant also has a great impact on the environment, and causes waste of resources, and is expensive and not suitable for mass production.

Method used

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  • Method for preparing few-layer graphite nanosheets through supersonic supercritical CO2-shear coupled tripping of expanded graphite
  • Method for preparing few-layer graphite nanosheets through supersonic supercritical CO2-shear coupled tripping of expanded graphite
  • Method for preparing few-layer graphite nanosheets through supersonic supercritical CO2-shear coupled tripping of expanded graphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Ultrasonic supercritical carbon dioxide-shear coupled exfoliation of expanded graphite to prepare a preparation method for oligolayer graphite nanosheets, the steps are as follows:

[0050] 1) Disperse 9 g of expanded graphite powder in 300 mL of isopropanol aqueous solution, and then add 0.9 g of PVP (polyvinylpyrrolidone, (C 6 h 9 NO )n) and 0.9g melamine (C 3 h 6 N 6 ) after ultrasonic dispersion for 30min to obtain expanded graphite suspension; the isopropanol and H 2 The volume ratio of O is 1:1.

[0051] 2) Under the action of high-energy ultrasound (that is, the ultrasonic power is 600W), the expanded graphite suspension is ultrasonically peeled off for 1 hour to obtain the pretreated suspension;

[0052] 3) Put the pretreated suspension in supercritical carbon dioxide and react in the shearing action, that is, pressurize to 20MPa and heat to 50°C while feeding carbon dioxide into the reactor, and set the temperature at a shear rate of 1000rpm Under the she...

Embodiment 2

[0069] Ultrasonic supercritical carbon dioxide-shear coupled exfoliation of expanded graphite to prepare a preparation method for oligolayer graphite nanosheets, the steps are as follows:

[0070] 1) Disperse 9 g of expanded graphite powder in 300 mL of ethanol aqueous solution, and then add 0.9 g of PVP (polyvinylpyrrolidone, (C 6 h 9 NO) n ) and 0.9g melamine (C 3 h 6 N 6 ) after ultrasonic dispersion for 30min to obtain expanded graphite suspension; the ethanol and H 2 The volume ratio of O is 2:8.

[0071] 2) Under the action of high-energy ultrasound (that is, the ultrasonic power is 600W), the expanded graphite suspension is ultrasonically peeled off for 1 hour to obtain the pretreated suspension;

[0072] 3) Put the pretreated suspension in supercritical carbon dioxide and react in the shearing action, that is, pressurize to 20MPa and heat to 50°C while feeding carbon dioxide into the reactor, and set the temperature at a shear rate of 1000rpm Under the shear act...

Embodiment 3

[0078] The difference from Example 1 is that the temperature in the reactor is 45°C.

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Abstract

The invention relates to a method for preparing few-layer graphite nanosheets through supersonic supercritical CO2-shear coupled stripping of expanded graphite. The method comprises steps as follows:1) expanded graphite micropowder is dispersed in a stripping solvent to form a suspension; 2) a dispersant and a stripping aid are dissolved in the suspension in the step 1) for ultrasonic dispersion;3) the suspension subjected to ultrasonic dispersion is treated under the high-power ultrasonic action; 4) the suspension stripped in the step 3) is subjected to intercalation stripping for a periodof time under the condition of supercritical CO2 shearing; 5) the suspension is treated under the high-power ultrasonic action, and the few-layer graphite nanosheets are obtained. According to the method, the few-layer graphite nanosheets are prepared on a large scale through stripping of the graphite micropowder, the action force produced under the coupling condition is higher, the yield of stripped graphene can be increased, the solvent is a green solvent and is efficient, environmentally friendly and low in cost, and large-scale production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial processing, and specifically relates to a method for preparing oligolayer graphite nanosheets by exfoliating expanded graphite with supercritical carbon dioxide-ultrasonic coupling. Background technique [0002] In recent years, graphene, a two-dimensional layered sheet material, has gradually attracted people's attention. It is a kind of sp 2 A hybrid two-dimensional periodic honeycomb lattice structure composed of carbon six-membered rings. It is well known that graphite has poor electrical conductivity, which limits its large-scale application, while single-layer graphene has excellent electrical conductivity, with a load mobility of about 200,000 cm 2 V -1 the s -1 . In addition, graphene-based nanocomposites are a research boom in recent years, mainly used in supercapacitors (Carbon, 2012, 50, 5481), electrocatalytic hydrogen production (Mater. Chem. A, 2016, 4, 7823), Electrode ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19
CPCC01B2204/02C01B2204/32C01B32/19Y02P20/54
Inventor 陈德良王凯张锐卢红霞许红亮王海龙范冰冰邵刚杨德威王兆武王家豪
Owner ZHENGZHOU UNIV
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