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Graphene aerogel as well as preparation method and application thereof

A graphene aerogel and graphene technology, applied in the field of graphene aerogel and its preparation, can solve the problems of complex process and high temperature, and achieve the effects of simple operation, high utilization rate and low cost

Active Publication Date: 2014-12-31
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a graphene airgel and its preparation method and application in order to overcome the defects of high temperature and complicated process in the preparation method of graphene airgel in the prior art

Method used

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  • Graphene aerogel as well as preparation method and application thereof
  • Graphene aerogel as well as preparation method and application thereof
  • Graphene aerogel as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Utilize the improved oxidative exfoliation graphite method to prepare graphene oxide dispersion liquid:

[0037] Add 10g of graphite, 150ml of 98% sulfuric acid, and 30ml of nitric acid into a 500ml Erlenmeyer flask and stir at room temperature for 24 hours, slowly pour it into 1L of water to collect the solid, wash it 3 times, and dry it at 80°C for 4 hours. Repeat the pre-oxidation process twice. The dried pre-oxidized graphite was put into a box furnace and thermally expanded at 900°C for 10s to obtain thermally expanded graphite oxide. In a 500ml wide-mouth Erlenmeyer flask, mix 5g of heat-expandable graphite oxide with 300ml of sulfuric acid, 5g of K 2 S 2 o 8 , 7g of phosphorus pentoxide mixed and heated at 80°C for 4 hours, diluted with 2L of water,

[0038] Filter and wash, and dry in air for 3 days to obtain pre-oxidized heat-expandable graphite. Mix dry pre-oxidized heat-expandable graphite with 200ml of sulfuric acid at a low temperature of 0-5°C, ad...

Embodiment 2

[0044] Repeat Example 1, except for the following differences, other conditions are the same:

[0045] Step (1) Preoxidized graphite is thermally expanded at 400°C for 30s to obtain thermally expanded graphite oxide;

[0046] Step (4) irradiate the sealed irradiation reactor with a cobalt 60 gamma ray source with a dose of 50kGy, form an amino-modified graphene hydrogel in a thin tubular reactor, and dry it with supercritical carbon dioxide to obtain a slender rod-shaped graphene gas. gel. Its nitrogen content, carbon-oxygen ratio and density are shown in Table 1. The resulting slender rod-shaped graphene airgel is placed into a photo of the character "King" as shown in image 3 shown. The rod-shaped graphene airgel has good oil absorption performance, and the adsorption capacity reaches 110g / g (taking n-decane as an example).

Embodiment 3

[0048] Repeat Example 1, except that there are following differences, other conditions are all the same: step (4) irradiates the sealed irradiation reactor with a cobalt 60 gamma ray source, and the dose is 5kGy to form amino-modified graphite in the cylindrical reactor Alkene hydrogel. Its nitrogen content, carbon-oxygen ratio and density are shown in Table 1. The photo of the graphene airgel obtained is similar to Example 1. The cylindrical graphene airgel has good oil absorption performance, and the adsorption capacity reaches 112g / g (taking n-decane as an example).

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Abstract

The invention discloses graphene aerogel and a preparation method thereof. The method comprises the following steps: (1) uniformly mixing graphene oxide dispersion liquid with an amine water-soluble compound to obtain graphene oxide mixed liquid, wherein the amine water-soluble compound is selected from one or more of diethylamine, ethidene diamine, propane diamine, butane diamine, diethylene triamine, triethylene tetramine, tetraethylene pentamine, allylamine polymer and N,N'-bis(2-aminoethyl)-1,3-propane diamine; (2) irradiating the graphene oxide mixed liquid by high-energy rays under the anaerobic condition to obtain amino-modified graphene aerogel; (3) performing freeze-drying or supercritical CO2 drying to obtain the graphene aerogel. The graphene aerogel adopts a porous and macroporous structure, is relatively uniform in structure, and can be used for adsorbing an organic solvent; moreover, the preparation method is simple and environment-friendly.

Description

technical field [0001] The invention relates to a graphene airgel and its preparation method and application. Background technique [0002] Graphene (Graphene) has a real monoatomic layer thickness and a strict two-dimensional structure. It has high mechanical strength, elasticity, thermal conductivity, electrical conductivity, and quantum Hall effect. It has attracted academia and industry in recent years. widespread attention in the world. Since the discovery of graphene by British scientists Andre Gem and Costiano Voseno in 2010 and won the Nobel Prize, graphene research has reached an unprecedented research climax, and more and more studies have found that its role in energy storage , electrical devices, catalysis and special fields of environmental science have great application prospects. [0003] From the perspective of practical application, it is undoubtedly a very valuable research direction to transform nanographene materials into macrostructure materials. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 李景烨李吉豪张伯武李林繁
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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