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Graphene hydrogel, graphene aerogel as well as preparation method and application thereof

A technology of graphene hydrogel and graphene airgel, which is applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., and can solve the application of amine-based nitrogen impurity atoms and amine-type reducing agents High cost, washing and discharge of nitrogen-containing amine reaction by-products, etc., to achieve low cost, avoid chemical reaction and purification process, and high utilization rate

Active Publication Date: 2016-10-19
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the introduction of amine-based nitrogen impurity atoms in the preparation method of graphene airgel by the existing irradiation technology, the high application cost of amine reducing agents, and the post-treatment process will also involve nitrogen-containing amines. Disadvantages such as washing and discharging of similar reaction by-products provide a graphene hydrogel, graphene aerogel, preparation method and application thereof

Method used

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  • Graphene hydrogel, graphene aerogel as well as preparation method and application thereof
  • Graphene hydrogel, graphene aerogel as well as preparation method and application thereof
  • Graphene hydrogel, graphene aerogel as well as preparation method and application thereof

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Embodiment 1

[0039] (1) ①Preparation of graphene oxide dispersion by improved oxidized exfoliated graphite method:

[0040] 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 potassium persulfate (K 2 S 2 o 8 ), 7g of phosphorus pentoxide mixed and heated at 80°C for 4 hours, diluted with 2L of water, filtered and washed, dried in air for 3 days to obtain pre-oxidized thermally expandable graphite. Mix dry pre-oxidized heat-expandable graphite with 200ml of sulfuric acid at a low temperature of 0-...

Embodiment 2

[0045] According to the preparation method of Example 1, except for the following differences, other conditions are the same: the graphene oxide dispersion prepared in step (1) is mixed with ethanol to prepare a 4mg / ml graphene oxide mixed solution, wherein ethanol The mass percent of the mass of the graphene oxide mixed solution is 20%; step (2) irradiates the irradiation reactor without sealing (air atmosphere) with a cobalt 60 gamma ray source, and the irradiation dose is 110kGy, and the irradiation dose rate is 0.5 kGy / hour, a graphene hydrogel is formed in a thin tubular reactor, and is dried by supercritical carbon dioxide to obtain a slender rod-shaped graphene aerogel.

Embodiment 3

[0047] Carry out according to the preparation method of embodiment 1, except that there are following differences, other conditions are all the same: the graphene oxide dispersion liquid that step (1) is made is mixed with methyl alcohol, Virahol, butanol, polyvinyl alcohol (wherein The mass percent of methanol, isopropanol and butanol accounts for the mass percent of graphene oxide mixed solution is 10%, the mass percent of polyvinyl alcohol accounts for the mass percent of graphene oxide mixed solution is 1%) to prepare 8mg / ml graphene oxide mixed solution Solution; Step (2) irradiates the irradiation reactor with cobalt 60 gamma ray source with argon deoxygenation sealing, and the irradiation dose is 600kGy, and the irradiation dose rate is 12kGy / hour, and forms graphene in the cylindrical reactor Hydrogels.

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Abstract

The invention discloses graphene hydrogel, graphene aerogel as well as a preparation method and an application thereof. The preparation method of the graphene hydrogel comprises the following steps: (1) dispersion liquid of graphene oxide and water-soluble alcohol are uniformly mixed in order to obtain mixed liquor of graphene oxide; wherein mass content of the water-soluble alcohol in the mixed liquor of graphene oxide is 2-95%, that is the mass of the water-soluble alcohol accounts for 2-95% of the total mass of the mixed liquor of graphene oxide; (2) an irradiation reaction is carried out with high energy ray irradiation for the mixed liquor of graphene oxide. The graphene aerogel is obtained by freeze drying or supercritical carbon dioxide drying of the graphene hydrogel. The preparation method has the advantages of simple operation, green and environmental protection, easy reaction conditions, and operation both in anoxic and aerobic atmosphere; the graphene aerogel has high purity, and except carbon and oxygen elements, the aerogel does not have impurity atoms; the aerogel has a porous and uniform structure, and is good for adsorption of organic solvents with a good oil absorption property.

Description

technical field [0001] The invention relates to a graphene hydrogel, a graphene airgel and a preparation method and application thereof. 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 macr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B01J20/20B01J20/28B01J20/30
Inventor 李吉豪李景烨李林繁张阔贾娜
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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