Three-dimensional network graphene airgel, its preparation method and application

A graphene airgel and three-dimensional network technology, applied in the direction of airgel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problem of less attention to solid-phase carbon sources, achieve excellent adsorption and catalytic performance, Enrich the pore structure and specific surface area, the effect of controllable shape

Active Publication Date: 2021-01-29
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the traditional chemical vapor deposition methods use gas-phase carbon sources, and less attention has been paid to solid-phase carbon sources, and there have been no reports on the use of organic carbon sources complexed with metal elements to prepare graphene.

Method used

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  • Three-dimensional network graphene airgel, its preparation method and application
  • Three-dimensional network graphene airgel, its preparation method and application

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preparation example Construction

[0018] Specifically, the invention discloses a preparation method of a three-dimensional network graphene airgel, comprising the following steps:

[0019] (1) dissolving the polymer and the transition metal salt in water to obtain a mixed solution;

[0020] (2) Sealing and heating the solution obtained in step (1);

[0021] (3) The product obtained in step (2) is first mixed with the polysaccharide solution, then repeatedly thawed, and then mixed with the transition metal salt solution to form a gel;

[0022] (4) Calcining the gel product obtained in step (3) at a high temperature under a protective atmosphere and metal substrate catalysis, to obtain the three-dimensional network graphene airgel.

[0023] Wherein, the polymer in step (1) can be all aliphatic alcohols such as polyvinyl alcohol and polyethylene glycol, proteins such as gelatin and silk fibroin, and sugars such as agar.

[0024] Wherein, the transition metal salt in step (1) is, for example, salts of all transi...

Embodiment 1

[0038] In this embodiment, the three-dimensional network graphene airgel is prepared by the following specific steps:

[0039] Prepare a mixed solution of polyvinyl alcohol and ferric sulfite, wherein the concentration of polyvinyl alcohol in the final solution is 10 mg / mL, and the concentration of ferric sulfite in the final solution is 0.1 mol / L, and stir to form a uniform solution. Put the mixed solution into a polytetrafluoroethylene-lined stainless steel reaction kettle and heat it at 120°C for 12 hours. After the reaction, dissolve sodium alginate into the product solution. The concentration of sodium alginate is 40 mg / mL, and stir to form a uniform solution. Add the solution dropwise into 100mL 30mg / mL ferric sulfite solution to cross-link sodium alginate and iron ions to form gel balls, freeze the gel balls at -40°C for 12h, then thaw at room temperature for 12h, repeat Cold thaw 3 times to allow polyvinyl alcohol to form a gel. The double network gel was freeze-dried...

Embodiment 2

[0041] Prepare a mixed solution of polyvinyl alcohol and copper nitrate, wherein the concentration of polyvinyl alcohol in the final solution is 10mg / mL, and the concentration of copper nitrate in the final solution is 0.1mol / L, and stir to form a uniform solution. Put the mixed solution into a polytetrafluoroethylene-lined stainless steel reaction kettle and heat it at 200°C for 24 hours. After the reaction, dissolve sodium carboxymethylcellulose in the product solution. The concentration of sodium carboxymethylcellulose is 80 mg / mL. Stir to form a homogeneous solution, drop this solution into 100mL 30mg / mL copper nitrate solution drop by drop, make sodium carboxymethylcellulose cross-link with copper ions to form gel balls, freeze the gel balls at -40°C for 12h , then thawed at room temperature for 12 hours, and repeated freezing and thawing three times to make the polyvinyl alcohol form a gel. The double network gel was freeze-dried to form an aerogel, and the aerogel was ...

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Abstract

A three-dimensional network graphene airgel, its preparation method and application thereof, the preparation method comprising: (1) dissolving a polymer and a transition metal salt in water to obtain a mixed solution; (2) sealing and heating the solution; (3) The above product is mixed with polysaccharide solution first, then repeatedly thawed, and then mixed with transition metal salt solution to form a gel; (4) The above product is calcined at a high temperature under a protective atmosphere and a metal substrate to obtain a three-dimensional network Graphene airgel. Compared with flake graphene, the three-dimensional network graphene airgel obtained by the present invention has a richer pore structure and specific surface area, excellent adsorption and catalytic performance, controllable shape, high yield, and broad application in the fields of environment and energy. application prospects.

Description

technical field [0001] The invention belongs to the research field of environmental functional materials, and specifically relates to a graphene airgel and a preparation method thereof, in particular to a three-dimensional network graphene airgel, a preparation method and an application thereof. Background technique [0002] Graphene is a carbon atom with sp 2 The hexagonal honeycomb arrangement formed by hybridization and carbon nanomaterials with atomic layer thickness have been widely used in the fields of environment and energy due to their high specific surface area and excellent electrical properties. Chemical vapor deposition has attracted extensive attention for its ability to synthesize high-quality graphene. However, most of the traditional chemical vapor deposition methods use gas-phase carbon sources, and less attention has been paid to solid-phase carbon sources, and there have been no reports on the use of organic carbon sources complexed with metal elements t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01J23/72B01J23/745B01J13/00C02F1/28C02F1/72C02F101/38C02F101/34
CPCB01J13/0091B01J20/0222B01J20/0225B01J20/0229B01J20/0233B01J20/0237B01J20/0281B01J20/0296B01J20/20B01J20/28047B01J23/72B01J23/745C02F1/281C02F1/283C02F1/722C02F1/725C02F2101/34C02F2101/38C02F2305/026
Inventor 庄媛石宝友王雪纯
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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