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Elastic graphene aerogel and preparation method and application thereof

A graphene hydrogel and elastic graphite technology, which is applied in the direction of airgel preparation, graphene, separation methods, etc., can solve the problems of poor elasticity and hydrophobicity, low hydrophobicity and adsorption, and increased production costs. To achieve the effect of preventing excessive growth of ice crystals, increasing hydrophobicity and improving elasticity

Active Publication Date: 2019-10-15
城康材料技术有限公司
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Problems solved by technology

The graphene airgel obtained by this method has high resilience, but its hydrophobicity and adsorption are not high
CN108439380A discloses a preparation method of superelasticity and superhydrophobic pure graphene airgel. The method uses graphene oxide as a precursor, and utilizes changing the solution pH and temperature to control the distribution and graphitization of oxygen-containing functional groups on the nanosheets. Structural size, using ice crystals as a template, direct freezing-thawing to obtain a hydrogel with a three-dimensional network structure, in order to form a three-dimensional network structure, a cross-linking agent needs to be introduced, which increases the cost of preparation, and its elasticity and hydrophobic properties are poor

Method used

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  • Elastic graphene aerogel and preparation method and application thereof
  • Elastic graphene aerogel and preparation method and application thereof
  • Elastic graphene aerogel and preparation method and application thereof

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preparation example Construction

[0027]

[0028] The preparation steps of elastic graphene airgel of the present invention comprise: (1) the step of preparing graphene oxide dispersion; (2) the step of preparing mixed solution; (3) the step of preparing graphene hydrogel; (4) Graphene hydrogel soaking step and (4) freezing and normal pressure drying step. A detailed description is given below.

[0029] In step (1), the graphene oxide and the reducing agent are dispersed in water to obtain a graphene oxide dispersion. The graphene oxide of the present invention may be graphene oxide prepared by the improved Hummers method, but is not limited to graphene oxide prepared by the improved Hummers method. Graphene oxide prepared by liquid phase method, mechanical method, electrochemical oxidation method and other methods can be used in the preparation method of the present invention.

[0030] In order to disperse the graphene oxide in water more fully, it can be treated with ultrasonic vibration for 8-35 minutes...

Embodiment 1

[0049] (1) Add 900 mg of ascorbic acid and 360 mg of graphene oxide into 60 ml of water, and ultrasonically vibrate for 10 minutes to obtain a graphene oxide dispersion (the concentration of graphene oxide is 6 mg / ml).

[0050] (2) Add 3 ml of an aqueous sodium dodecylbenzenesulfonate solution with a concentration of 50 mg / ml into the graphene oxide dispersion, and stir at a rotational speed of 10000 rpm to obtain a mixed solution.

[0051] (3) The mixture was reacted at 80° C. for 6 h, and then naturally cooled to 25° C. to obtain graphene hydrogel.

[0052] (4) Soak and wash the graphene hydrogel with 1vol% ethanol aqueous solution for 24 hours, and then soak it in 14vol% ammonia solution for 5 hours at a soaking temperature of 25° C. to obtain the soaked graphene hydrogel.

[0053] (5) The soaked graphene hydrogel was frozen at -45°C, then heated to 25°C to melt, and then dried at normal pressure and 65°C to obtain elastic graphene aerogels.

Embodiment 2

[0055] (1) Add 900 mg of ascorbic acid and 240 mg of graphene oxide into 60 ml of water, and ultrasonically vibrate for 10 minutes to obtain a graphene oxide dispersion (graphene oxide concentration is 4 mg / ml).

[0056] (2) Add 3 ml of an aqueous sodium dodecylbenzenesulfonate solution with a concentration of 50 mg / ml into the graphene oxide dispersion, and stir at a rotational speed of 10000 rpm to obtain a mixed solution.

[0057] (3) The mixture was reacted at 80° C. for 6 h, and then naturally cooled to 25° C. to obtain graphene hydrogel.

[0058] (4) Soak and wash the graphene hydrogel with 1vol% ethanol aqueous solution for 24 hours, and then soak it in 14vol% ammonia solution for 5 hours at a soaking temperature of 25° C. to obtain the soaked graphene hydrogel.

[0059] (5) The soaked graphene hydrogel was frozen at -45°C, then heated to 25°C to melt, and then dried at normal pressure and 65°C to obtain elastic graphene aerogels.

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Abstract

The invention discloses an elastic graphene aerogel and a preparation method and application thereof. The preparation method comprises the following steps: (1) dispersing graphene oxide and a reducingagent in water to obtain a graphene oxide dispersion liquid; (2) mixing a foaming agent and the graphene oxide dispersion liquid, and foaming to obtain a mixed liquid; (3) reacting the mixed solutionat 70-90 DEG C for 2-12h, and then cooling to 15-35 DEG C to obtain graphene hydrogel; (4) soaking the graphene hydrogel in an ammonia water solution to obtain the soaked graphene hydrogel; (5) freezing the soaked graphene hydrogel at-55 to-10 DEG C, then raising the temperature to 15 to 35 DEG C, and drying at normal pressure to obtain the elastic graphene aerogel. The method can obtain the elastic graphene aerogel with higher mechanical performance and adsorption performance.

Description

technical field [0001] The invention relates to an elastic graphene airgel and its preparation method and application. Background technique [0002] Graphene airgel is a three-dimensional airgel assembled from two-dimensional graphene, which not only retains the excellent properties of graphene, but also contains many micropores, mesopores and macropores in its three-dimensional structure. The structure provides graphene aerogels with a large specific surface area and high porosity, and also reduces the density of graphene aerogels. Three-dimensional graphene airgel has excellent adsorption properties for oil substances, can achieve adsorption-desorption only by extrusion, and is easy to recycle, so it is a promising adsorption material. The preparation methods of graphene airgel mainly include freeze-drying and supercritical drying, which are complicated in process and high in cost, making it difficult to produce them on a large scale. [0003] CN106517160B discloses a ki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00B01J20/20B01J20/28B01J20/30C01B32/184C02F1/28C02F1/40B01D17/022
CPCB01D17/0202B01J13/0091B01J20/20B01J20/28047B01J2220/4806B01J2220/4812C02F1/283C02F1/40C01B32/184
Inventor 童裳慧
Owner 城康材料技术有限公司
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