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Hydrophobic graphene aerogel and preparation method and application thereof

A graphene aerogel, graphene hydrogel technology, applied in aerogel preparation, graphene, separation methods and other directions, can solve problems such as low hydrophobicity, improve hydrophobic performance, reduce preparation cost, reduce energy consumption effect

Active Publication Date: 2019-08-23
ZHONGSU NEW TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphene airgel obtained by this method has high resilience, but its hydrophobicity is not high

Method used

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

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preparation example Construction

[0027] The preparation method of the hydrophobic graphene airgel of the present invention comprises: a preparation step and a soaking step of the graphene airgel. A detailed description is given below.

[0028]

[0029] The preparation step of graphene airgel comprises: (1) the step of preparing graphene oxide dispersion; (2) the step of preparing foam; (3) the step of preparing graphene hydrogel; (4) washing graphene water The step of gelling; (5) the step of freezing and drying under normal pressure.

[0030] In step (1), the graphene oxide and the reducing agent are added into water to disperse uniformly to obtain a graphene oxide dispersion. In order to disperse the graphene oxide in water more fully, ultrasonic dispersion can be used for 10-30 minutes. The graphene oxide sheet diameter may be 5-40 μm; preferably, the graphene oxide sheet diameter is 10-35 μm; more preferably, the graphene oxide sheet diameter is 20-45 μm. Using the graphene oxide with the above sheet...

Embodiment 1

[0056] (1) Add 480 mg of ascorbic acid and 240 mg of graphene oxide into 60 ml of water, disperse evenly by ultrasonic oscillation for 15 minutes, and obtain a graphene oxide dispersion liquid with a graphene oxide concentration of 4 mg / ml.

[0057] (2) Add 3 ml of sodium dodecylbenzenesulfonate aqueous solution with a concentration of 50 mg / ml into the graphene oxide dispersion, and stir at a speed of 10000 rpm to obtain a foam.

[0058] (3) Put the foam at 80° C. for 6 hours of reduction reaction, and then cool it down to 25° C. to obtain graphene hydrogel.

[0059] (4) immerse and wash the graphene hydrogel with 1 vol% ethanol aqueous solution for 24 hours to obtain the graphene hydrogel after washing.

[0060] (5) Take the washed graphene hydrogel out and freeze it at -45°C, then take it out and heat it up to 25°C to melt, and then dry it under normal pressure to obtain the graphene aerogel.

[0061] (6) Soak the graphene airgel in a mixed solution containing ammonia wate...

Embodiment 2

[0063] (1) Add 480 mg of ascorbic acid and 300 mg of graphene oxide into 60 ml of water, disperse evenly by ultrasonic oscillation for 15 minutes, and obtain a graphene oxide dispersion liquid with a graphene oxide concentration of 5 mg / ml.

[0064] (2) Add 3 ml of sodium dodecylbenzenesulfonate aqueous solution with a concentration of 50 mg / ml into the graphene oxide dispersion, and stir at a speed of 10000 rpm to obtain a foam.

[0065] (3) Put the foam at 80° C. for 6 hours of reduction reaction, and then cool it down to 25° C. to obtain graphene hydrogel.

[0066] (4) immerse and wash the graphene hydrogel with 1 vol% ethanol aqueous solution for 24 hours to obtain the graphene hydrogel after washing.

[0067] (5) Take the washed graphene hydrogel out and freeze it at -45°C, then take it out and heat it up to 25°C to melt, and then dry it under normal pressure to obtain the graphene aerogel.

[0068] (6) Put the graphene airgel in a mixed solution containing ammonia and e...

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Abstract

The invention discloses hydrophobic graphene aerogel and a preparation method and application thereof. The method includes the step of soaking graphene aerogel in a mixed solution containing ammonia water and ethanol. The hydrophobic graphene aerogel can be obtained.

Description

technical field [0001] The invention relates to a hydrophobic graphene airgel and its preparation method and application. Background technique [0002] Graphene airgel not only has the mechanical stability and hydrophobicity of graphene, but also has the characteristics of ultralight and high porosity of aerogel. The six-membered ring structure of graphene airgel and organic compounds are prone to π-π interaction to form a stable complex. Therefore, graphene airgel has high adsorption capacity for oil and organic solvents, and can achieve oil-water separation Purpose. Graphene aerogels have high compression resilience, and can achieve repeated adsorption-desorption processes by extrusion, thereby achieving continuous adsorption of oils and organic solvents. [0003] CN105384165B discloses a preparation method of spongy light graphene airgel, the method is foamed by adding foaming agent in graphene oxide colloidal solution, and then the foam system after foaming is put into...

Claims

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Application Information

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IPC IPC(8): C01B32/184B01J13/00B01D17/022
CPCB01D17/0202B01J13/0091C01B32/184
Inventor 童裳慧
Owner ZHONGSU NEW TECH CO LTD
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