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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Graphene airgel obtained by this method has hig

Method used

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

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Example Embodiment

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

[0028]

[0029] The preparation steps of graphene aerogel include: (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 Gel step; (5) Freezing and atmospheric drying step.

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

Example Embodiment

[0055] Example 1

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

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

[0058] (3) Place the foam at 80°C for a reduction reaction for 6 hours, and then naturally cool to 25°C to obtain a graphene hydrogel.

[0059] (4) The graphene hydrogel is immersed and washed with a 1 vol% ethanol aqueous solution for 24 hours to obtain a washed graphene hydrogel.

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

[0061] (6) Soak the graphene aerogel in a mixed solution of ammonia...

Example Embodiment

[0062] Example 2

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

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

[0065] (3) The foam is placed at 80°C for a reduction reaction for 6 hours, and then naturally cooled to 25°C to obtain a graphene hydrogel.

[0066] (4) The graphene hydrogel is immersed and washed with a 1 vol% ethanol aqueous solution for 24 hours to obtain a washed graphene hydrogel.

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

[0068] (6) Put the graphene aerogel in a mixed solution conta...

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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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