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Preparation method of super-hydrophobic graphene aerogel

A technology of graphene airgel and graphene hydrogel, which is applied in the direction of graphene, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve problems such as large-scale difficulties and limitations, and achieve low cost Low cost, easy operation, wide application prospects

Inactive Publication Date: 2017-05-31
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of extrudable, ultra-thin graphene oil-absorbing material with low cost, simple synthesis method and easy large-scale production in order to solve the technical problem that the large-scale production of the existing novel graphene oil-absorbing material is very difficult and limits its practical application. Preparation method of hydrophobic graphene airgel material

Method used

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  • Preparation method of super-hydrophobic graphene aerogel
  • Preparation method of super-hydrophobic graphene aerogel
  • Preparation method of super-hydrophobic graphene aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] a. Disperse graphene oxide in deionized water, and ultrasonically disperse to form a graphene oxide aqueous solution with a uniform concentration of 2 mg / mL;

[0021] b. Add a reducing agent of 1 mg / mL ascorbic acid to the graphene oxide solution obtained in step a, stir evenly with a magnetic force, then pour it into a container and seal it, then heat it in an oven at a temperature of 60°C and a holding time of 2 hours to obtain Graphene hydrogel;

[0022] c. After immersing and cleaning the graphene hydrogel obtained in step b with deionized water, perform directional freezing at a temperature of -196° C. to obtain a frozen sample, and then freeze-dry to obtain a freeze-dried sample;

[0023] d. Put the freeze-dried sample into an airtight container containing a long carbon chain alkoxysilane material-ethanol solution with a carbon chain length of 6 carbon atoms at a concentration of 1 wt%, react at a temperature of 50°C for 24 hours, and dry Then the superhydrophobi...

Embodiment 2

[0025] a. Disperse graphene oxide in deionized water, and ultrasonically disperse to form a graphene oxide aqueous solution with a uniform concentration of 4 mg / mL;

[0026] b. Add 0.5 mg / mL of dopamine and 4 mg / mL of ascorbic acid as the reducing agent to the graphene oxide solution obtained in step a, stir evenly with a magnetic force, then pour it into a container and seal it, heat it in an oven at a temperature of 70°C, and keep it warm The time is 6 hours, and the graphene hydrogel is obtained;

[0027] c. After immersing and cleaning the graphene hydrogel obtained in step b with deionized water, perform directional freezing at a temperature of -196° C. to obtain a frozen sample, and then freeze-dry to obtain a freeze-dried sample;

[0028] d. Put the freeze-dried sample into an airtight container containing a fluorinated long carbon chain alkoxysilane material-ethanol solution with a carbon chain length of 12 carbon atoms at a concentration of 2 wt%, and react at a tempe...

Embodiment 3

[0030] a, disperse graphene oxide in deionized water, and ultrasonically disperse to form a graphene oxide aqueous solution with a uniform concentration of 6 mg / mL;

[0031] b. Add 1 mg / mL of dopamine and 8 mg / mL of ascorbic acid as the reducing agent to the graphene oxide solution obtained in step a, stir evenly with a magnetic force, then pour it into a container and seal it, then heat it in an oven at a temperature of 80°C for a holding time For 8 hours, the graphene hydrogel was obtained;

[0032] c. After immersing and cleaning the graphene hydrogel obtained in step b with deionized water, perform directional freezing at a temperature of -196° C. to obtain a frozen sample, and then freeze-dry to obtain a freeze-dried sample;

[0033] d. Put the freeze-dried sample into an airtight container containing a long carbon chain alkoxysilane material-ethanol solution with a carbon chain length of 18 carbon atoms at a concentration of 3 wt%, react at a temperature of 70°C for 8 ho...

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Abstract

The invention relates to a preparation method of super-hydrophobic graphene aerogel. The method comprises the steps of adding a reducing agent to a graphene oxide solution, reducing graphene oxide through atmospheric heating and self-assembling a three-dimensional graphene aerogel structure; obtaining a graphene aerogel material by using a directed freeze drying method; and carrying out modification by using long carbon-chain alkoxy silane or fluoro long carbon-chain alkoxy silane to obtain a super-hydrophobic graphene aerogel material. The extrusion-resistant and super-hydrophobic graphene aerogel material is prepared by adopting a simple, efficient, economical and environment-friendly synthesis method; and the preparation method is a novel method for preparing the graphene aerogel material on a large scale. The super-hydrophobic graphene aerogel material obtained through the method has the advantages of being low in density, excellent in mechanical property, good in heat stability, high in oil absorption rate and good in cycling stability, is a novel efficient oil-water separation material, and has good application value and a wide market prospect.

Description

technical field [0001] The invention relates to a preparation method of graphene airgel, in particular to a preparation method of superhydrophobic graphene airgel, and belongs to the field of functional materials. Background technique [0002] With the development of modern industry, frequent oil and various organic solvent leakage accidents have a catastrophic impact on the environment. In addition, petroleum and most organic solvents are flammable, which bring safety hazards such as fire and explosion, and pose a huge threat to the environment and the safety of human life and property. Therefore, oil-absorbing (organic matter) materials are the most important for protecting the environment and maintaining water quality. Although traditional natural oil-absorbing materials are low in cost, they suffer from poor adsorption rate and low adsorption selectivity. Although artificially synthesized polymer materials have improved the adsorption selectivity, the adsorption rate i...

Claims

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Application Information

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IPC IPC(8): C01B32/198B01J20/20B01J20/28B01J20/30
CPCB01J20/20B01J20/28047C01B2204/20C01P2006/90
Inventor 杨苏东马鹏程胡美龙
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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