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Preparation method and application of hydrophobic graphene aerogel

A technology of graphene airgel and graphene hydrogel, which is applied in the direction of airgel preparation, graphene, separation methods, etc., can solve the problems of poor structural strength and high preparation cost, and achieve the effect of small steric hindrance and synthesis The effect of short time and clear synthesis process

Active Publication Date: 2020-11-27
SHANXI DATONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of high preparation cost and poor structural strength of hydrophobic graphene airgel materials, the present invention provides a method for preparing hydrophobic graphene airgel and its application

Method used

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  • Preparation method and application of hydrophobic graphene aerogel
  • Preparation method and application of hydrophobic graphene aerogel
  • Preparation method and application of hydrophobic graphene aerogel

Examples

Experimental program
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Effect test

Embodiment 1

[0044] At room temperature, mix 60 mL of graphene oxide with a concentration of 12 mg / mL (based on graphite content), 20 mL of ethanol, deionized water, and 0.5 g of water-soluble starch to a total volume of 90 mL, stir for 10 minutes, and sonicate for 30 minutes to obtain a uniform mixed dispersion; adjust the pH of the mixed dispersion to 8, transfer it to a hydrothermal reaction kettle, place it at 130°C for 3 hours, cool to room temperature, and obtain a graphene hydrogel; add 25mL ethanol-trimethylchlorosilane mixed solution (V 乙醇 :V 三甲基氯硅烷 =2:3) Submerge the graphene hydrogel completely, place the hydrogel on a circular shaker at a speed of 150rpm and mix for 3 hours to obtain a graphene hydrogel uniformly infiltrated with a silane coupling agent; Continue the reaction at 80°C for 2 hours to obtain a hydrophobically modified graphene hydrogel; dry the modified graphene hydrogel at 40°C under normal pressure for 10 hours to obtain a graphene airgel; The gel was heated i...

Embodiment 2

[0046] At room temperature, 72 mL of graphene oxide with a concentration of 10 mg / mL (based on graphite content), deionized water, 10 mL of tetrahydrofuran, and 0.5 g of lactose powder were mixed to a total volume of 90 mL, stirred for 5 minutes, and ultrasonically treated for 30 minutes to obtain Uniform mixed dispersion; adjust the pH of the mixed dispersion to 9, transfer it to a hydrothermal reactor, place it at 130°C for 3 hours, cool to room temperature, and obtain a graphene hydrogel; add 20mL of ethanol-cyclohexylmethyl Dimethoxysilane mixed solution (V 乙醇 :V 环己基甲基二甲氧基硅烷 =3:1) Submerge the graphene hydrogel completely, place the hydrogel on a circular shaker at a speed of 200rpm and mix for 3 hours to obtain a graphene hydrogel uniformly infiltrated with the silane coupling agent; Continue to react at 80°C for 2 hours to obtain a hydrophobically modified graphene hydrogel; dry the modified graphene hydrogel at 60°C for 10 hours in vacuum, and continue to heat it under...

Embodiment 3

[0048] At room temperature, mix 60 mL of graphene oxide with a concentration of 12 mg / mL (based on graphite content), deionized water, 20 mL of ethanol, and 0.5 g of egg white protein powder to a total volume of 90 mL, stir for 10 minutes, and sonicate for 30 minutes to obtain Uniform mixed dispersion; adjust the pH of the mixed dispersion to 8, transfer it to a hydrothermal reaction kettle, place it at 140°C for 3 hours, cool to room temperature, and obtain a graphene hydrogel; add 15mL of ethanol-cyclohexylmethyl Dimethoxysilane mixed solution (V 乙醇 :V 环己基甲基二甲氧基硅烷 =2:1) ​​Submerge the graphene hydrogel completely, place the hydrogel on a circular shaker at a speed of 200rpm and mix for 6 hours to obtain a graphene hydrogel uniformly infiltrated with a silane coupling agent; Continue to react at 80°C for 2 hours to obtain a graphene hydrogel hydrophobically modified by a silane coupling agent; dry the modified graphene hydrogel at 60°C under normal pressure for 8 hours, and ...

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Abstract

The invention discloses a preparation method and application of hydrophobic graphene aerogel. The invention belongs to the field of graphene aerogel. The problems that an existing hydrophobic grapheneaerogel material is high in preparation cost, poor in structural strength and the like can be solved. A hydrothermal reaction method is adopted, a saccharide cross-linking agent which is low in priceand easy to obtain is adopted, an organic auxiliary agent and efficient and cheap modifiers such as trimethylchlorosilane are added, and the hydrophobic and oleophylic graphene aerogel material is obtained through a normal-pressure drying method and a microwave annealing method. It can be seen through scanning electron microscope imaging that the material is structurally a thin-wall porous material formed by three-dimensional crosslinking of thin-layer graphene. The material is definite in synthesis process, short in synthesis time, low in cost, free of heavy metal and organic pollutants, high in structural strength and capable of bearing the heavy pressure which is more than one hundred times of the mass of the material. The material has super-hydrophobicity, and the contact angle measured by experiments is as high as 150 degrees or above. The hydrophobic graphene aerogel can be used in the fields of protection and removal of volatile organic compounds in air and water, and other oil-water separation applications.

Description

technical field [0001] The invention belongs to the technical field of graphene airgel, and in particular relates to a preparation method and application of a hydrophobic graphene airgel. Background technique [0002] Graphene airgel is a new type of porous material. Its synthesis method usually requires the use of graphene oxide as the raw material of the reaction precursor. After adding a cross-linking agent (also called a reducing agent), the cross-linking agent and Graphite oxide undergoes a copolymerization reaction to obtain an ultra-light porous material formed by three-dimensional assembly of graphene thin layers. [0003] In order to make graphene airgel have higher strength and be able to be used in the fields of oil-water separation, environmental pollutant protection and control, etc., graphene airgel can be subjected to high-temperature annealing treatment to remove residual residues on the surface of graphene airgel material. Hydroxyl or other hydrophilic grou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194C01B32/19B01J13/00B01J20/20B01J20/28B01J20/30B01D53/02B01D17/022
CPCC01B32/194C01B32/19B01J13/0091B01J20/20B01J20/28047B01J20/3078B01J20/3085B01D53/02B01D17/0202C01B2204/20B01D2257/708Y02A50/20
Inventor 秦君李小梅冯锋田利军苏铭高磊辛智慧
Owner SHANXI DATONG UNIV
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