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Preparation method of magnetic graphene aerogel

A technology of magnetic graphene and graphene hydrogel, which is applied in the preparation of magnetic graphene airgel and the field of magnetic aerogel preparation, can solve the problems of complex preparation of magnetic graphene foam materials in large quantities, and achieve mechanical properties Good, wide application prospect, low density effect

Active Publication Date: 2017-09-08
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of extrudable and super-hydrophobic magnetic graphene foam material with low cost, simple synthesis method and easy large-scale production in order to solve the technical problem of complex preparation of magnetic graphene foam material in large quantities and limit its practical application. The preparation method of graphene airgel material, the method uses dopamine to modify graphene oxide and iron ion to cross-link, then heat reduction, self-assemble into a three-dimensional graphene hydrogel structure, after freeze-drying and heat treatment, in situ Magnetic Graphene Airgel Materials

Method used

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  • Preparation method of magnetic graphene aerogel
  • Preparation method of magnetic graphene aerogel
  • Preparation method of magnetic graphene aerogel

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Experimental program
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Effect test

Embodiment 1

[0020] a. Dissolve graphite oxide in deionized water, and ultrasonically disperse to form a uniform graphene oxide aqueous solution with a concentration of 1 mg / mL;

[0021] b. Add 0.5 mg / mL dopamine and 0.1 mg / mL ferric nitrate to the graphene oxide solution obtained in step a, stir evenly with a magnetic force, and keep it warm for 24 hours under hydrothermal conditions at a constant temperature of 100° C. to obtain graphene hydrogel glue;

[0022] c. Freeze-drying the graphene hydrogel obtained in step b for 1 day to obtain a freeze-dried sample;

[0023] d. Heat the freeze-dried sample obtained in step c to 800° C. at a temperature of 1° C. / min in an oxygen-free environment, heat it for 6 hours, and obtain the magnetic graphene airgel material after natural cooling.

Embodiment 2

[0025] a. Dissolve graphite oxide in deionized water, and ultrasonically disperse to form a uniform graphene oxide aqueous solution with a concentration of 2 mg / mL;

[0026] b. Add 0.75 mg / mL dopamine and 5 mg / mL ferric chloride to the graphene oxide solution obtained in step a, stir evenly with a magnetic force, and keep it warm for 18 hours under hydrothermal conditions at a constant temperature of 120° C. to obtain graphene hydrogel glue;

[0027] c. Freeze-drying the graphene hydrogel obtained in step b for 1 day to obtain a freeze-dried sample;

[0028] d. Heat the freeze-dried sample obtained in step c to 850° C. at a temperature of 3° C. / min in an oxygen-free environment, heat it for 4 hours, and then cool naturally to obtain a magnetic graphene airgel material.

Embodiment 3

[0030] a. Dissolve graphite oxide in deionized water, and ultrasonically disperse to form a uniform graphene oxide aqueous solution with a concentration of 4 mg / mL;

[0031] b. Add 1 mg / mL dopamine and 10 mg / mL ferric sulfate to the graphene oxide solution obtained in step a, stir evenly with magnetic force, and keep it warm for 12 hours under hydrothermal conditions at a constant temperature of 140° C. to obtain a graphene hydrogel;

[0032] c. Freeze-drying the graphene hydrogel obtained in step b for 1 day to obtain a freeze-dried sample;

[0033] d. Heat the freeze-dried sample obtained in step c to 900° C. at a temperature of 5° C. / min in an oxygen-free environment, heat it for 2 hours, and then cool naturally to obtain a magnetic graphene airgel material.

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Abstract

The invention relates to a preparation method of magnetic graphene aerogel. The preparation method comprises the steps of crosslinking dopamine modified graphene oxide with iron ions, carrying out heating reduction and self-assembling to form a three-dimensional graphene aerogel structure, and carrying out freeze drying and thermal treatment, so as to obtain a magnetic graphene aerogel material in situ. The preparation method which is simple in operation and preparation process and low in cost is utilized for preparing the magnetic graphene aerogel material with stable structure and good uniformity in situ and is a new technique for massively preparing the magnetic graphene aerogel material. The prepared material has good magnetic property, low density, good mechanical property, high temperature resistance, large specific surface area, super-strong adsorptive property, conductive property and wave absorbing property, is hopeful to be used as a novel functional magnetic material in the fields of water treatment, photoelectric materials, wave absorbing materials and the like and further has certain application values and market prospects.

Description

technical field [0001] The invention relates to a preparation method of a magnetic aerogel, in particular to a preparation method of a magnetic graphene aerogel, and belongs to the field of environmental functional materials. Background technique [0002] Magnetic porous materials have the characteristics of large specific surface area and light weight. At the same time, they also have the advantages of magnetic response and biocompatibility of magnetic materials. They have potential applications in the fields of water treatment, catalysis, biological applications, and microwave absorption. The above application fields not only require good magnetic properties, meet the necessary conditions for easy material recovery, strong targeting ability, and microwave adsorption, but also need to have the characteristics of low density, strong adsorption capacity, large specific surface area, and strong loading capacity. It is difficult for some materials to meet multiple performance r...

Claims

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Application Information

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IPC IPC(8): C01B32/184C01B32/194B01J13/00B01J20/28B01J20/20B01J20/30
CPCB01J13/0091B01J20/20B01J20/28009C01B2204/20C01P2006/10
Inventor 杨苏东马鹏程王春春胡美龙
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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