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Preparation method and application of functionalized graphene-based aerogel

A technology of airgel and graphene, which is applied in the field of preparation of functionalized graphene-based airgel, can solve problems such as unsatisfactory adsorption performance, and achieve the effects of high specific surface area, increased adsorption capacity, and high adsorption performance

Pending Publication Date: 2019-09-27
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional sol-gel method prepares functionalized graphene-based aerogels. Because chitosan itself forms a skeleton, a large number of amino groups and hydroxyl groups are covered in its skeleton, resulting in unsatisfactory adsorption properties.

Method used

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  • Preparation method and application of functionalized graphene-based aerogel
  • Preparation method and application of functionalized graphene-based aerogel
  • Preparation method and application of functionalized graphene-based aerogel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of functionalized graphene-based airgel, comprising the following steps:

[0030] Step 1. Add 60 mg of chitosan to 30 mL of graphene oxide dispersion, then adjust the pH to 6-7 with 1 mol / L hydrochloric acid, and stir to obtain a mixed solution; the concentration of the graphene oxide dispersion is 2 mg / mL ;

[0031] Step 2, adding the mixed solution into a high-pressure reactor for hydrothermal reaction to obtain a wet gel; the temperature of the hydrothermal reaction is 180° C., and the reaction time is 12 hours;

[0032] Step 3: Soak the wet gel in alcohol and acetone for 3 times in sequence, 24 hours each time, and finally use CO 2 Functionalized graphene-based aerogels were obtained by supercritical drying.

Embodiment 2

[0034] A preparation method of functionalized graphene-based airgel, comprising the following steps:

[0035] Step 1, add 120mg chitosan in 30mL graphene oxide dispersion liquid, then adopt 1mol / L hydrochloric acid to adjust pH to 6~7, stir, obtain mixed liquid; The concentration of described graphene oxide dispersion liquid is 2mg / mL ;

[0036] Step 2, adding the mixed solution into a high-pressure reactor for hydrothermal reaction to obtain a wet gel; the temperature of the hydrothermal reaction is 180° C., and the reaction time is 12 hours;

[0037]Step 3: Soak the wet gel in alcohol and acetone for 3 times in sequence, 24 hours each time, and finally use CO 2 Functionalized graphene-based aerogels were obtained by supercritical drying.

Embodiment 3

[0039] A preparation method of functionalized graphene-based airgel, comprising the following steps:

[0040] Step 1, add 240mg chitosan in 30mL graphene oxide dispersion liquid, then adopt 1mol / L hydrochloric acid to adjust pH to 6~7, stir, obtain mixed liquid; The concentration of described graphene oxide dispersion liquid is 2mg / mL ;

[0041] Step 2, adding the mixed solution into a high-pressure reactor for hydrothermal reaction to obtain a wet gel; the temperature of the hydrothermal reaction is 180° C., and the reaction time is 12 hours;

[0042] Step 3: Soak the wet gel in alcohol and acetone for 3 times in sequence, 24 hours each time, and finally use CO 2 Functionalized graphene-based aerogels were obtained by supercritical drying.

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Abstract

The invention discloses a preparation method of functionalized graphene-based aerogel. The preparation method comprises the following steps: step 1, adding chitosan in graphene oxide dispersion liquid, then adjusting the pH, and stirring to obtain mixed liquor; step 2, adding the mixed liquor into a high-pressure reaction kettle for performing a hydrothermal reaction to obtain wet gel; step 3, performing solvent exchanging immersion on the wet gel by using alcohol and acetone in sequence three times respectively for 24 h each time, and finally performing supercritical drying by adopting CO2 to obtain the functionalized graphene-based aerogel. The functionalized graphene-based aerogel prepared by the method is obtained by performing the hydrothermal reaction and the supercritical drying by taking the cheap and easily available chitosan and graphene oxide as raw materials. According to the preparation method, through attaching the chitosan to graphene oxide lamella, amino groups and hydroxyl groups are enabled to be exposed to the surface of the aerogel to the greatest extent, thereby improving the adsorption quantity of the aerogel to heavy metal ions Pb<2+> and Cu<2+>. According to the preparation method, the raw materials are low in cost; the operational process is simple; industrialization is expected to be realized.

Description

technical field [0001] The invention relates to the field of airgel material preparation, in particular to a preparation method and application of functionalized graphene-based airgel. Background technique [0002] With the development of heavy industry, a large amount of industrial wastewater containing heavy metal ions is discharged into the human living environment, which seriously threatens human health. At present, sewage treatment has become a research hotspot for researchers around the world. From the perspective of economy and efficiency, the development of efficient adsorbent is an effective way to treat sewage, and density and specific surface area are important factors affecting the adsorption performance of adsorbents. Porous carbon materials are often used in the field of adsorption due to their low density, low price, high specific surface area, good mechanical properties, and stable physical and chemical properties. Among all porous carbon materials, graphen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30B01J13/00C02F1/28C02F101/20
CPCB01J20/20B01J20/24B01J20/28047B01J13/0091C02F1/286C02F1/283B01J2220/4825B01J2220/4806B01J2220/4812B01J2220/46C02F2101/20
Inventor 朱家艺谢子楷任洪波毕于铁
Owner SOUTHWEAT UNIV OF SCI & TECH
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