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Graphene oxide and cellulose composite aerogel, and preparation method and use thereof

A composite airgel and graphene technology, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve the problem of low specific surface area of ​​airgel and low pollutant adsorption capacity, etc. problem, to achieve the effect of increasing porosity, strong adsorption capacity, and increasing adsorption capacity

Inactive Publication Date: 2019-09-13
ZHONGSU NEW TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The airgel prepared by this method has a low specific surface area and low adsorption capacity for pollutants.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The preparation method of the graphene oxide and cellulose composite airgel of the present invention comprises the following steps: (1) raw material mixing step; (2) foaming step; (3) post-treatment step.

[0025]

[0026] The graphene oxide is dispersed in water to form a graphene oxide dispersion; the reducing agent and cellulose are added to the graphene oxide dispersion, mixed, and ultrasonically dispersed to obtain an ultrasonic dispersion.

[0027] In the present invention, graphene oxide can be purchased from Changzhou Sixth Element Materials Technology Co., Ltd., with a sheet diameter of 20-25 μm and an oxygen-carbon molar ratio of 0.6. The graphene oxide is configured into a dispersion liquid, and the concentration of the graphene oxide in the dispersion liquid is 2-15 mg / ml. Preferably, the concentration of graphene oxide is 2-10 mg / ml. More preferably, the concentration of graphene oxide is 3-5 mg / ml.

[0028] In the present invention, the mass ratio of g...

Embodiment 1

[0044] Disperse 300 mg of graphene oxide in 60 ml of deionized water to form a graphene oxide dispersion. Add 900 mg of ascorbic acid to the graphene oxide dispersion, add 15 mg of hydroxypropyl cellulose under stirring conditions, and ultrasonically disperse for 30 minutes to obtain an ultrasonic dispersion.

[0045] Dissolve 150 mg of sodium dodecylbenzene sulfonate in 3 ml of deionized water to obtain a sodium dodecylbenzene sulfonate solution, then add it to the ultrasonic dispersion, stir and foam at a speed of 1000 rpm for 3 minutes, and prepare a foaming mixture liquid.

[0046] The foamed mixture was placed in an oven at 80°C, and after reduction reaction for 6 hours, it was naturally cooled to room temperature. Soak and wash the reduction reaction product with 1vol% ethanol aqueous solution for 24 hours, place the washed reduction reaction product in a -45°C refrigerator for 12 hours, take it out, melt it at room temperature, and dry it in a 60°C oven for 24 hours to...

Embodiment 2

[0048] Disperse 300 mg of graphene oxide in 60 ml of deionized water to form a graphene oxide dispersion. Add 900 mg of ascorbic acid to the graphene oxide dispersion, add 22.5 mg of hydroxypropyl cellulose under stirring conditions, and ultrasonically disperse for 20 minutes to obtain an ultrasonic dispersion.

[0049] Dissolve 150mg of sodium dodecylbenzenesulfonate in 3ml of deionized water to obtain a sodium dodecylbenzenesulfonate solution, then add it to the ultrasonic dispersion, stir and foam at a speed of 1000rmp for 3min, and prepare a foaming mixture .

[0050] The foamed mixture was placed in an oven at 80°C, and after reduction reaction for 6 hours, it was naturally cooled to room temperature. Soak and wash the reduction reaction product with 1vol% ethanol aqueous solution for 24 hours, place the washed reduction reaction product in a -45°C refrigerator for 12 hours, take it out, melt it at room temperature, and dry it in a 60°C oven for 24 hours to obtain graphi...

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Abstract

The invention discloses a preparation method of a graphene oxide and cellulose composite aerogel. The preparation method comprises the following steps: (1) dispersing graphene oxide in water to prepare a graphene oxide dispersion, adding a reducing agent and cellulose into the graphene oxide dispersion, performing mixing, and ultrasonically dispersing the obtained mixture to obtain an ultrasonic dispersion; (2) adding a foaming agent solution to the ultrasonic dispersion prepared in step (1), and stirring and foaming the obtained solution to obtain a foamed mixed solution; and (3) carrying outa reduction reaction on the foamed mixed solution prepared in step (2), cooling the obtained reaction product to room temperature, and washing, freeze-thawing and drying the reaction product to prepare the graphene oxide and cellulose composite aerogel. The graphene oxide and fiber composite aerogel prepared by the method has a high adsorption capacity. The invention also discloses the graphene oxide and cellulose composite aerogel prepared by the method, and an application thereof in the treatment of organic dye contaminants in sewage.

Description

technical field [0001] The invention relates to an airgel and its preparation method and application, in particular to graphene oxide and cellulose composite airgel and its preparation method and application. Background technique [0002] Graphene airgel has a uniform and dense pore distribution and a large specific surface area, which makes it have a strong adsorption capacity. The six-membered ring structure of graphene has π-π interaction with polar organic substances to form a stable complex, which enhances its adsorption capacity for polar organic substances. The negative charge on the surface of graphene further enhances its electrostatic attraction and adsorption capacity for cationic organics. However, graphene airgel has high hydrophobicity, which limits its application in water pollution treatment. At present, the hydrophilicity of graphene airgel is mainly improved by forming composite organic materials with graphene and other materials. [0003] CN105417526B d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/30C02F101/36C02F101/38
CPCB01J20/20B01J20/265B01J20/28047B01J20/3064C02F1/288C02F2101/308C02F2101/36C02F2101/38C02F2101/40
Inventor 童裳慧
Owner ZHONGSU NEW TECH CO LTD
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