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Preparation method and application of a highly elastic layered graphene oxide composite airgel

A graphene composite and high-elasticity technology, applied in airgel preparation, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems of low ozone catalytic ability, graphene oxide airgel compressibility and low elasticity and other problems, to achieve strong ozone catalytic ability, improve adsorption effect, and large specific surface area

Active Publication Date: 2022-05-03
浙江晶鑫特种纸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] One of the purposes of the present invention is to provide a method for preparing a highly elastic layered graphene oxide composite airgel to solve the problem of compressibility and elasticity of the graphene oxide airgel prepared by the existing preparation process in the background art. minor problem
[0007] The second object of the present invention is to provide an application of a highly elastic layered graphene oxide composite aerogel to solve the problem that the existing aerogels in the background technology have less catalytic ability to ozone in wastewater treatment

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Embodiment 1

[0038] A kind of preparation method of highly elastic layered graphene oxide composite airgel of the present embodiment, the specific preparation steps are as follows:

[0039] (1) Mixing and dispersion of raw materials: Use a high-speed emulsifier to disperse graphene oxide powder in a cellulose nanofibril suspension with a solid content of 1.0%, in which the amount of graphene oxide is 10wt%, and perform high-speed emulsification and dispersion at a speed greater than 5000r / min, the dispersion time is not less than 30min, to obtain graphene oxide nanofibril suspension;

[0040] (2) Ozone catalyst mixing and dispersion: Add nanoscale powdered MnO to the graphene oxide nanofibril suspension prepared in step (1) under the condition of stirring line speed of 25m / s 2 / γ-Al 2 o 3 / TiO 2 Composite catalyst, dispersed for at least 30min, to obtain a mixed suspension; wherein, nano-scale powdery MnO 2 / γ-Al 2 o 3 / TiO2 The consumption of composite catalyst is 8.0% of graphene o...

Embodiment 2

[0047] A kind of preparation method of highly elastic layered graphene oxide composite airgel of the present embodiment, the specific preparation steps are as follows:

[0048] (1) Mixing and dispersion of raw materials: Use a high-speed emulsifier to disperse the graphene oxide powder in the cellulose nanofibril suspension with a solid content of 1.0%, in which the amount of graphene oxide is 15wt%, and carry out high-speed emulsification and dispersion at a speed greater than 5000r / min, the dispersion time is not less than 30min, to obtain graphene oxide nanofibril suspension;

[0049] (2) Ozone catalyst mixing and dispersion: Add nanoscale powdered MnO to the graphene oxide nanofibril suspension prepared in step (1) under the condition of stirring line speed of 25m / s 2 / γ-Al 2 o 3 / TiO 2 Composite catalyst, dispersed for at least 30min, to obtain a mixed suspension; wherein, nano-scale powdery MnO 2 / γ-Al 2 o 3 / TiO 2 The consumption of composite catalyst is 9.0% of ...

Embodiment 3

[0055] A kind of preparation method of highly elastic layered graphene oxide composite airgel of the present embodiment, the specific preparation steps are as follows:

[0056] (1) Mixing and dispersion of raw materials: Use a high-speed emulsifier to disperse the graphene oxide powder in the cellulose nanofibril suspension with a solid content of 1.0%, in which the amount of graphene oxide is 20wt%, and carry out high-speed emulsification and dispersion at a speed greater than 5000r / min, the dispersion time is not less than 30min, to obtain graphene oxide nanofibril suspension;

[0057] (2) Ozone catalyst mixing and dispersion: Add nanoscale powdered MnO to the graphene oxide nanofibril suspension prepared in step (1) under the condition of stirring line speed of 25m / s 2 / γ-Al 2 o 3 / TiO 2 Composite catalyst, dispersed for at least 30min, to obtain a mixed suspension; wherein, nano-scale powdery MnO 2 / γ-Al 2 o 3 / TiO 2 The consumption of composite catalyst is 10% of g...

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Abstract

The invention discloses a preparation method and application of a highly elastic layered graphene oxide composite airgel, comprising the following steps: (1) raw material pretreatment, (2) catalyst mixing and dispersion, (3) high elastic crosslinking agent Adding, (4) directional pre-freezing, (5) freeze-drying; the present invention uses graphene oxide and cellulose nanofibrils as main raw materials to prepare composite airgel, which can improve the physical strength of composite airgel and ensure the use of Applicability in the process; graphene oxide composite aerogels with a layered structure are prepared by directional freezing to ensure the high elasticity of the aerogels. Acrylamide powder is used as a cross-linking agent, which not only improves the strength of graphene oxide composite airgel, but also does not affect its elasticity.

Description

technical field [0001] The invention belongs to the field of composite airgel preparation, and specifically relates to a preparation method and application of a highly elastic layered graphene oxide composite airgel. Background technique [0002] Airgel is a three-dimensional porous amorphous solid material with gas as the medium formed by gel desolventization, which has the characteristics of low density, high specific surface area and high porosity. Based on the above characteristics, airgel has great application potential in thermal insulation, catalysis, energy storage, environmental protection, and chemical industry. Graphene oxide is the oxidation product of graphene. It is a derivative of multifunctional graphene with a single atomic layer. It has a variety of oxygen-containing functional groups bonded by covalent bonds in the interior and edge of the two-dimensional plane, especially on the edge. To the central hydrophilic to lipophilic transition. [0003] Graphen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00B01J23/34C02F1/78
CPCC02F1/725C02F1/78B01J13/0091B01J23/34B01J23/002B01J2523/00B01J2523/31B01J2523/47B01J2523/72
Inventor 姚志伟张小龙矫立
Owner 浙江晶鑫特种纸业有限公司
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