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Preparation method of chitosan/reduced graphene oxide aerogel

A graphene aerogel, chitosan technology, applied in chemical instruments and methods, colloidal chemistry, colloidal chemistry and other directions, can solve the problems of small pore size, difficult to control shape, uncontrollable aerogel shape, etc. High strength, cost saving, good reduction effect

Pending Publication Date: 2021-11-09
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of preparation method of chitosan / reduced graphene oxide airgel, prepare the method for chitosan / reduced graphene oxide airgel by reducing graphene oxide in situ by hydrothermal method, solved The shape of the airgel prepared by the existing method is uncontrollable and the graphene sheet structure is stacked under the action of π-π conjugation, the pore size is small, and the shape is not easy to control.

Method used

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  • Preparation method of chitosan/reduced graphene oxide aerogel
  • Preparation method of chitosan/reduced graphene oxide aerogel
  • Preparation method of chitosan/reduced graphene oxide aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1. Add 0.04g graphene oxide to 10ml distilled water, and ultrasonicate for 30 minutes at room temperature to obtain graphene oxide suspension A1;

[0038] Step 2. 0.375g chitosan is added in batches to the graphene oxide suspension A1 stirred at 700r / min, kept stirring at room temperature for 2h, to obtain graphene oxide / chitosan suspension B1;

[0039] Step 3. Gradually drop 0.3ml of acetic acid into the graphene oxide / chitosan suspension B1, the chitosan dissolves rapidly, and the system becomes a high-viscosity solution C1;

[0040] Step 4. Transfer the high viscosity solution C1 into the Teflon liner;

[0041] Step 5. Put the polytetrafluoroethylene liner into the reactor and undergo a hydrothermal reaction at 90°C for 9 hours to obtain the chitosan / reduced graphene oxide solution D1.

[0042] Step 6. Chitosan / reduced graphene oxide solution D1 is cooled to normal temperature and put into the refrigerator for pre-freezing;

[0043] Step 7. Freeze-dry the pre-...

Embodiment 2

[0045] Step 1. Add 0.04g graphene oxide to 10ml distilled water, and ultrasonicate for 30 minutes at room temperature to obtain graphene oxide suspension A2;

[0046] Step 2. 0.375g chitosan is added in batches in the graphene oxide suspension A2 that 800r / min stirs, keep stirring 2h at room temperature, obtain graphene oxide / chitosan suspension B2;

[0047] Step 3. Gradually drop 0.3ml of acetic acid into the graphene oxide / chitosan suspension B2, the chitosan dissolves rapidly, and the system becomes a high-viscosity solution C2.

[0048] Step 4. Transfer the high viscosity solution C2 into the Teflon liner;

[0049] Step 5. Put the polytetrafluoroethylene liner into the reactor and undergo a hydrothermal reaction at 120° C. for 9 hours to obtain chitosan / reduced graphene oxide solution D2.

[0050] Step 6. Chitosan / reduced graphene oxide solution D2 is cooled to normal temperature and put into the refrigerator for pre-freezing;

[0051] Step 7. Freeze-dry the pre-frozen s...

Embodiment 3

[0053] Step 1. Add 0.04g graphene oxide to 10ml distilled water, and ultrasonicate for 30 minutes at room temperature to obtain graphene oxide suspension A3;

[0054] Step 2. 0.375g chitosan is added in batches in the graphene oxide suspension A3 of high-speed stirring, keeps high-speed stirring 2h at room temperature, obtains graphene oxide / chitosan suspension B3;

[0055] Step 3. Gradually drop 0.3ml of acetic acid into the graphene oxide / chitosan suspension B3, the chitosan dissolves rapidly, and the system becomes a high-viscosity solution C3.

[0056]Step 4. Transfer the high viscosity solution C3 into the Teflon liner;

[0057] Step 5. Put the polytetrafluoroethylene liner into the reactor and undergo a hydrothermal reaction at 150° C. for 9 hours to obtain chitosan / reduced graphene oxide solution D3.

[0058] Step 6. Chitosan / reduced graphene oxide solution D3 is cooled to normal temperature and put into the refrigerator for pre-freezing;

[0059] Step 7. Freeze-dry t...

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Abstract

The invention discloses a preparation method of chitosan / reduced graphene oxide aerogel, and relates to the technical field of graphene oxide aerogel preparation. The preparation method comprises the following steps: preparing a graphene oxide / chitosan high-viscosity solution by using graphene oxide and chitosan; and preparing a chitosan / reduced graphene oxide solution through a hydrothermal reaction, pre-freezing through a refrigerator, and then freeze-drying to obtain the finished product. The graphene oxide is reduced in a manner of cooperating hydrothermal reduction with chitosan reduction, and an additional reducing agent is not added, so that injury to experimenters and pollution to the environment are avoided, and the preparation cost of the reduced graphene oxide composite aerogel can be saved; a hydrothermal reaction and freeze drying method is adopted, so that the preparation process is short, the operation is simple, and a large amount of chitosan / reduced graphene oxide aerogel is rapidly and efficiently prepared; and the shape of the aerogel is controllable, the shape of the aerogel is controlled by selecting different molds, and the prepared aerogel has high strength and does not shrink.

Description

technical field [0001] The invention belongs to the technical field of graphene oxide airgel preparation, in particular to a preparation method of chitosan / reduced graphene oxide airgel. Background technique [0002] With the rapid development of aerogels, one-component aerogels are gradually unable to meet the needs of various fields. Especially in some high-end fields such as aerospace, electronic communication and other fields, while requiring light weight, good electrical conductivity, etc., high strength is also required. [0003] graphene as sp 2 The two-dimensional honeycomb crystal composed of hybridized carbon atoms is only one atomic size (about 0.34nm) thick, and forms stable chemical bonds with the surrounding carbon atoms. The remaining electrons on each carbon atom form a large π bond, and the electrons can Moving freely in it, this structure gives graphene good electrical conductivity. [0004] Therefore, more and more researchers have begun to turn their a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 观姗姗唐尧凯成尚儒王心成高强民
Owner QINGDAO UNIV OF SCI & TECH
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