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Preparation method of reduced graphene oxide base composite membrane

A graphene-based, composite film technology, applied in the direction of graphene, chemical instruments and methods, carbon compounds, etc., to achieve the effect of strong process universality, strong universality, and simple operation

Pending Publication Date: 2019-08-13
庄鹏宇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, there is a lack of a general method for preparing graphene-based composite membranes that can improve the stability and flexibility of graphene-based composite membranes.

Method used

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  • Preparation method of reduced graphene oxide base composite membrane
  • Preparation method of reduced graphene oxide base composite membrane
  • Preparation method of reduced graphene oxide base composite membrane

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preparation example Construction

[0035] The general preparation method of the reduced graphene oxide-based composite film of the present invention comprises the following steps:

[0036] (1) Stir for 1h-96h and sonicate for 0h-24h to prepare a graphene oxide dispersion with a concentration of 1mg / mL-50mg / mL, where 0h means that you can choose not to sonicate but only stir;

[0037] (2) Add soluble polymers such as water-soluble polymers or other solvent-soluble polymers to the graphene oxide dispersion obtained in step (1), stir and prepare a mixed solution, or prepare an aqueous solution of the polymer or a solution containing other solvents solution, and then the polymer solution is stirred with the graphene oxide dispersion in step (1) to form a mixed solution, wherein the polymer weight is usually 0%-50% of the graphene oxide weight, but can be adjusted appropriately according to specific applications;

[0038] (3) Add 0%-50% nanoparticles relative to the weight of graphene oxide in the graphene oxide dis...

Embodiment 1

[0056] Step (a): Disperse 1 g of graphene oxide with a size of 10 μm in 200 mL of water, stir for 10 h, and sonicate for 2 min to obtain a graphene oxide dispersion;

[0057] Step (b): add 25% carboxylated chitosan relative to the graphene oxide content to the graphene oxide dispersion obtained in step a, stir for 5 hours, and after ultrasonication for 10 minutes, take out 4 mL of the mixed solution and pour it into a 50 mL inner diameter of 2.96 cm. In the tetrafluoroethylene lining, it is sealed and then put into the reactor.

[0058] Step (c): Seal the reaction kettle in step b and put it into a 120° C. vacuum oven for hydrothermal reaction for 12 hours to obtain a reduced graphene oxide-based composite hydrogel.

[0059] Step (d): freezing the composite hydrogel obtained in step c at -100° C., and freeze-drying to obtain a reduced graphene oxide / chitosan composite film.

[0060] The composite film obtained by this method has a thickness of 1-50mm and a density of 8-20mg / c...

Embodiment 2

[0062] Step (a): Disperse 1 g of graphene oxide with a size of 10 μm in 200 mL of water, stir for 10 h, and sonicate for 2 min to obtain a graphene oxide dispersion;

[0063] Step (b): Add 10% silicon nanoparticles with graphene oxide content to the graphene oxide dispersion obtained in step a, stir for 30 min, and ultrasonically for 2 min, take out 1 mL of the mixed solution and pour it into a 20 mL glass bottle, seal it and put it into a 50 mL poly In the tetrafluoroethylene lining, it is sealed and then put into the reactor.

[0064] Step (c): Seal the reaction kettle in step b and put it into a 120° C. vacuum oven for hydrothermal reaction for 12 hours to obtain a reduced graphene oxide / silicon composite hydrogel.

[0065] Step (d): freezing the composite hydrogel obtained in step c at -30°C, and freeze-drying to obtain a reduced graphene oxide / silicon composite membrane.

[0066] The reduced graphene oxide film obtained by this method has a thickness of 1-20mm and a dens...

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Abstract

The invention discloses a preparation method of a reduced graphene oxide base composite membrane. The method comprises the steps that graphene oxide is adopted as a raw material and mixed with other substances in water or other solvents, the reduced graphene oxide base composite membrane or a reduced graphene oxide base composite gel membrane is prepared through a hydrothermal reaction or a solvothermal reaction in a reaction kettle, and the reduced graphene oxide base composite gel is converted into the composite membrane through freeze drying or supercritical drying. The synthesized composite membrane can be wetted and dried in a solvent to obtain a thinner composite membrane. The reduced graphene oxide base composite membrane can be reduced through high temperature to obtain the reducedgraphene oxide base composite membrane with the higher graphene reducing degree and the perfect crystal structure.

Description

technical field [0001] The invention relates to a preparation method of a reduced graphene oxide-based composite film. [0002] technical background [0003] Graphene is a new type of one-atom-thick two-dimensional nanocrystalline material. Due to its excellent mechanical properties, electrical properties, thermal conductivity, and stability, graphene-based materials have attracted extensive research interest in both academia and industry. The difficulty of water solubility of graphene greatly limits the research of graphene-based composite materials. Therefore, people first synthesize graphene derivatives with good water solubility - graphene oxide, and prepare graphene oxide composite materials by compounding with other materials, and then repair the graphene structure by chemical reduction or thermal reduction to synthesize graphene-based composite materials. Such as aerogels, fibers and membranes. [0004] Graphene-based composite materials have broad application prosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/194C01B33/02B82Y30/00C01B32/168C08J5/18C08J3/075C08L5/08C08K3/04
CPCC01B33/02B82Y30/00C08J5/18C08J3/075C08J2305/08C08K3/04
Inventor 庄鹏宇
Owner 庄鹏宇
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