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Method for preparing graphene

A graphene and precursor technology, applied in the field of graphene preparation, can solve the problems of affecting product quality and low degree of graphitization of biomass materials, and achieve the effect of strong electronegativity

Active Publication Date: 2015-05-06
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the catalytic activation method does not use strong acids and strong oxidants, it has less environmental pollution. However, the graphene prepared by the existing catalytic activation technology can only graphitize the surface of the material, and the overall graphitization degree of the biomass material is not high. , affecting product quality

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preparation example Construction

[0037] The invention provides a kind of preparation method of graphene, comprises the following steps:

[0038] A) mixing biomass material, anionic surfactant and water, and performing a hydrothermal reaction to obtain a precursor, the temperature of the hydrothermal reaction is 150-250°C, and the time of the hydrothermal reaction is 1-24 hours;

[0039] B) mixing the metal catalyst with the precursor obtained in step A) to obtain a precursor containing the metal catalyst;

[0040] C) heating the metal catalyst-containing precursor obtained in step B) to obtain graphene.

[0041] The degree of graphitization of the graphene obtained by the preparation method provided by the invention is relatively high, and the quality of the obtained product is relatively good.

[0042] In the present invention, the biomass material, anionic surfactant and water are mixed, and a hydrothermal reaction is carried out to obtain a precursor. In the present invention, the biomass material, anioni...

Embodiment 1

[0064] Take 10g of glucose and 1g of sodium lauryl sulfate, add it to 150ml of hydrofluoric acid aqueous solution with a concentration of 0.01mol / l, then ultrasonicate the obtained glucose solution for 5 minutes, pour it into a reaction kettle, and carry out hydrothermal treatment at 180°C After reacting for 10 hours, dry at 80°C to obtain a precursor.

[0065] Take 1g of precursor, add it to 100ml of solution containing 1g of potassium ferricyanide, ultrasonicate for 15 minutes, let stand for 4h, filter, and dry the filtered solid at 80°C to obtain iron ion-containing precursor. According to the mass ratio of iron ion-containing precursor to KOH, it is mixed with KOH at a ratio of 1:1, dried, and calcined at 1000°C for 2h under an inert atmosphere with a heating rate of 5°C / min. Wash with hydrochloric acid, filter, and dry the filtered solid at 120°C to obtain porous graphene.

[0066] The present invention has carried out transmission electron microscope detection (TEM) to ...

Embodiment 2

[0073]Take 20g of glucose and 1g of sodium dodecylbenzenesulfonate, add 150ml of deionized water, then ultrasonicate the resulting glucose solution for 5 minutes, pour it into a reaction kettle, and carry out hydrothermal reaction at 150°C. After 6 hours of reaction, 80 °C drying to obtain the precursor.

[0074] Take 1 g of the precursor, add it to 100 ml of a solution containing 0.5 g of ferric chloride, ultrasonicate for 15 minutes, let stand for 10 h, filter, and dry the filtered solid at 80° C. to obtain a precursor containing iron ions. Calcined at 800°C for 2 hours under an inert atmosphere with a heating rate of 5°C / min. The calcined product was washed with 1 mol / L hydrochloric acid, filtered, and the filtered solid was dried at 120°C to obtain graphene.

[0075] The present invention has carried out scanning electron microscope detection (SEM) to the precursor that present embodiment obtains, and the result is as follows Figure 7 as shown, Figure 7 The SEM figure ...

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Abstract

The invention provides a method for preparing graphene. The method comprises the following steps: (A) mixing a biomass material, an anionic surfactant and water to carry out a hydrothermal reaction at a temperature of 150-250 DEG C for 1-24 hours to obtain a precursor; (B) mixing a metal catalyst with the precursor obtained in the step (A) to obtain a precursor containing the metal catalyst; and (C) heating the precursor containing the metal catalyst obtained in the step (B) to obtain graphene. According to the preparation method, the biomass material is used as a carbon source, the biomass material reacts under a hydrothermal condition to generate a gaseous-phase product, the anionic surfactant can be used for enriching bubbles and the biomass material in a bulk phase solution, and the bubbles are used as a template to form hollow carbon spheres so as to obtain the precursor which has a relatively thin spherical shell layer and relatively high surface activity and can be easily catalyzed by a metal catalyst, and graphene having relatively high graphitizing degree can be obtained.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, in particular to a method for preparing graphene. Background technique [0002] Graphene is the thinnest two-dimensional material in the world. Its thickness is only 1 / 200,000th that of a hair, but its strength is the highest among known materials, 100 times higher than the best steel. The force required to cross-section a single layer of graphene is 200 times that of steel. The study found that 100nm graphene can withstand a maximum pressure of about 2.9 micronewtons, which is equivalent to applying a pressure of 55 newtons to break a 1m-long graphene. If a graphene film with a thickness of 100nm is made, it can withstand a pressure of about 20,000 Newtons, so a packaging bag made of graphene can carry items weighing about two tons, which fully demonstrates that graphene is the strongest material in the world . [0003] In recent years, people continue to explore new methods to incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 吕彬彬刘兆平周旭峰郑超王国华沈鲁恺姜萍
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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