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Preparation method of graphene

A graphene and graphite technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, inorganic chemistry, etc., can solve the problems of reducing agent environmental pollution, affecting the quality of graphene, and introducing impurities into products, etc., to achieve The preparation process is simple, conducive to wide application, and the effect of high purity and quality

Inactive Publication Date: 2014-05-21
ANKE SMART CITY TECH PRC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the technical problem to be solved in the present invention is to provide a green and non-toxic method for preparing graphene, so as to overcome the environmental pollution and harm to human health caused by the high toxicity of the reducing agent or the existence of flammable and explosive problems; At the same time, it also overcomes the problem that some reducing agents are easy to introduce impurities into the product during use and seriously affect the quality of graphene.

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Embodiment 1

[0028] A kind of method for preparing graphene that the embodiment of the present invention provides comprises the following steps:

[0029] S20, the preparation step of graphene oxide: add graphite oxide powder into deionized water, obtain the graphene oxide dispersion liquid of graphene oxide in deionized water by ultrasonic vibration; Wherein, the consumption ratio of graphite oxide powder and deionized water is 0.1 mg: 1ml ~ 1mg: 1ml, that is, add 0.1mg ~ 1mg graphite oxide powder per milliliter of deionized water.

[0030] S30, the preparation step of graphene: add caffeic acid powder to graphene oxide dispersion liquid, wherein, the mass ratio of caffeic acid powder and graphite oxide powder is 10:1~50:1; The obtained mixture oil bath is heated to 85 °C to 95 °C with continuous stirring, obtain a graphene solution through a reduction reaction for 2 hours to 24 hours, then filter through a microporous membrane to collect the product, and finally vacuum dry the product to ...

Embodiment 2

[0043] A kind of method for preparing graphene that the preferred embodiment of the present invention provides comprises the following steps:

[0044] S10, the preparation step of graphite oxide.

[0045]Specifically, natural graphite and the concentrated sulfuric acid that mass concentration is 98% are uniformly mixed at room temperature, wherein the consumption ratio of concentrated sulfuric acid and natural graphite is 25ml:1g, promptly adds 25 milliliters of concentrated sulfuric acid for every 1 gram of natural graphite; Add potassium permanganate in batches under the bath temperature and continue to stir, wherein the ice bath temperature refers to 0°C, and the mass ratio of potassium permanganate and natural graphite is 3.5:1 to 5.5:1, preferably 3.5:1; The obtained mixture was heated to 35°C in a water bath and stirred evenly, and after 2 hours of reaction, deionized water was added, wherein the ratio of deionized water to natural graphite was 100ml:1g, that is, 100 mil...

Embodiment 3

[0057] Mix natural graphite and concentrated sulfuric acid with a mass concentration of 98% evenly at room temperature, wherein the dosage ratio of concentrated sulfuric acid and natural graphite is 25ml:1g; add high manganese in 6 times within 2 hours at ice bath temperature (0°C) Potassium permanganate and continuous stirring, the time interval between every two additions is 20min, the mass ratio of potassium permanganate and natural graphite is 3.5:1. The resulting mixture was heated to 35°C in a water bath and stirred by a magnetic stirrer. Add deionized water after reacting for 2 hours, wherein the consumption ratio of deionized water and natural graphite is 100ml:1g, then add the hydrogen peroxide that mass concentration is 30%, wherein the consumption ratio of hydrogen peroxide and natural graphite is 8ml:1g, will obtain The solution was washed repeatedly with hydrochloric acid and deionized water. During the cleaning process, first use dilute hydrochloric acid with a ...

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Abstract

The invention discloses a preparation method of graphene, belonging to the technical field of nanomaterials. The method comprises the steps of adding graphite oxide powder into deionized water, and carrying out ultrasonic oscillation to obtain a graphene oxide dispersion liquid of the graphene oxide in the deionized water; adding green and nontoxic caffeic acid powder into the graphene oxide dispersion liquid to carry out reduction reaction to obtain a graphene solution; finally, filtering through a microporous filter membrane, collecting and carrying out vacuum drying to obtain graphene. By using the method, caffeic acid as a reducing agent widely exists in various plants so as to be green and nontoxic; in addition, the preparation method is simple in process, mild in reaction condition and free of causing environment pollution and generating hazards to human health; moreover, caffeic acid has strong reducing capacity, so that impurity elements or functional groups can not be introduced to a reduzate, the prepared graphene is high in purity and quality, and caffeic acid is suitable for the large-scale industrial production of the graphene and beneficial to the wide application of relevant materials of the graphene.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a method for preparing graphene. Background technique [0002] Graphene is a new type of carbon material with a single-layer sheet structure composed of carbon atoms. The atoms are arranged in a two-dimensional honeycomb shape in an ideal state. It is the thinnest material known in the world. Since its first discovery in 2004, graphene has aroused great research interests of many scientific researchers, and has become one of the research hotspots in the fields of materials, physics and chemistry in recent years. Due to its unique morphology and structure, graphene has excellent physical, chemical, thermal and mechanical properties, making it have broad application prospects in the fields of new composite materials, energy storage, catalysis and sensors. At the same time, the development and research of large-scale and low-cost graphene preparation processes is the key to p...

Claims

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Application Information

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IPC IPC(8): C01B31/04B82Y30/00B82Y40/00
CPCC01B32/192
Inventor 薄拯岑可法严建华池涌邱坤赞帅骁睿
Owner ANKE SMART CITY TECH PRC
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