Method for preparing graphene oxide

A fossil and graphene technology, applied in the field of graphene oxide preparation, can solve the problems of long time consumption, low efficiency, difficulty in suction filtration or centrifugation, etc., and achieve the effects of improving efficiency, simplifying washing steps, and overcoming the difficulty of solid-liquid separation

Inactive Publication Date: 2014-01-29
TAISHAN MEDICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above-mentioned separation and purification process of graphite oxide, each step of suction filtration or centrifugal treatment is very difficult, especially in the process of washing graphite oxide...

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  • Method for preparing graphene oxide
  • Method for preparing graphene oxide

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Embodiment 1

[0023] A method for preparing graphene oxide, comprising the steps of:

[0024] (1) Preparation of graphite oxide:

[0025] (1a) Add 10g of natural flake graphite, 10g of potassium persulfate and 10g of phosphorus pentoxide into 100ml of concentrated sulfuric acid, ultrasonically disperse for 5min, stir magnetically in an oil bath at 80°C for 6h, vacuum-dry the filter cake after vacuum filtration and washing , Grinding.

[0026] (1b) Put the dried ingredients into a beaker, add 500ml of concentrated sulfuric acid and ultrasonically disperse evenly, slowly add 60g of potassium permanganate and stir electrically for 4 hours under the protection of an ice-water bath; add 1L of deionized water and transfer the mixture into a water bath Keep the pot at 40°C and continue stirring for 2h.

[0027] (1c) Stop stirring and add 3L of deionized water, then add 80ml of hydrogen peroxide to obtain a bright yellow graphite oxide suspension.

[0028] (2) Separation and purification of grap...

Embodiment 2

[0034] A method for preparing graphene oxide, comprising the steps of:

[0035] (1) Preparation of graphite oxide:

[0036] (1a) Add 10g of natural flake graphite, 10g of potassium persulfate and 10g of phosphorus pentoxide into 100ml of concentrated sulfuric acid, ultrasonically disperse for 5min, stir magnetically in an oil bath at 80°C for 6h, vacuum-dry the filter cake after vacuum filtration and washing , Grinding.

[0037] (1b) Put the dried ingredients into a beaker, add 500ml of concentrated sulfuric acid and ultrasonically disperse evenly, slowly add 60g of potassium permanganate and stir electrically for 4 hours under the protection of an ice-water bath; add 1L of deionized water and transfer the mixture into a water bath Keep the pot at 40°C and continue stirring for 2h.

[0038] (1c) Stop stirring and add 5L of deionized water, then add 80ml of hydrogen peroxide to obtain bright yellow graphite oxide suspension.

[0039] (2) Separation and purification of graphi...

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Abstract

The invention relates to a method for preparing graphene oxide, belonging to the technical field of preparation of graphene oxide. The method comprises the following steps: firstly, preparing graphite oxide by adopting a chemical treatment method for natural crystalline flake graphite; then, separating and purifying the graphite oxide; and finally, mixing the purified graphite oxide with water, carrying out ultrasonic dispersion to obtain stable dispersion liquid, and spraying and drying the dispersion liquid to obtain graphene oxide powder. According to the method for preparing graphene oxide, effective separation of graphite oxide solid and aqueous liquor is realized by room-temperature natural settling of graphite oxide suspension, most of inorganic ion impurities generated in a preparation process are removed with supernatant liquid, so that a washing step is simplified. Moreover, a centrifugal washing method of absolute ethyl alcohol is adopted, solid-liquid separation in a centrifugal process is very easy to implement, a problem that solid-liquid separation is difficult in a water-washing process is overcome, time is greatly saved, and efficiency is improved.

Description

technical field [0001] The invention relates to a method for preparing graphene oxide, which belongs to the technical field of graphene oxide preparation. Background technique [0002] Graphene is a new type of two-dimensional planar carbon nanomaterial discovered in 2004. Its special single atomic layer structure endows it with excellent mechanical, electrical and thermal properties. Graphene has shown exciting properties and application prospects in the fields of microelectronics, quantum physics, materials, and chemistry, and has become an international frontier and hot spot that has attracted much attention. At present, the preparation methods of graphene include mechanical exfoliation method, chemical vapor deposition method, epitaxial growth method, electrochemical method and chemical redox method. Except for the chemical redox method, most of the above methods have problems such as low yield, high cost, difficult quality control and inability to scale up. The chemic...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/198
Inventor 董建徐玉良安瑞冰李克朋朱德振刘金宇
Owner TAISHAN MEDICAL UNIV
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