Method for purifying oxidized graphene

A purification method and graphene technology, applied in the field of graphene oxide purification, can solve the problems of high purification cost of graphene oxide, inability to generate large area, restricting graphene, etc., achieving controllable purification process, realizing macro-scale preparation, Effects without equipment investment

Inactive Publication Date: 2015-06-10
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the molecular dialysis membranes sold on the market are expensive and cannot be produced in a large area, which leads to high purification costs of graphene oxide, which seriously restricts the macro-scale production of graphene prepared by chemical methods.

Method used

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  • Method for purifying oxidized graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Graphite oxide was prepared by the modified Hummers method using 325 mesh natural flake graphite. The pH of the obtained graphite oxide solution is 0.5, the concentration is 50 mg / mL, add deionized water and stir evenly, let it stand for 12 hours until the graphite oxide is separated from the water phase, remove the last clear liquid, then add 500 ml of water, let it stand for precipitation, repeat Several times until the graphene oxide solution turns from bright yellow to dark brown. The pH of the graphite oxide solution was tested to be 1.0, the concentration was 8 mg / ml, and the graphene oxide solution was obtained by ultrasonication for 30 minutes. The solution was packaged in a 400-mesh nylon fabric bag, and placed in a circulating deionized water pool for cleaning, dialysis, and water storage. The mass ratio of water to graphene oxide is 10:1. Repeatedly replace the deionized water several times to increase the concentration difference inside and outside, and acce...

Embodiment 2

[0023] The preparation method of graphene oxide solution and the primary purification of graphite oxide solution are the same as in Example 1. Test that the graphite oxide solution cannot be independently separated and pre-purified again under the condition of pH=1.5. Adjust the concentration at 4 mg / ml, and obtain a graphene oxide solution by ultrasonication for 1 h. The solution is packaged in a 600-mesh nylon fabric bag and placed in a Dialysis and purification in deionized water, the mass ratio of water storage to graphene oxide is 20:7, repeated replacement of deionized water several times, increasing the concentration difference inside and outside, accelerating the dialysis speed, and testing the pH of the graphene oxide solution inside the nylon fabric bag after 9 days= 4.0, collect the graphene oxide dispersion, and freeze-dry to prepare graphene oxide powder.

[0024] Electron microscope observation results show that the few layers of graphene oxide prepared under thi...

Embodiment 3

[0026] The preparation method of graphene oxide solution and the primary purification of graphite oxide solution are the same as in Example 1. Test that the graphite oxide solution cannot be independently separated again under the condition of pH=1.0. The pre-purification is completed. Adjust the concentration at 2 mg / ml, and obtain a graphene oxide solution by ultrasonication for 1 h. The solution is packaged in an 800-mesh nylon fabric bag, and placed in a Purification by dialysis in deionized water, the mass ratio of water storage capacity to graphene oxide is 5:1, repeated replacement of deionized water several times, increasing the concentration difference inside and outside, and accelerating the dialysis speed. After 10 days, test the pH of the graphene oxide solution inside the nylon fabric bag= 3.0, collecting the graphene oxide dispersion, freeze-drying, and preparing graphene oxide powder.

[0027] The composition analysis results show that the graphene oxide prepare...

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Abstract

The invention discloses a method for purifying oxidized graphene. The method is characterized in that an easy layering phenomenon of a high-acidity oxidized graphene solution and deionized water is employed, oxidized graphene is purified in advance for repeatedly multiple times, then ultrasonic dispersion is carried out to prepare the oxidized graphene solution, finally, the oxidized graphene solution is sealed in an organic polymer synthetic fabric bag, dialysis is carried out in a cycle deionized water pool to prepare the high-purity oxidized graphene solution, and performing freeze drying to obtain the oxidized graphene powder. The method has the advantages of simple and easy control, and low cost of raw materials, equipment investment cost with high price during an industrial production process can be avoided, and low cost industrial preparation of the oxidized graphene material can be realized.

Description

technical field [0001] The invention relates to a method for purifying graphene oxide. Background technique [0002] Since the concept of graphene was proposed by the research group led by A.K. Geim of the University of Manchester in 2004, graphene, as another bright star in the carbon family, has been highly valued by physics, chemistry and materials scientists. Therefore, graphite Graphene has become another "universal material" that shines after carbon nanotubes (Science 2004, 306: 666.). Compared with carbon nanotubes, graphene has a perfect hybrid structure, and has attracted much attention for its ultra-high electrical conductivity, extremely fast electron transport speed, high hardness, high specific surface area, and room temperature quantum Hall effect ( Nat. Mater. 2007 , 6 , 183; Science 2009 , 324 , 1530.). So far, researchers have conducted extensive research on the preparation of graphene, and there are many literature reviews at home and abroad about t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 阎兴斌杨娟薛群基
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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