Preparing method of porous graphene oxide

A graphene and graphene surface technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems that the etching process is difficult to control, the size and number of pores on the surface of porous graphene oxide cannot be controlled, etc.

Active Publication Date: 2018-09-28
INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, H 2 o 2 or HNO 3 Reacting with graphene oxide, the etching process is not easy to control, and it is easy to produce many fragments. The size and number of surface pores of the prepared porous graphene oxide cannot be controlled

Method used

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  • Preparing method of porous graphene oxide
  • Preparing method of porous graphene oxide
  • Preparing method of porous graphene oxide

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preparation example Construction

[0030] refer to figure 1 , figure 1 It is a schematic flow diagram of the preparation method of the present invention. The method for preparing porous graphene oxide of the present invention mainly comprises the following steps: first prepare the composite of graphene oxide / magnetic transition metal oxide nanoparticles: graphene oxide (about 500nm in sheet diameter, figure 1 Substance A, prepared according to the method described in Ref: Nano Research 2015,8(4):1259-1268,) dispersed in ethanol and mixed with iron or cobalt or nickel salt solution, heated at 60-90°C 8 to 30 hours to grow seed crystals on the surface of graphene oxide to prepare a composite of graphene oxide / magnetic transition metal oxide nanoparticles, during which the magnetic transition metal ions form magnetic transition metal oxide nanoparticles. Then carry out seed growth and reduction on the composite of graphene oxide / magnetic transition metal oxide nanoparticles: transfer the above composite together...

Embodiment 1

[0036] Porous graphene oxide with nanopores of 40-50 nm and 5-6 holes per graphene oxide sheet is prepared.

[0037] a. Preparation of graphene oxide / magnetic transition metal oxide nanoparticles composites.

[0038] 10mg of graphene oxide freeze-dried powder A1 (sheet diameter 500nm, prepared according to the method described in Ref: Nano Research 2015,8(4):1259-1268) was dispersed in 25ml of ethanol, and cobalt (II) acetylacetonate ( Co(acac) 2 ) ethanol solution (Co 2+ Concentration 0.2M, 1.2mL) mixed, heated at 80°C for 12h to grow seed crystals on the surface of graphene oxide to obtain a composite of graphene oxide / cobalt oxide nanoparticles.

[0039] b. Seed growth and reduction of the above complex.

[0040] The above complex was transferred together with the original solution into a 50ml autoclave, heated at 150°C for 3h, and the particles grew to 30-35nm. After cooling, it was centrifuged 3 times, washed 3 times with water, and washed 3 times with ethanol, and th...

Embodiment 2

[0047] Porous graphene oxide with nanopores of 15-20 nm and 1-2 holes per graphene oxide sheet is prepared.

[0048] a. Preparation of composites of graphene oxide / magnetic transition metal oxide nanoparticles.

[0049] 10mg of graphene oxide freeze-dried powder A2 (sheet diameter 500nm, prepared according to the method described in Ref: Nano Research 2015,8(4):1259-1268) was dispersed in ethanol, and Fe(NO 3 ) 2 Aqueous solution (Fe 2+ Concentration 0.2M, 0.6mL) were mixed, and heated at 80°C for 12h to grow seed crystals on the surface of graphene oxide, thereby obtaining a composite of graphene oxide / iron oxide nanoparticles.

[0050] b. Seed growth and reduction of the above complex.

[0051] The above complex was transferred together with the original solution into a 50ml autoclave, heated at 150°C for 3h, and the particles grew to 10-15nm. After cooling, it was centrifuged 3 times, washed 3 times with water, and washed 3 times with ethanol, and then dried at room tem...

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Abstract

The invention provides a preparing method of porous graphene oxide. The method includes the following steps of a, preparing a composite of graphene oxide / magnetic transition metal oxide nanoparticles;b, conducting seed crystal growth and reduction on the composite of graphene oxide / magnetic transition metal oxide nanoparticles; c, conducting microwave reaction on the processed composite of graphene oxide / magnetic transition metal oxide nanoparticles to obtain a porous graphene oxide coarse product; d, conducting acid pickling on the obtained coarse product. By means of the preparing method, the size and number of nanometer pores in the surface of a prepared porous graphene oxide slice layer can be controlled by preparing the magnetic transition metal oxide nanoparticles of different sizesand densities on the surface of graphene oxide.

Description

technical field [0001] The invention relates to a method for preparing porous graphene oxide, in particular to a method for preparing porous graphene oxide by microwave-assisted etching of graphene oxide. Background technique [0002] Graphene, a one-atom-thick carbon sheet, has been expected to be used in various technical fields due to its various excellent physical and chemical properties. However, pristine graphene or chemically modified graphene sheets tend to overlap each other to form irreversible agglomerates through π–π stacking interactions and van der Waals forces, resulting in reduced properties, including severely reduced specific surface area and much lower mass diffusion rates. . In addition, graphene sheets require additional processing or additives to make the final product, which may further degrade the overall properties of graphene. [0003] The scalable preparation of dissolvably processable graphene and its bulk materials with high specific surface ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/198
CPCC01B32/198
Inventor 崔荣丽孙宝云
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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