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Porous graphene, graphene quantum dot and green preparation method of porous graphene and graphene quantum dot

A technology of graphene quantum dots and porous graphene, which is applied in the field of nanotechnology and new materials, to achieve the effects of uniform pore size distribution, simple and easy preparation method, and easy access to raw materials

Inactive Publication Date: 2016-04-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ultrasonic etching is also a top-down method. At present, there is no report on the one-step ultrasonic preparation of porous graphene and graphene quantum dots using graphite as a raw material.

Method used

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  • Porous graphene, graphene quantum dot and green preparation method of porous graphene and graphene quantum dot
  • Porous graphene, graphene quantum dot and green preparation method of porous graphene and graphene quantum dot
  • Porous graphene, graphene quantum dot and green preparation method of porous graphene and graphene quantum dot

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Experimental program
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Effect test

Embodiment 1

[0029] The volume concentration of preparation acetic acid is the acetic acid aqueous solution of 0.5%, and the weight-average molecular weight is 5.0 * 10 3 , the degree of deacetylation is 40% chitosan dissolved in acetic acid aqueous solution to prepare a chitosan solution with a mass concentration of 0.1 mg / mL, and stir evenly;

[0030] The graphite of 500mg is added in above-mentioned chitosan solution, obtains mixed solution; The mass ratio of control chitosan and graphite is 1:10;

[0031] The above mixed solution was placed in an ultrasonic cleaner for ultrasonic treatment at a temperature of 75° C. for 0.5 hour and an ultrasonic power of 600W.

[0032] The above ultrasonic solution was centrifuged at 1000rpm for 10 minutes, and then centrifuged with 0.5% acetic acid aqueous solution at 15000rpm for 0.5 hours. The precipitate obtained by centrifugation is porous graphene; after the centrifugal supernatant is dialyzed with a dialysis bag with a molecular weight cut-off...

Embodiment 2

[0034] The volume concentration of preparation acetic acid is the acetic acid aqueous solution of 2%, and the weight-average molecular weight is 2.0 * 10 4 , the degree of deacetylation is 53% chitosan dissolved in acetic acid aqueous solution to prepare a chitosan solution with a mass concentration of 0.2 mg / mL, and stir evenly;

[0035] The graphite of 200mg is added in above-mentioned chitosan solution, obtains mixed liquor; Control the mass ratio of chitosan and graphite to be 1:5;

[0036] The above mixture was put into an ultrasonic cleaner for ultrasonic treatment at a temperature of 60° C. for 2 hours and an ultrasonic power of 540W.

[0037] The above ultrasonic solution was centrifuged at 2000rpm for 10 minutes, and then centrifuged with 2% acetic acid aqueous solution at 20000rpm for 1 hour. The precipitate obtained by centrifugation is porous graphene; after the centrifugal supernatant is dialyzed with a dialysis bag with a molecular weight cut-off of 5000, the di...

Embodiment 3

[0039] The volume concentration of preparation acetic acid is the acetic acid aqueous solution of 4%, and the weight-average molecular weight is 1.5 * 10 5 , the degree of deacetylation is 60% chitosan is dissolved in the aqueous acetic acid solution, the obtained mass concentration is the chitosan solution of 0.5mg / mL, stirs evenly;

[0040] The graphite of 100mg is added in above-mentioned chitosan solution, obtains mixed liquor; Control the mass ratio of chitosan and graphite to be 1:1;

[0041] The above mixed solution was placed in an ultrasonic cleaner for ultrasonic treatment at a temperature of 30°C for 8 hours and an ultrasonic power of 480W.

[0042] The above ultrasonic solution was centrifuged at 2000rpm for 5 minutes, and then centrifuged with 4% acetic acid aqueous solution at 16000rpm for 1.5 hours. The precipitate obtained by centrifugation is porous graphene; after the centrifugal supernatant is dialyzed with a dialysis bag with a molecular weight cut-off of ...

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Abstract

The invention discloses porous graphene, a graphene quantum dot and a green preparation method of the porous graphene and the graphene quantum dot. The green preparation method comprises the following steps of adding a graphite raw material in an acetic acid aqueous solution of chitosan, by taking the chitosan as a release agent, carrying out ultrasonic treatment, centrifuging and precipitating to obtain the porous graphene, and centrifuging and dialyzing supernatant liquor to obtain the graphene quantum dot. The obtained porous graphene not only is less in layer number, but also is larger in transverse size of lamella; the obtained graphene quantum dot not only is good in dispersibility, but also is uniform in particle diameter distribution. Compared with the prior art, since only ultrasonic treatment is used, the preparation method is simple and easy; since graphite is used as the raw material, the graphitization degree of the prepared porous graphene and the prepared graphene quantum dot is high; the obtained porous graphene can be used as a carrier for reverse gene transfection, and the graphene quantum dot can be used for cell imaging.

Description

technical field [0001] The invention belongs to the field of nanotechnology and new material technology, and specifically relates to a porous graphene, graphene quantum dots and a green preparation method thereof. Background technique [0002] Graphene material is a nano-scale graphite material composed of single-layer graphite. Porous graphene is to manufacture some nano-sized holes in graphene sheets by physical or chemical methods. The porous structure makes graphene useful in energy, catalysis or There are great advantages in terms of adsorbent materials. [0003] At present, there are mainly the following methods for the preparation of graphene materials with porous structures: (1) hydrothermal reaction of multilayer graphene and surfactants in strong alkali aqueous solution, but this method is due to the addition of surfactants Many functional groups are introduced into graphene sheets; (2) porous graphene is obtained by simultaneously heating carbon materials such as...

Claims

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Application Information

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IPC IPC(8): C01B31/04C09K11/65B82Y30/00
CPCC09K11/65C01B2204/04C01B2204/32C01P2002/72C01P2004/04C01P2004/64C01P2006/16
Inventor 王小英李晓云孙润仓叶伟杰陈伟敏
Owner SOUTH CHINA UNIV OF TECH
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