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Macro method of coal-based graphene quantum dot

A graphene quantum dot, macro-quantity technology, applied in the macro-scale field of coal-based graphene quantum dots, can solve the problems of complex experimental process, difficult industrial mass production, and low yield, and achieve good water solubility and high yield , The effect of simple process

Inactive Publication Date: 2014-05-21
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the GQDs will be oxidized during the preparation of GQDs by this mixed acid long-term oxidation reflux method, which will reduce the yield; Difficult to carry out industrial mass production

Method used

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  • Macro method of coal-based graphene quantum dot
  • Macro method of coal-based graphene quantum dot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The present embodiment relates to a macroscopic method of coal-based graphene quantum dots, comprising the following steps:

[0020] Such as figure 1 As shown, mix 0.1g of anthracite coal powder with a size of 200μm, 20ml of N-methyl-2-pyrrolidone and 0.2g of trisodium citrate in a beaker and disperse in an ultrasonic pool for 30min (power 100W); then transfer the mixture into React in a 50ml hydrothermal reactor at 200°C for 8 hours under continuous magnetic stirring conditions, and after cooling, centrifuge at 14,000 rpm for 10 minutes to remove large particles to obtain water-soluble graphene quantum dots. Its UV-Vis absorption spectrum is as follows figure 2 shown.

Embodiment 2

[0022] The present embodiment relates to a macroscopic method of coal-based graphene quantum dots, comprising the following steps:

[0023] Such as figure 1 As shown, mix 0.2g of 100μm lignite powder, 60ml dimethyl sulfoxide and 0.6g sodium tartrate in a beaker and disperse in an ultrasonic pool for 30min (power 200W); then transfer the mixture into a 100ml hydrothermal reaction kettle React at 200°C for 10 h under continuous magnetic stirring conditions, and centrifuge at 13,000 rpm for 20 min after cooling to remove large particles to obtain water-soluble graphene quantum dots. Its UV-Vis absorption spectrum is as follows figure 2 shown.

Embodiment 3

[0025] The present embodiment relates to a macroscopic method of coal-based graphene quantum dots, comprising the following steps:

[0026] Such as figure 1 As shown, mix 0.1g of anthracite powder of 0.1μm size, 30ml of N-methyl-2-pyrrolidone and 0.0g of trisodium citrate in a beaker and disperse in an ultrasonic pool for 10min (power 200W); then turn the mixture to Put it into a 50ml hydrothermal reaction kettle and react at 200°C for 2h under continuous magnetic stirring conditions. After cooling, centrifuge at 14000rpm for 2min to remove large particles to obtain water-soluble graphene quantum dots. Its UV-Vis absorption spectrum is as follows figure 2 shown.

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Abstract

The invention relates to a macro method of a coal-based graphene quantum dot. The macro method comprises the following steps: mixing crushed coal dust with a peeling solvent and a peeling accelerant, performing ultrasonic dispersion, subsequently transferring into a high-pressure reaction kettle and performing hydrothermal reaction under the continuous magnetic stirring action, cooling down, and performing centrifugal separation to remove unpeeled large grains so as to obtain the graphene quantum dot. According to the macro method, macro preparation of the graphene quantum dot is achieved by controlling parameters including the ratio of the coal dust to the peeling solvent and the peeling accelerant, the hydrothermal reaction temperature and the time; compared with the prior art, the coal-based graphene quantum dot not only has the advantages of good water solubility and high fluorescence efficiency as the organic solvent is adopted to directly peel off coal to prepare the graphene quantum dot, but also is low in preparation cost, simple in process, high in productivity and convenient for industrial volume production.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a macro method of coal-based graphene quantum dots. Background technique [0002] Graphene quantum dots (Graphene quantum dots, GQDs) as a quasi-zero-dimensional graphene material, in addition to the unique electron transport properties of graphene and the chemical inertness, low toxicity, and good biocompatibility of carbon quantum dots In addition to properties such as anti-photobleaching, it also has many new properties caused by quantum confinement and boundary effects: (1) GQDs have bandgap structures and photoluminescent properties related to their size and surface groups; (2) GQDs It has wavelength up-conversion characteristics, that is, GQDs can effectively capture low-energy photons in the near-infrared region, and can achieve broadband absorption of sunlight; (3) hot carriers in GQDs have a low relaxation rate, which It means that GQDs can capture hot ...

Claims

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Application Information

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IPC IPC(8): C01B31/04C09K11/65C01B32/19
Inventor 苏言杰张亚非
Owner SHANGHAI JIAO TONG UNIV
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