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Method for preparing graphene quantum dot from asphalt

A technology of graphene quantum dots and pitch, which is applied in new preparation fields, can solve problems such as unfavorable large-scale production, difficulty in obtaining precursors, cumbersome preparation process, etc., and achieve the effect of reducing preparation difficulty, good water solubility, and simple processing process

Inactive Publication Date: 2017-01-11
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The precursors of the above methods are mainly graphene oxide, graphene, carbon nanotubes and fullerenes, etc., resulting in the disadvantages of difficult to obtain the precursors of these methods, cumbersome preparation process, and high preparation cost, which is not conducive to large-scale production in the future.

Method used

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  • Method for preparing graphene quantum dot from asphalt
  • Method for preparing graphene quantum dot from asphalt
  • Method for preparing graphene quantum dot from asphalt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 0.5 g NaNO 3 , 4 g KMnO 4 Added to 35 mL concentrated H 2 SO 4 Stirring and mixing for 30 min is worth the oxidant mixed solution. Simultaneously mix 1 g of mesophase pitch powder with 5 mL of concentrated H 2 SO 4 Add them together to a 100 mL three-neck flask and wait for processing.

[0032] After 30 min, the oxidant mixture solution was added dropwise into the three-necked flask at a rate of 60 d / min under an ice-bath environment using an atmospheric separatory funnel, and stirring was started.

[0033] After 35 min, the temperature of the water bath was increased to 35 °C, and the oxidation reaction was continued to stir for 6 h to obtain the product solution.

[0034] Then the reaction solution was poured into 250 mL deionized water, and H 2 o 2 After reaching 400 mL, stir for 24 h to remove unreacted oxidant. The above solution was centrifuged at 10,000 rpm for 5 min to obtain the supernatant and then dialyzed to obtain the graphene quantum dot solution....

Embodiment 2

[0036] Concentrated H 2 SO 4 with H 2 o 2 (30%) were mixed and stirred for 30 min at a volume ratio of 7:3 to obtain a mixed solution of oxidant. At the same time, 1 g of mesophase pitch powder was added to a 100 mL three-neck flask for processing.

[0037] After 30 min, 40 mL of the oxidant mixed solution was added dropwise into the three-necked flask at a rate of 60 d / min under an ice-bath environment using an atmospheric separatory funnel, and stirring was started. React in ice bath for 24 h.

[0038] Then the reaction solution was poured into 300 mL deionized water and stirred for 24 h. The above solution was centrifuged at 10,000 rpm for 5 min to obtain the supernatant and then dialyzed to obtain the graphene quantum dot solution. Its UV absorption and fluorescence emission spectra are shown in Figure 4 with Figure 5 shown.

Embodiment 3

[0040] Mix 1 g of mesophase pitch powder, 30 mL of concentrated H 2 SO 4 and 10 mL concentrated HNO 3 Added into a three-necked flask, stirred and reacted at 85 °C for 24 h.

[0041] Then the reaction solution was poured into 250 mL deionized water, and H 2 o 2 After reaching 400 mL, stir for 24 h to remove unreacted oxidant. The above solution was centrifuged at 10,000 rpm for 5 min to obtain the supernatant and then dialyzed to obtain the graphene quantum dot solution.

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Abstract

The invention relates to a new method for preparing a graphene quantum dot from asphalt, coke and other asphalt materials through oxidation and post-treatment process, and belongs to the technical field of nano-material preparation.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanometer materials, and relates to a new preparation method of graphene quantum dots, which uses asphalt materials such as pitch and coke as raw materials, undergoes processes such as oxidation and post-treatment. Background technique [0002] In the 1960s, J. D. Brooks and G. H. Taylor first discovered anisotropic globular and massive mesophases when observing isotropic petroleum coke under a polarizing microscope [Brooks J D, et al. Carbon 1965;3(2):185 -193]. Bitumen is a dark brown complex mixture composed of different molecular weight hydrocarbons and their non-metallic derivatives, which contains a large number of polycyclic aromatic hydrocarbons and condensed ring aromatic hydrocarbons. It can be used as an ideal precursor for preparing graphene quantum dots. Mesophase pitch refers to the disc-shaped polycyclic aromatic hydrocarbons with large molecular weight formed by a series o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 宋怀河赵泽宇张苏董玥陈晓红周继生
Owner BEIJING UNIV OF CHEM TECH
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