Solution pH adjustment method based on graphene quantum dots

A technology of graphene quantum dots and pH adjustment, applied in graphene, chemical instruments and methods, nano-carbon, etc., can solve problems such as unsuitable for large-scale production, difficult to separate impurities, low degree of graphitization, etc., and achieve clean edges without impurities Effects of functional groups, high purity of finished products, and high degree of graphitization

Active Publication Date: 2020-04-10
DONGGUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the bottom-up synthesis, the products often have problems such as low degree of graphitization and difficult separation of impurities. However, in the top-down method, most of them need to use graphene as the material and undergo various cutting treatments, so the cost is high. Products often contain a large number of oxygen-containing photoenergy groups and defects. When used to adjust the pH of a solution, the detection accuracy is low and it is not suitable for large-scale production

Method used

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  • Solution pH adjustment method based on graphene quantum dots
  • Solution pH adjustment method based on graphene quantum dots
  • Solution pH adjustment method based on graphene quantum dots

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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1: the preparation of graphene quantum dot

[0034] The preparation method of graphene quantum dots comprises the following steps: ① take graphite powder block and mechanically mix it with molten salt catalyst; ② take the mixed material in step ①, preheat and keep it warm; ③ take the mixed material in step ② after heat preservation and directly heat up and heat preservation; ④ After cooling the mixture in step ③ to room temperature, soak it in water to obtain the suspension; ⑤ Take the suspension in step ④, and obtain the graphene quantum dot product through centrifugal filtration.

[0035] In step ①, the mass ratio of graphite powder block to molten salt catalyst is 1:2 to 1:8, preferably 1:5 in this embodiment.

[0036] In step ①, the graphite powder block is industrial-grade graphite powder. The ash content of the graphite powder block in this embodiment is not more than 0.05, the moisture content is not higher than 0.02, the carbon content is more than 99...

Embodiment 2

[0042]Embodiment 2: Preparation of boron nitride quantum dots

[0043] The preparation method of boron nitride quantum dots, the raw material is hexagonal boron nitride, and the rest are the same as in embodiment 1.

[0044] Result analysis:

[0045] figure 1 It is the electron micrograph of the raw material graphite powder block and boron nitride, the macroscopic picture of the product solution and the schematic diagram of the reaction.

[0046] Depend on figure 1 It can be seen that the schematic preparation process of graphene quantum dots and boron nitride quantum dots. Diluted GQDS (5mg / ml) is transparent with black particles in suspension. The low water solubility and metallic luster indicate that it has less hydrophilic functional groups, which is totally different from the previously reported carbon quantum dots (CQDS). BNQDs (5mg / ml) are milky white. Both GQDs and BNQDs tend to precipitate and aggregate. This is the result of a small amount of hydrophilic funct...

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Abstract

The invention relates to the field of graphene quantum dots, in particular to a solution acidity-alkalinity regulating method based on a graphene quantum dot. The solution acidity-alkalinity regulating method comprises the following steps: a, preparing the graphene quantum dot; and b, regulating the solution acidity-alkalinity under illumination by the graphene quantum dot prepared in step a. Thegraphene quantum dot is prepared by adopting the following steps: 1, mechanically mixing a graphite powder lump with a molten salt catalyst; 2, performing preheating treatment on the mixture obtainedin step 1 and preserving heat; 3, directly heating the mixture after heat preservation in step 2 and preserving heat; 4, after cooling the mixture obtained in step 3 to the room temperature, performing water soaking treatment to obtain a suspension liquid; and 5, performing centrifugal filtration on the suspension liquid obtained in step 4 to obtain a graphene quantum dot product. The preparationmethod for the graphene quantum dot in a pesticide detection method is low in cost, high in degree of graphitization, and high in finished product quality, and therefore, the solution acidity-alkalinity can be effectively regulated, and the graphene quantum dot is suitable for large-scale production.

Description

technical field [0001] The present invention relates to the field of graphene quantum dots, in particular to a method for adjusting pH of a solution based on graphene quantum dots. Background technique [0002] The adjustment of the pH of the solution is mainly by adding substances containing H+ or OH- ions to neutralize the OH- ions or H+ in the solution to adjust the pH of the solution. This adjustment is irreversible. The innovation of the present invention is that a large amount of hydrogen sulfate is introduced through the edge of the quantum dot. Due to the nanometer size of the quantum dot, the content of the edge atoms is high, and the content of the hydrogen sulfate introduced through the quantum dot is extremely high. At the same time, the size effect of quantum dots leads to the opening of the forbidden band of graphene, which exhibits semiconductor characteristics and has light-absorbing properties. Under the light, photogenerated electrons induce the further i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19
CPCC01B32/19C01B2204/30
Inventor 孙成华徐勇军
Owner DONGGUAN UNIV OF TECH
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