Pesticide detection method based on graphene quantum dots

A graphene quantum dot and detection method technology, which is applied in measurement devices, preparation of test samples, material analysis using wave/particle radiation, etc., can solve problems such as unsuitable mass production, low detection accuracy, and difficult separation of impurities. , to achieve the effect of clean edge without heterofunctional groups, high detection accuracy and high purity of finished products

Active Publication Date: 2021-09-03
DONGGUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 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 detect pesticide concentrations, the detection accuracy is low and it is not suitable for large-scale production

Method used

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  • Pesticide detection method based on graphene quantum dots
  • Pesticide detection method based on graphene quantum dots
  • Pesticide detection method based on graphene quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: the preparation of graphene quantum dot

[0035] 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.

[0036] 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.

[0037] 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

[0043] Embodiment 2: Preparation of boron nitride quantum dots

[0044] 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.

[0045] Result analysis:

[0046] 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.

[0047] 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 functi...

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Abstract

The present invention relates to the field of graphene quantum dots, in particular to a method for detecting pesticides based on graphene quantum dots, comprising the following steps: a, preparing graphene quantum dots; b, taking the graphene quantum dots prepared in step a to detect pesticide concentration. Wherein the preparation steps of graphene quantum dots are: 1. mechanically mix graphite powder block with molten salt catalyst; ; 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. The pesticide detection method of the present invention can accurately detect the pesticide concentration and is suitable for large-scale production because of the low cost of the graphene quantum dot preparation method, high degree of graphitization, and good quality of finished products.

Description

technical field [0001] The invention relates to the field of graphene quantum dots, in particular to a method for detecting pesticides based on graphene quantum dots. Background technique [0002] Pesticides are widely used in agricultural production to improve product quality and yield, but the hazards of pesticide residues are becoming increasingly serious. Developed countries have successively established limit standards for pesticide residues in agricultural products. However, most of the agricultural product extracts are mixtures of many different substances, and the content of the target compound to be detected is often very low. Therefore, effective sample pretreatment, including separation, purification and enrichment, is the prerequisite for accurate analysis and identification. [0003] At present, for the analysis of multi-component pesticide residues, the main process is to firstly use techniques such as vibration homogenization and solvent extraction for sample...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N21/65G01N23/20058G01N23/2273
CPCG01N1/28G01N21/65G01N23/20058G01N23/2273
Inventor 孙成华徐勇军
Owner DONGGUAN UNIV OF TECH
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