Graphene quantum dot-based pesticide detection method

A technology of graphene quantum dots and detection method, 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, difficult separation of impurities, and low detection accuracy. , to achieve the effect of clean edge without heterofunctional groups, high purity of finished product, and high detection accuracy

Active Publication Date: 2019-02-12
DONGGUAN UNIV OF TECH
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  • Abstract
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  • 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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  • Graphene quantum dot-based pesticide detection method

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Experimental program
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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 invention relates to the field of graphene quantum dots, in particular to a graphene quantum dot-based pesticide detection method. The method comprises the following steps of: a, preparing graphene quantum dots; and b, detecting the concentration of a pesticide by the quantum dots prepared in the step a. The preparation of the graphene quantum dots comprises the steps of: (1) mechanically mixing graphene blocks with a fused salt catalyst; (2) preheating the mixture in the step (1) and preserving the heat; (3) directly heating the heat preserved mixture in the step (2) and preserving the heat; (4) cooling the mixture in the step (3) to room temperature, and soaking the mixture in water to obtain suspension; and (5) carrying out centrifugal filtration on the suspension in the step (4) toobtain graphene quantum dots. The preparation method of the graphene quantum dots is low in cost, high in graphitization degree and good in finished product quality, so that the pesticide detection method is capable of accurately detecting the concentrations of pesticides and is suitable for large-scale production.

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 Applications(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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