Graphene quantum dot-based pesticide detection method

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...

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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

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