Development Of Several Pesticide Molecularly Imprinted Voltammetric Sensors

The use of pesticides has increased crop yields and played an important role in increasing food yields and solving the problem of human food and clothing.At the same time,pesticide residues pose a potential threat to human health.Therefore,the development of simple and rapid pesticide residue detection methods has certain value.In this paper,several pesticide molecularly imprinted voltammetric sensors have been obtained through nanomaterials,molecular imprinting technology and electrochemical analysis technology.The main research work is as follows:1.A thiamethoxam molecularly imprinted voltammetric sensor was developed.Using multi-walled carbon nanotubes and gold nanoparticles as modified materials,thiamethoxam(TMX)pesticide molecules as imprinted molecules,and p-mercaptoaniline as functional group modification monomers.Using electrochemical technology,photochemical technology,scanning electron microscope and other means,the performance of the sensor was optimized.Finally,the sensor was used to detect the TMX in the actual sample of green jujube,and the data obtained was relatively satisfactory,indicating that the prepared sensor can be used for the determination of thiamethoxam in the actual sample.2.Gold nanoparticles and multi-walled carbon nanotubes treated with polyethyleneimine are used as modified materials,imidacloprid(IMI)pesticide molecules are used as imprinting molecules,and two monomers,4-aminothiophenol and o-phenylenediamine,are used as functional group modifiers.Developed an imidacloprid molecularly imprinted voltammetric sensor.Using electrochemical technology,photochemical technology and scanning electron microscope and other means,the relevant performance of this sensor is analyzed.Finally,the sensor was used to detect the IMI in the actual sample tomato,and the analyzed and measured data was good,indicating that the prepared sensor can be used for the determination of imidacloprid in the actual sample.3.Gold nanoparticles,platinum nanoparticles and multi-walled carbon nanotubes treated with polyethyleneimine were used as modified materials,2,4-dichlorophenoxyacetic acid was used as imprinting molecules,and mercaptoaniline and o-phenylenediamine were used as functional group modifications.A 2,4-dichlorophenoxyacetic acid molecularly imprinted voltammetric sensor was developed.Using electrochemical technology,photochemical technology and scanning electron microscope and other means,the relevant performance of 2,4-dichlorophenoxyacetic acid imprinted sensor was explored.Finally,the sensor was used to detect the 2,4-dichlorophenoxyacetic acid in the actual sample cucumber,and good data analysis results were obtained,indicating that the prepared sensor can be used for the determination of 2,4-dichlorophenoxyacetic acid in the actual sample.