Preparation and Performance Research of Lead Ion Imprinted Electrochemical Sensor for the Detection
Heavy metals are of widespread concern due to their high toxicity,carcinogenicity,and potential for bioaccumulation,which contribute to environmental issues.To precisely monitor heavy metal pollution in the environment,this study leverages the advantages of electrochemical analysis and ion imprinting technology to develop a highly sensitive electrochemical sensor for lead ions.Utilizing lead ion as template molecule and 3-(γ-aminopropyl)trimethoxysilane as the functional monomer,an ion-imprinted polymer was synthesized on a mesoporous silica substrate through a co-condensation method and integrated as the key recognition element of the electrochemical sensor.By meticulously tuning the composition of the carbon paste electrode,a series of ion-imprinted electrochemical sensors with exceptional selectivity were prepared and their electrochemical behavior were thoroughly evaluated.The test results demonstrate that the fabricated sensors offer a linear detection range for lead ion from 10-9 to 10-6 mol/L,with a detection limit reaching 1.3x10-11 mol/L(signal-to-noise ratio=3).In the detection of real samples such as river water and rice,the sensors exhibited high sensitivity(relative standard deviation of 2.5％～7.4％)and high accuracy(recovery rates of 98.8％～102.9％),indicating their significant potential for application in environmental monitoring and food safety detection.
Ion imprintingElectrochemical sensorLead ionSelectivitySelective ordered mesoporous silica
万方数据
维普
