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.
关键词
离子印迹/电化学传感器/铅离子/选择性/介孔二氧化硅
Key words
Ion imprinting/Electrochemical sensor/Lead ion/Selectivity/Selective ordered mesoporous silica
维普
万方数据