氧化石墨烯/富勒烯复合材料增敏多金属离子印迹电化学传感器

Multiple Metal Ion Imprinted Electrochemical Sensor with Enhanced Sensitivity by Graphene Oxide-C_(60) Composite

制备了一种对Pb(Ⅱ)、Cd(Ⅱ)和Cu(Ⅱ)等多金属离子具有灵敏、选择性响应的新型印迹传感器。以甲基丙烯酸与乙二胺四乙酸分别为功能单体与配体,乙二醇二甲基丙烯酸酯为交联剂制备出多金属离子印迹聚合物。采用滴涂法将离子印迹聚合物均匀地修饰至氧化石墨烯/富勒烯复合材料修饰碳电极表面,成功制备出灵敏的多金属离子印迹电化学传感器。采取循环伏安法、交流阻抗和差分脉冲法等技术对印迹电化学传感器的性能进行表征,结果表明该多金属离子印迹电化学传感器具有良好的选择性。在1. 0×10^(-9)～5. 0×10^(-7)mol/L范围内,该多金属离子印迹电极的响应电流与金属离子浓度呈现良好的线性关系,对Pb(Ⅱ)、Cd(Ⅱ)和Cu(Ⅱ)金属离子的最低检测限分别为5. 0×10^(-10)、5. 0×10^(-10)和1. 0×10^(-10)mol/L。该多金属离子印迹电化学传感器成功用于实际样品中微量Pb(Ⅱ)、Cd(Ⅱ)和Cu(Ⅱ)等金属离子的检测。

A novel multiple-ion imprinted sensor based on graphene oxide/fullerene composite(GO-C60)was developed for simultaneous and selective determination of Pb(Ⅱ),Cd(Ⅱ)and Cu(Ⅱ).The multiple-ion imprinted polymer was prepared with methacrylic acid and edetic acid as the functional monomer and ligand,respectively.The multiple-ion imprinted sensor was prepared by dispensing the imprinted polymer onto the GO-C60 modified carbon electrode surface.The performance of multiple-ion imprinted sensor was investigated using cyclic voltammetry,differential pulse voltammetry and electrochemical impedance spectroscopy in details.Under the optimized conditions,a linear relationship existed between the response currents of the multiple-ion imprinted sensor and the negative logarithm of ion concentrations ranging from 1.0×10-9 mol/L to 5.0×10-7 mol/L with the detection limit of 5.0×10-10,5.0×10-10 and 1.0×10-10 mol/L for Pb(Ⅱ),Cd(Ⅱ)and Cu(Ⅱ),respectively.The multiple-ion imprinted sensor was successfully used for simultaneous detection of trace level Pb(Ⅱ),Cd(Ⅱ)and Cu(Ⅱ)ions in real samples.