A Molecularly Imprinted Electrochemical Sensor for Determination of Bisphenol A Based on rGO@Pd Composite

KeyWord:bisphenol A  reduced graphene oxide and Pd composite  molecular imprinting technique  electrochemical sensor

Abstract:

      A novel molecularly imprinted electrochemical sensor£¨MIP/rGO@Pd/GCE£© for the determination of bisphenol A£¨BPA£© was prepared by molecular imprinting technique based on reduced graphene oxide£¨rGO£© and Pd composite£¨rGO@Pd£© modified glassy carbon electrode£¨GCE£©.BPA and pyrrole were used as template and monomer,respectively.The electrochemical properties of the molecularly imprinted electrochemical sensor were evaluated by cyclic voltammetry£¨CV£©,differential pulse voltammetry£¨DPV£© and electrochemical impedance spectroscopy£¨EIS£©.The morphologies of the sensor were characterized by scanning electron microscopy£¨SEM£© and Fourier transform infrared spectroscopy£¨FT-IR£©.Under the optimum experimental conditions,the peak current intensity at the modified electrode was linear with BPA in the concentration range of 1ª±0-10ª±0 nmol/L.The limit of detection£¨LOD£© for the sensor was 0ª±1 nmol/L and the correlation coefficient£¨r£© was 0ª±997 7.With high sensitivity,excellent selectivity,long term stability and remarkable reproducibility,this novel molecularly imprinted electrochemical sensor was successfully applied in the determination of BPA in water samples with spiked recoveries of 92ª±1%-108ª±0%£®