A Sensitive Electrochemical Sensor Based on Co3O4-CeO2 Composites Modified Glassy Carbon Electrode for the Determination of Bisphenol A

摘要

A novel electrochemical bisphenol A (BPA) sensor based on Co3O4-CeO2 composites modified glassy carbon electrode (Co3O4-CeO2/GCE) was prepared in this study. Co3O4-CeO2 composites were easily prepared by sol-gel combustion method, and their morphology and structure were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The electrochemical behavior of BPA on the modified electrode was investigated by cyclic voltammetry (CV), and an irreversible oxidation peak appeared at 0.598 V (pH=6). Also the effects of scan rate and pH on electron transfer efficiency of electrode were investigated by CV method. In order to reduce background interference and improve sensitivity, the limit of detection (LOD) and BPA of samples were detected by differential pulse voltammetry (DPV). The results showed there is a wide linear range of 0.033 mu M similar to 30.3 mu M with LOD of 0.0048 mu M (S/N=3) for the constructed electrochemical sensor. It was successful used for the determination of BPA in real samples with satisfied results (the recoveries were between 99.2 % and 101.2 %). The fabricated Co3O4-CeO2/GCE-based sensors exhibited excellent electrochemical performance of BPA, so it could provide an alternative platform for the determination of BPA in the environment.