Cu-MOF/Pd derived oxide nanoparticles based carbon composite - An innovative electrochemical sensing platform for Bisphenol A

Bisphenol A (BPA), an endocrine disrupting chemical, had been used worldwide as a raw material in water bottles and food packages. It leaches into food products and water sources and hence, it should be monitored effectively. Herein, an electrochemical sensing platform based on Cu-MOF@Pd-500 modified glassy carbon (GC) electrode was fabricated for the sensing of BPA. The material was synthesized by a simple solvothermal method, carbonized at 500 ⁰C, and characterized by various surface analytical techniques. Cyclic voltammetric (CV) analysis reveals that the Cu-MOF@Pd-500 modified GCE exhibits 1.5 folds hike in peak current and a considerable shift in peak potential towards the anodic side when compared to Cu-MOF@ 500, suggesting the higher electrocatalytic activity of the former than that of the later. The electrochemical oxidation of BPA provides an irreversible diffusion-controlled process involving two electrons and two protons. Differential pulse voltammetric (DPV) analysis reveals that the constructed sensor material provides a linear response over BPA concentration of 1 − 150 µM with a low detection limit (LOD) of 0.06 µM, (S/N = 3) and amperometric studies deliver a linear range of 1–22 µM with a LOD of 0.025 µM in 0.1 M PBS at a pH 7.0. Additionally, the Cu-MOF@Pd-500 delivers good repeatability, stability, and anti-interference capabilities. The results obtained also support the effectiveness of Cu-MOF@Pd-500 for quantifying and identifying BPA in real sample analysis (plastic water bottles) with an average recovery of the ratio of 101.93 having a relative standard deviation (RSD) of 0.42%.