Electrochemical detection of bisphenol B based on poly(Prussian blue)/carboxylated multiwalled carbon nanotubes composite modified electrode

Abstract A simple and highly sensitive electrochemical sensor for the determination of bisphenol B (BPB) based on a glassy carbon electrode (GCE) modified with Prussian blue (PB) and carboxylated multi-walled carbon nanotubes (MWNTs-COOH) was constructed. The PB/MWCNTs-COOH/GCE was characterized by emission scanning electron microscopy, X-ray diffraction, electrochemical impedance spectroscopy, and cyclic voltammetry. Due to the synergistic effect, the PB/MWCNTs-COOH/GCE remarkably enhanced the oxidation of BPB, which improved the anodic peak current of BPB significantly. Under the optimum conditions, the linear response range of BPB was between 5 × 10-8 and 1.75 × 10-4 M with the detection limit (S/N = 3) of 5 × 10-10 M. Additionally, the PB/MWCNTs-COOH/GCE revealed excellent stability, repeatability and reproducibility. Moreover, it was successfully applied in the determination of BPB in real samples. This study provided a sensitive and simple sensor for the quantitative detection of BPB in the environment.