Electrochemical Determination of Bisphenol A on a Glassy Carbon Electrode Modified with Gold Nanoparticles Loaded on Reduced Graphene Oxide-multi Walled Carbon Nanotubes Composite

Abstract

Abstract A glassy carbon electrode (GCE) modified with gold nanoparticles loading on the reduced graphene oxide (rGO)-multi-walled carbon nanotubes (MWCNTs) composite film was fabricated by a two-step procedure. Firstly, rGO-MWCNTs composite were prepared by in-situ chemical reduction with hydrazine as a reducing agent. Then, gold nanoparticles (AuNPs) were deposited on the surface of rGO-MWCNTs using simple cyclic voltammetry. This modified electrode was characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and electrochemical methods. Furthermore, the electrochemical behavior of bisphenol A (BPA) was also investigated using this modified electrode. The results showed that the modified electrode had high electrochemical activity for the oxidation of BPA. In 0.10 M phosphate buffer (PBS, pH 7.0), the linear range for the determination of BPA with differential pulse voltammetry (DPV) was in the range of 5.0 × 10−9−1.0 × 10−7 M and 1.0 × 10−7−2.0 × 10−5 M. The detection limit was 1.0 × 10−9 M (S/N = 3). The as-prepared modified electrode was successfully used to determine BPA in river water and the shopping receipt samples with recoveries range of 97%–110% and 98%–104%, respectively.