Enzyme free electrochemical determination of bisphenol A using screen-printed electrode modified by graphdiyne and carbon nanotubes

Graphdiyne (GDY) was synthesized and for the first time blended with carboxylated multi-walled carbon nanotubes (cMWCNTs) to modify screen-printed electrode (SPE). Electrochemical response of bisphenol A (BPA) at the as-proposed electrode was studied. And the significant reduction of oxidation peak potential and enhancement of peak current were recorded, showing excellent performance for the determination of BPA. The pH of supporting electrolyte, proportion of GDY and cMWCNTs, and modification amount were optimized. At the optimal conditions, BPA was determined by linear sweep voltammetry with the linear concentration ranging from 0.2 μM to 500 μM and the estimated detection limit being 0.013 μM (S/N = 3). This sensor also showed good performance in BPA measurement of the lake water and tissue samples.