Voltammetric simultaneous quantification of p-nitrophenol and hydrazine by using magnetic spinel FeCo2O4 nanosheets on reduced graphene oxide layers modified with curcumin-stabilized silver nanoparticles

A sensor based on a screen-printed carbon electrode loaded with curcumin-stabilized silver nanoparticle-coated reduced graphene oxide magnetic spinel (FeCo2O4) nanosheets was constructed. The electrocatalytic activity of the electrode enables sensitive simultaneous quantification of hydrazine and p-nitrophenol. The respective working potentials typically are at +0.15V for hydrazine and at -0.75V for p-nitrophenol (both vs. pseudo Ag/AgCl), and the detection limits are 23nM and 18nM (at S/N=3). Good selectivity, repeatability, reproducibility and storage stability are shown. The sensor was used to analyze spiked samples of river water and industrial wastewater.