Nanoscale platform based on a graphite mine-based electrode functionalized with 1-pyrene carboxylic acid and reduced graphene oxide and decorated with molybdenum disulfide nanoroses for the detection of hydrazine and p-nitrophenol in water samples

Abstract

The present invention describes the development of a nanometric platform highly sensitive to the presence of two potential water contaminants, hydrazine and p-nitrophenol. This platform is an electrochemical cell containing a graphite mine electrode modified with nanomaterials as the working electrode, a platinum counter electrode, and an Ag / AgCl / Cl (3M) reference electrode. To develop the working electrode for the electrochemical platform, the surface of the graphite electrode was modified with 1-pyrene carboxylic acid and reduced graphene oxide using the droplet deposition technique. Subsequently, the new active surface of the electrode was decorated with molybdenum disulfide (MOS2) nanoroses using the electrodeposition method. The results of the electrochemical study demonstrate the electrocatalytic properties of the nanomaterials used in the platform's development, as well as the strong correlation between current intensity and the concentration of the target analytes. This platform enabled the quantification of the two aforementioned analytes in real water samples with low detection limits of approximately 9.3 and 13.7 nM for hydrazine and p-nitrophenol, respectively.