Nanoraspberry-like copper/ reduced graphene oxide as new modifier for simultaneous determination of benzenediols isomers and nitrite.

In this study, immobilized nanoraspberry-like copper on the reduced graphene oxide (NRCu-rGO) was synthesized and used for modification of glassy carbon electrode (GCE) for selective and sensitive simultaneous determination of benzenediols isomers; hydroquinone (HQ), catechol (CC), resorcinol (RS) as well as nitrite (NO2-). A detailed investigation such as field emission scanning electron microscopy, energy dispersive X-ray analysis, and X-ray diffraction as well as electrochemistry methods such as cyclic voltammetry, electrochemical impedance spectroscopy, differential pulse voltammetry (DPVs) and chronoamperometry are performed in order to elucidate the preparation process and properties of the NRCu-rGO/GCE. DPVs peak currents increased linearly with the analytes concentrations within the ranges of 0.13-131.5 μM for HQ, CC, RS and 0.3-131.5 μM for NO2- with a detection limits 49, 52, 60 and 100 nM for HQ, CC, RS and NO2-, respectively. The proposed modified electrode was successfully used for simultaneous determination of HQ, CC, RS and NO2- in real samples.