Electroanalysis of Catechol and Hydroquinone by Glassy Carbon Electrode Modified with Multi-Walled Carbon Nanotubes, β-cyclodextrin Decorated with Reduced Graphene Oxide - Gold Nanoparticle Nanocomposite

Abstract

In this work, the glassy carbon electrode was modified by multi-walled carbon nanotubes, β-cyclodextrin, reduced graphene oxide, and gold nanoparticle nanocomposites GC/MWCNTs/β-CD-rGO@Au). The GC/MWCNTs/β-CD-rGO@Au electrode was utilized for simultaneous monitoring of catechol (CC) and hydroquinone (HQ). The modified electrode has a clear pair of voltammetric peaks for CC and HQ, which makes it an appropriate tool for the simultaneous determination of the two isomers. Under optimized conditions, the oxidation peak currents of CC and HQ at GC/MWCNTs/β-CD-rGO@Au were increased linearly in the 1–173 μM and 2–80 μM concentration range with the limit of detection (LOD) (based on S/N = 3) of 0.17 μM and 0.26 μM. The GC/MWCNTs/β-CD-rGO@Au exhibits adequate stability, repeatability, and recovery in analyzing two dihydroxybenzenes isomers.