Simultaneous Determination of Catechol, Hydroquinone, and Resorcinol on CTAB Functionalized Graphene Oxide/Multiwalled Carbon Nanotube Modified Electrode

Hexadecyl trimethyl ammonium bromide (CTAB) functionalized graphene oxide (CTAB-GO) was synthesized. The composite of CTAB-GO and multi-wall carbon nanotubes (MWNT) was used to modify glassy carbon electrode (GCE). The modified electrode showed excellent electrochemical catalytic activities towards the oxidation of catechol (CT), resorcinol (RS), and hydroquinone (HQ). The oxidation overpotentials of CT, RS, and HQ decreased significantly and the corresponding oxidation currents increased remarkably compared with those obtained at the bare GCE and MWNT modified GCE. Cyclic voltammetry (CV) was used for the simultaneous determination of CT, RS and HQ in their ternary mixture. The calibration curves for CT, HQ and RS were obtained in the range of 1 x 10(-7) to 4 x 10(-4), 1 x 10(-7) to 2 x 10(-4) and 1 x 10(-6) to 1 x 10(-4) mol L-1, respectively. The detection limits were 1 x 10(-8), 3 x 10(-8) and 2 x 10(-7) mol L-1 for CT, HQ and RS, respectively (S/N = 3).