Simultaneous Determination of Dihydroxybenzene Isomers using Glass Carbon Electrode Modified with 3D CNT-graphene Decorated with Au Nanoparticles

摘要

3D CNT-graphene decorated with Au nanoparticles was modified onto glassy carbon electrode (AuNPs/CNTs/graphene/GCE) surface through casting and subsequent electrodeposition method.Morphological characterization of Au NPs/CNTs/graphene/GCE was performed by scanning electronmicroscopy (SEM), and evenly distributed Au NPs were observed to be anchored onto porous and 3DCNTs/graphene hybrids. The resultant electrode is used as an electrochemical interface forsimultaneous determination of dihydroxybenzene isomers of hydroquinone (HQ), catechol (CC) andresorcinol (RC). Three well-resolved and sensitive peak signals were observed from cyclicvoltammetric results attributing to the unique porous 3D nanostructure and high electrical conductivityof Au NPs/CNTs/graphene. Differential pulse voltammetry was used to perform quantitative detectionof the three isomers. It was found that good performance of Au NPs/CNTs/graphene/GCE fordetection of dihydroxybenzene isomers was obtained, including wide linear range, high sensitivity andselectivity, low detection limit and excellent stability. In addition, the proposed method can besuccessfully used for the determination of dihydroxybenzene isomers in real water samples.