Facile preparation of polydopamine-reduced graphene oxide nanocomposite and its electrochemical application in simultaneous determination of hydroquinone and catechol

A polydopamine (PDA)-reduced graphene oxide (RGO) nanocomposite was prepared by a one-step procedure and was characterized by Fourier transform infrared spectra (FTIR), electrochemical impedance spectra (EIS), and atomic force microscopy (AFM). The characterizations confirm the successful reduction of graphene oxide to RGO in the PDA-RGO nanocomposite. The application of PDA-RGO nanocomposite in simultaneous determination of hydroquinone (HQ) and catechol (CC) was investigated. The ΔEp between HQ and CC was 103 mV, which was wide enough to discriminate the dihydroxybenzene isomers. The peak current of HQ was linear to its concentration in the range of 1.0 × 10−6 to 2.3 × 10−4 M and the peak current of CC was linear to its concentration in the range of 1.0 × 10−6 to 2.5 × 10−4 M.