Modified Glassy Carbon Electrode with Galvanized Copper Nanowires by Palladium and Carbon Nanotubes for Speciation of Dihydroxybenzene Isomers

A new modified glassy carbon electrode (GCE) with galvanized copper nanowires by palladium (CuNWs-Pd) and carbon nonotubes (CNTs) has been used for the simultaneous determination of hydroquinone (HQ), catechol (CC) and resorcinol (RS) as water pollutions. The modifier,Pd/CuNWs- CNTs, was characterized by field emission scanning electron microscopy and electrochemistry. Different electrochemical techniques such as cyclic voltammetry, differential pulse voltammetry (DPV) and chronoamperometry were used for the electrochemical study of the proposed modified electrode toward HQ, CC and RS electrooxidation. Based on the experimental results, the calibration are linear with two segmented 1-99 and 99-228 μM for HQ, 1-280 μM for CC and with two segments 1-33 and 33-228 μM for RS. The detection limits were obtained 0.4, 0.6 and 0.8 μM and the diffusion coefficient calculated 6.5×10-5, 1.6×10-5 and 8.5×10-6 cm2 s−1, for the HQ, CC and RS, respectively. Moreover, GCE/Pd/CuNWs-CNTs was successfully used for simultaneous determination of HQ, CC and RS in real samples by DPV technique.