Simultaneous Electrochemical Determination of Lead and Copper Based on Graphenated Multi-walled Carbon Nanotubes

Abstract

This work presents a fast and sensitive method for simultaneous electrochemical determination of lead and copper based on a graphenated multi-walled carbon nanotubes (G-MWCNT) modified indium tin oxide electrode (ITO). The G-MWCNT was prepared by electrochemical reduction of graphene oxide wrapped multi-walled carbon nanotubes. The modified ITO was characterized by SEM and 3D optical surface profiler Significantly enhanced electrochemical activity was observed in square wave anodic stripping voltammetry compared to that of bare ITO. The G-MWCNT modified ITO showed a wide detection range of lead from 0.05 to 2.5 μM with a limit of detection of 6 nM and copper from 0.05 to 2.5 μM with a limit of detection of 12 nM. Moreover, the proposed sensor exhibited excellent anti-interference property and reproducibility.