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In this study, a mesoporous carbon (MC) and Nafion composite-modified electrode was prepared via drop-coating a dispersion of MC and Nafion, which was then dried by a lamp. This sensor was used for the sensitive detection of Cd(II) and Pb(II) by square-wave anodic stripping voltammetry (SWASV). The morphologies and electrochemical properties of the modified electrode were characterized by cyclic voltammetry and electrochemical impedance spectroscopy. The MC layer that was formed on top of the glassy carbon electrode (GCE) could remarkably facilitate electron transfer and enlarge the specific surface area of the electrode. The Nafion film effectively increased the adhesion and stability of the MC layer. The obtained electrode exhibited effective stripping performance for the analysis of Cd(II) and Pb(II). Under optimal conditions, a linear response was observed in the range of 5 to 70 μg∙L-1 with a detection limit of 0.05 μg∙L -1 for Cd(II) and 0.13 μg∙L -1 for Pb(II).

A Sensitive Electrochemical Sensor Using a Mesoporous Carbon and Nafion Composite for the Simultaneous Detection of Cadmium and Lead