An Electrochemical Sensor Based on Graphene-Polypyrrole Nanocomposite for the Specific Detection of Pb (II)

Abstract

An electrochemical sensor for the rapid, selective and sensitive detection of Pb[Formula: see text] was developed using polypyrrole-graphene (PPY-rGO) nanocomposite by electrochemical synthesis. The PPY-rGO-modified electrode possessed a large effective area because of unique 3D porous architectures, and it displayed excellent selectivity for the determination of Pb[Formula: see text]. The response of Pb[Formula: see text] on the nanocomposite-modified electrode was evaluated, and the relevant parameters were optimized by square wave anodic stripping voltammetry (SWASV). The stripping response was highly linear ([Formula: see text]) over a Pb[Formula: see text] concentration range of [Formula: see text][Formula: see text]mol/L to [Formula: see text][Formula: see text]mol/L, with a detection limit of [Formula: see text][Formula: see text]mol/L (3[Formula: see text] method). Furthermore, its applicability was validated for the determination of Pb[Formula: see text] levels using spiked tap water at different concentrations. The polyporous structure, satisfactory reproducibility, long-term stability and simple synthesis endow the PPY-rGO nanocomposite a promising application in the determination of Pb[Formula: see text].