Highly Sensitive Electrochemical Pb(II) Sensors Based on MoS2/rGO Nanocomposites by Square Wave Voltammetry

Currently, heavy metal ion contamination in water is becoming more and more common, especially Pb(II), which is a serious threat to human health. In this experiment, MoS2/rGO nanocomposites were used to modify glassy carbon electrodes and square wave voltammetry(SWV) electrochemical detection method was selected to detect trace Pb(II) in water. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) showed that MoS2 nanoparticles were uniformly distributed on the rGO films. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) showed that MoS2/rGO has higher sensitivity and conductivity. After determining the optimal experimental parameters, the MoS2/rGO modified glassy carbon electrodes exhibited high sensitivity (57.57 mu A mu M-1) and low limit of detection (0.060 mu M) for Pb(II) as well as good interference resistance and stability.