High Sensitivity Electrochemical As (III) Sensor Based on Fe(3)O(4)/MoS(2) Nanocomposites

Currently, heavy metal ion pollution in water is becoming more and more common, especially As (III), which is a serious threat to human health. In this experiment, a glassy carbon electrode modified with Fe(3)O(4)/MoS(2) nanocomposites was used to select the square wave voltammetry (SWV) electrochemical detection method for the detection of trace As (III) in water. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) showed that Fe(3)O(4) nanoparticles were uniformly attached to the surface of MoS(2) and were not easily agglomerated. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) showed that Fe(3)O(4)/MoS(2) has higher sensitivity and conductivity. After optimizing the experimental conditions, the Fe(3)O(4)/MoS(2)-modified glassy carbon electrode exhibited high sensitivity (3.67 μA/ppb) and a low detection limit (0.70 ppb), as well as excellent interference resistance and stability for As (III).