A Facile Fabricated Electrochemical Sensor Based on Dual−Shell Sn4coo9.3 Microspheres for Simultaneous Detection of Pb2+ and Hg2+

Abstract

The presence of heavy metal ions presents significant health hazards to humans, necessitating an urgent demand for a rapid and efficient detection method. Electrochemical sensing offers a viable approach that enables high sensitivity and selectivity in detecting heavy metal ions. In this study, a novel bimetallic oxide, Sn4CoO9.3, with dual shells and multiple pores was developed by a simple template-free method. The unique dual-shell structure and multiple pores significantly boosts its adsorption capacity for heavy metal ions, the mesoporous pores are beneficial to electrolyte and ions diffusion. A sensor based on Sn4CoO9.3/CS-ERGO with the excellent electroactive property and outstanding absorption capacity was fabricated for the simultaneous detection of different heavy metal ions (Pb2+ and Hg2+). By harnessing the benefits of Sn4CoO9.3 and graphene sheets, the sensors that were created exhibited exceptional sensitivity, stability, and minimal interference when detecting Pb2+ and Hg2+ in real samples. This suggests promising prospects for utilizing the sensor in environmental water quality monitoring applications.

Keywords: Dual-shell bimetallic oxide, Electrochemical Sensor, Lead ions, Mercury ions, Simultaneous detection