Abstract
Abstract
Mercury (Hg2+) is a toxic heavy metal that can harm the environment and human health. This study introduces an innovative electrochemical sensor for the selective detection of Hg2+ions using square wave voltammetry (SWV). This research aims to develop a highly selective electrochemical sensor for detecting mercury ions by modifying a glassy carbon electrode (GCE) with silver sulphide (Ag2S) nanoparticles. The work intends to enhance the Ag2S modified GCE’s electroactive surface area and improve electron transport, leading to a more pronounced electrochemical response. The Ag2S crystalline structure was characterized by x-ray diffraction (XRD), while Transmission electron microscopy (TEM) confirmed spherical-shaped particles. Electrochemical impedance spectroscopy and cyclic voltammetry were employed to examine the electrochemical profile of the Ag2S nanoparticles, revealing an electroactive surface area of 9.93 cm2 for the modified GCE. The SWV technique demonstrated effective detection of Hg2+ ions with a detection limit of 0.14 nM. The designed sensor was found to demonstrate the qualities of selectivity, repeatability, reproducibility and anti-interference ability. The Ag2S modified GCE exhibited excellent stability and selectivity towards Hg2+ ions in the presence of potential interferents such as Cu2+, Na+, Ca2+, and Zn2+. These results highlight the potential of the Ag2S nanoparticles modified GCE as a robust platform for environmental monitoring of mercury contamination.