Porous MgNiO Chrysanthemum Flower Nanostructure Electrode for Toxic Hg Ion Monitoring in Aquatic Media.

A simple hydrothermal synthesis approach was used to synthesize porous MgNiO Chrysanthemum Flowers (CFs) nanostructures and applied as a sensing electrode for quick detection of hazardous mercury (Hg ions). The morphological, structural, and electrochemical properties of MgNiO CFs were investigated. The morphological characteristic of MgNiO CFs, with a specific surface area of 45.618 m/g, demonstrated strong electrochemical characteristics, including cations in different oxidation states of Ni/Ni. Using a three-electrode system for electrochemical detection, the MgNiO CFs based electrode revealed a good correlation coefficient (R) of ~0.9721, a limit of detection (LOD) of ~11.7 μM, a quick response time (10 s), and a sensitivity of 8.22 μA∙μM∙cm for Hg ions over a broad linear range of 10-100 μM. Moreover, the selectivity for Hg ions in tap water and drinking water was determined, and a promising stability of 25 days by MgNiO CFs electrode was exhibited. The obtained results indicate that the developed MgNiO CFs are a promising electrode for detecting hazardous Hg ions in water and have the potential to be commercialized in the future.