Green Synthesis and Characterization of Sodium Banana Peel Xanthate Carbon Dot (SBPX C-Dot) and Preparation and Utility of Carbon Composite Paste Electrode for Selective Potentiometric Sensing of Hg (II) Ions

A green approach has been used for the synthesis of fluorescent sodium banana peel xanthate Carbon Dot (SBPX C-dot) with the use of yellow banana peels as carbon source. The Carbon Dot were synthesized by hydrothermal treatments. pigments and other low molecular weight hydrocarbons, most of the above materials on reaction with carbon disulphide Banana peel is mostly composed of cellulose (8.4 nmol L-1), pectin (10-21%), hemicellulose (6.4-9.4 %), lignin (6-12%). Banana peel was first treated with 10% NaOH for a day to hydrolyze or digest or disentigrate into the low molecular weight and bigger molecular weight compounds, with a lot of hydroxyl functional groups, which make the Banana peel a potential substrate for the synthesis of Banana Peel Xanthate C-Dot (SBPX C-Dot). The Banana Peel Xanthate C-Dot (SBPX C-Dot) are analyzed and identified by FT-IR, Raman Spectroscopy and UV-Visible spectroscopy. Effect of pH on UV-Visible and Fluorescence Spectroscopy were carried out in the pH range (pH=1-10). Field Emission Scanning Electron Microscopy was used to study the surface morphology. The utility of (SBPX C-Dot) with Carbon Paste to form a Composite Electrode (CCPE) for potentiometric sensing of Hg (II) ion was accomplished in aqueous acetate and chloride medium at different pHs (pH=1-10) . Reasonable and selective sensing was observed with CCPE for Hg (II) ion is observed.