Green Synthesis of Carbon Dot (CDs) and Sensing of Metal Ion

Carbon dots (CDs) have demonstrated significant promise in the application of ion sensing, water/waste treatment, photo-catalysis, biological imaging, supercapacitor, heavy metal detection, and membrane filtration. In this paper, fluorescent carbon dots (CDs) have been synthesized by solvothermal treatment using fruit waste (apple peel) as a raw material. Ecological solvents such as distilled water and ethanol have been used as solvent to produce CDs. The prepared fluorescent CDs have been characterized by PL spectra, UV–Vis, zeta potential, FTIR, and TEM. Some metal ions like Cr (VI) have human health mutagenic and carcinogenic consequences which can penetrate cells membrane and also lead to DNA mutation. Thus, the green synthesized CDs have been studied for the detection of Cr (VI) ions with detection limit of 3.82 µM.