Fluorescence covalent interaction enhanced sensor for lead ion based on novel graphitic carbon nitride nanocones.

Novel graphitic carbon nitride nanocones (g-CNNCs) were synthesized for the first time in this study. The SEM, TEM, XPS and FT–IR were used to research the structure of the g-CNNCs. We found that the g-CNNCs showed high selective and sensitive for fluorescence enhancement detection of Pb2+ ion via covalent interaction. In addition, the g-CNNCs exhibit stable and specific concentration-dependent fluorescence intensity in the presence of Pb2+ ion in the range of 1–200 μmol·dm−3, and the limit of detection was estimated to be 0.0438 μmol·dm−3 (3S/k). More importantly, the g-CNNCs were used to detect practical samples with satisfactory results. Schematic illustration of graphitic carbon nitride nanocones fluorescence enhanced sensing Pb2+ ion. Unlabelled Image • Graphitic carbon nitride nanocones (g-CNNCs) were synthesized for the first time. • Pb2+ ion can enhance g-CNNCs fluorescence intensity. • g-CNNCs displayed excellent selectivity and sensitivity for lead ion. • g-CNNCs were used to detect lead ion with high accuracy comparing with AAS. [ABSTRACT FROM AUTHOR]