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Title
A novel chemosensor based on graphitic carbon nitride quantum dotsand potassium ferricyanide chemiluminescence system for Hg(II) iondetection
Type of Research Article
Keywords
Hg(II) ionChemosensorChemiluminescenceGraphitic carbon nitride quantum dotsResponse surface methodology
Abstract
In this research, graphitic carbon nitride quantum dots (g-CNQDs) were prepared by a simple and one-step microwave-assisted approach and characterized by X-ray diffraction, Fourier transform infraredspectroscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. The chemilumi-nescence (CL) emission of the synthesized g-CNQDs induced by K3Fe(CN)6as an oxidant along with the CLmechanism were investigated. Based on the diminishing effect of Hg(II) ion on the g-CNQDs–K3Fe(CN)6CL system, a simple and sensitive chemosensor was constructed for Hg(II) ion detection in aqueous solu-tions. A response surface methodology was used to optimize the experimental parameters affecting theanalytical signal. Under the optimized experimental conditions, the calibration graph was linear in therange of 0.25–10 ng mL−1with a detection limit of 0.08 ng mL–1. The inter-day and intra-day relative stan-dard deviations for six replicate determinations of 4 ng mL–1Hg(II) ion were 3.4% and 2.8%, respectively.The developed method was successfully applied for the selective and sensitive determination of Hg(II) inwater and food samples with recoveries in the range of 95.7–102.8% for the spiked samples. The accuracyof the method was evaluated by analyzing a certified reference material (SRM 1566b).
Researchers Hossein Abdolmohammad-Zadeh (First Researcher)، Elaheh Rahimpour (Second Researcher)