研究目的
Developing a Fe3+-selective and sensitive 'on-off' fluorescence probe based on graphitic carbon nitride nanosheets (GCNS) for the determination of Fe3+ ion in aqueous solutions.
研究成果
The GCNS-based fluorescence probe demonstrated high selectivity and sensitivity for Fe3+ detection, with a LOD of 2.06 μM. The fluorescence quenching mechanism was attributed to the redox potential and empty d orbital of Fe3+, providing a clear understanding of the interaction between GCNS and Fe3+.
研究不足
The study does not address the potential interference from complex matrices in real-world samples, and the sensitivity might be affected by the presence of other ions or organic matter.
1：Experimental Design and Method Selection:
The study involved the synthesis of graphitic carbon nitride nanosheets (GCNS) through a green and simple ultrasonic exfoliation method from bulk graphitic carbon nitride (BGCN). The GCNS were then used as a fluorescent probe for Fe3+ detection based on fluorescence quenching.
2：Sample Selection and Data Sources:
BGCN was synthesized by thermal condensation of melamine. GCNS were prepared by exfoliating BGCN under ultrasonic irradiation.
3：List of Experimental Equipment and Materials:
Instruments included XRD (D2 PHASER), SEM (SU-8010), TEM (TF-20), UV-Vis spectrophotometer (UV-3600), and fluorescence spectrometer (J-Y: FL3-211-P). Materials included melamine, Tris-HCl buffer solution, and various metal nitrates.
4：Experimental Procedures and Operational Workflow:
The fluorescence sensing of Fe3+ was performed in tris-HCl buffer solution at room temperature, with fluorescence spectra measured every minute after adding Fe3+ solution.
5：Data Analysis Methods:
The quenching process was analyzed using the Stern-Volmer equation, and the limit of detection (LOD) was calculated.
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