Lanthanum loaded graphitic carbon nitride nanosheets for highly sensitive and selective fluorescent detection of iron ions
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A facile synthesis of lanthanum (La) loaded graphitic carbon nitride nanosheets (CNNS) was developed in this study. The obtained La-CNNS exhibited an intense emission peak at 255 nm, owing to fluorescence enhancement effect of introduced La on the surface of CNNS. La-CNNS showed excitation-independent behavior and blue shift compared with CNNS. It displayed great fluorescence quenching via photoinduced electron transfer (PET) when a small amount of Fe3+ was added. The probe exhibited a wide linear response concentration range (0.1–20 μM) to Fe3+ with a detection limit of 0.0232 μM. The La-CNNS fluorescence probe was highly selective and suitable for Fe3+ analysis in natural water samples.
Due to cheap equipment, simple operation, fast response and high sensitivity, the fluorescence technology was widely used in detection of iron ions. Graphitic carbon nitride (g-C3N4) is a typical nontoxic, metal-free and organic polymeric semiconductor, which exhibits outstanding physical and chemical properties [6].