Abstract
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 255nm, 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 (0.1–20μM) to Fe3+ with a detection limit of 0.0232μM. The La-CNNS fluorescence probe was highly selective and suitable for Fe3+ analysis in natural water samples.
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