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κ-Carrageenan-derived carbon dots for highly selective and sensitive detection of Fe3+ and oxytetracycline

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Abstract

Carbon dots (CDs) have received increasing attention as fluorescence sensors for the detection of different metal ions and organic small molecules. In this work, κ-carrageenan (κ-Carr)-derived carbon dots (C-CDs) were synthesized via a facile hydrothermal treatment with κ-Carr as a carbon source. The produced C-CDs exhibited a high fluorescence with fluorescent quantum yield up to 20.6% and excellent fluorescent stability under diverse conditions (UV radiation, pH value and ionic strength). Then, the C-CDs were utilized as dual functional sensing probe to detect both Fe3+ and oxytetracycline (Otc). The fluorescence intensity of C-CDs was selectively quenched by Fe3+, in sharp contrast to dozens of other metal ions like Al3+, Ba2+, Ca2+, Co2+, Mg2+, Pb2+, Na+, Hg2+, Ni2+, Zn2+, Cd2+ and Cu2+. Coincidentally, this fluorescence could also be selectively quenched by Otc, entirely distinct from related physiological molecules like glycine, ammonium hydroxide, glucose, urea. The prepared C-CDs could be used for label-free sensitive and selective fluorescent detector for Fe3+ in a wide concentration range of 0–500 μM with a detection limit of 0.21 μM and for Otc as well in the range of 0–100 µM with a detection limit of 0.05 µM. Moreover, the fluorescent C-CDs were successfully used for Fe3+ and Otc detection in some real samples, suggesting great application potential in fluorescence sensing of trace metal elements and antibiotics.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (Nos. 51503110, 51773102).

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Correspondence to Xihui Zhao.

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Wang, Y., Liu, Y., Zhao, L. et al. κ-Carrageenan-derived carbon dots for highly selective and sensitive detection of Fe3+ and oxytetracycline. J Mater Sci 56, 1272–1285 (2021). https://doi.org/10.1007/s10853-020-05301-2

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