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Dopamine Functionalized S,N Co-doped Carbon Dots as a Fluorescent Sensor for the Selective Detection of Fe3+ and Fe2+ in Water

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Abstract

In current work, novel functionalized carbon dots have been designed and synthesized by covalently linking dopamine to the surface of S,N co-doped carbon dots (DA-S,N-CDs) for the selective detection of Fe3+ and Fe2+ in water. The as-synthesized DA-S,N-CDs emit blue fluorescence peaked at 470 nm and exhibit excitation-dependent tunable emissions. The tolerance towards pH, salt, and UV irradiation of synthesized carbon dots reveals excellent stability. Upon exposure to Fe3+ or Fe2+, the fluorescence of DA-S,N-CDs was selectively quenched, while other competitive cations did not change significantly. Under the optimal experimental conditions, the fluorescence intensity of DA-S,N-CDs showed a good linear relationship with the concentrations of Fe3+and Fe2+ (5–200 μM for Fe3+ and 5–300 μM for Fe2+), and the limit of detection was 2.86 and 2.06 μM, respectively. Furthermore, considering the excellent stability and anti-interference, DA-S,N-CDs have been successfully used for the detection of Fe3+ and Fe2+ in environmental water.

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Acknowledgements

The authors are grateful to Prof. Xihui Bian for help in revising this paper. This work was supported by Tianjin Key Science and Technology Program Foundation (19PTZWHZ00030, 19YFZCSF01110, 19YFSLQY00060).

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Authors and Affiliations

  1. State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin, 300387, People’s Republic of China

    Siyu Lei, Na Chang, Jimei Zhang & Haitao Wang

  2. School of Chemistry and Chemical Engineering, Tiangong University, Tianjin, 300387, People’s Republic of China

    Siyu Lei, Na Chang & Jimei Zhang

  3. School of Environmental Science and Engineering, Tiangong University, Tianjin, 300387, People’s Republic of China

    Haitao Wang

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  1. Siyu Lei
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  2. Na Chang
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  3. Jimei Zhang
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  4. Haitao Wang
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Correspondence to Jimei Zhang or Haitao Wang.

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Lei, S., Chang, N., Zhang, J. et al. Dopamine Functionalized S,N Co-doped Carbon Dots as a Fluorescent Sensor for the Selective Detection of Fe3+ and Fe2+ in Water. ANAL. SCI. 37, 851–857 (2021). https://doi.org/10.2116/analsci.20P294

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