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<p>Developing carbon dots as a fluorescent probe specifically for detecting residual permanganate ion (MnO<sub>4</sub><sup>−</sup> ion) in water is crucial for effective environmental water quality monitoring. In this study, nitrogen-doped carbon dots (N-CDs) were successfully synthesized using purslane as a green precursor and ortho-phenylenediamine (OPD) as a nitrogen source via a simple one-step hydrothermal method. These N-CDs exhibited a maximum emission wavelength of 486&#xa0;nm when excited at 358&#xa0;nm. They demonstrated significant antioxidative properties in various concentrations of H<sub>2</sub>O<sub>2</sub> and showed high photostability and resistance to photobleaching under different pH, ionic strength, and UV irradiation conditions. Furthermore, the N-CDs were validated as highly selective and sensitive fluorescence sensors for MnO<sub>4</sub><sup>−</sup> ion, demonstrating a linear relationship within the concentration range of 0.5–168 uM with a detection limit of 41.8&#xa0;nM. The sensor successfully detected MnO<sub>4</sub><sup>−</sup> ion in spiked tap and river waters, achieving satisfactory recovery.</p>

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Green-precursor carbon dots as effective “off” fluorescence sensors for detecting MnO4− ion in environmental water quality monitoring

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • Xuejiao Jing,
  • Li Song,
  • Changxin Wu

摘要

Developing carbon dots as a fluorescent probe specifically for detecting residual permanganate ion (MnO4− ion) in water is crucial for effective environmental water quality monitoring. In this study, nitrogen-doped carbon dots (N-CDs) were successfully synthesized using purslane as a green precursor and ortho-phenylenediamine (OPD) as a nitrogen source via a simple one-step hydrothermal method. These N-CDs exhibited a maximum emission wavelength of 486 nm when excited at 358 nm. They demonstrated significant antioxidative properties in various concentrations of H2O2 and showed high photostability and resistance to photobleaching under different pH, ionic strength, and UV irradiation conditions. Furthermore, the N-CDs were validated as highly selective and sensitive fluorescence sensors for MnO4− ion, demonstrating a linear relationship within the concentration range of 0.5–168 uM with a detection limit of 41.8 nM. The sensor successfully detected MnO4− ion in spiked tap and river waters, achieving satisfactory recovery.