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<p>Al, N-doped carbon dots (Al-NCDs) with a 315-nm Stokes shift and 31.4% quantum yield were designed to mitigate autofluorescence interference in complex matrices. DFT calculations coupled with structural studies revealed an Al-pyridinic-N coordination modulated electronic transitions, enabling the unique optical properties. Al-NCDs exhibited high sensitivity and selectivity toward Hg<sup>2+</sup>, enabling a dual-functional Hg<sup>2+</sup> control platform integrating rapid detection and removal<i>.</i> The rapid detection achieved&#xa0;a 0.030 ~ 4.0&#xa0;μmol·L<sup>−1</sup> linear range and 8.0&#xa0;nmol·L<sup>−1</sup> detection limit which was applied to&#xa0;agro-samples and river water with recoveries of 90.0 ~ 116.3%. Moreover, smartphone-based on-site detection (LOD: 0.2&#xa0;μmol·L<sup>−1</sup>, 30 samples/10&#xa0;min) further extends practicality. Crucially, Al-NCDs-embedded nanohydrogels exhibit rapid Hg<sup>2+</sup> removal with capacity of 287.2&#xa0;mg·g<sup>−1</sup>, completing the “detection-remediation” control chain. This dual-functional platform bridges large Stokes-shift sensoring with food safety interventions, providing a prototype for Hg control in complex systems.</p> Graphical Abstract <p></p>

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Dual-functional platform based on 315-nm Stokes shift Al, N-doped carbon dots for Hg2+ onsite detection and removal

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Jinlian Huang,
  • Meimei Liu,
  • Yun Cai,
  • Mengtian Xiong,
  • Zhiquan Wu,
  • Runkun Zhang,
  • Qingsong Chen,
  • Zhiming Huo

摘要

Al, N-doped carbon dots (Al-NCDs) with a 315-nm Stokes shift and 31.4% quantum yield were designed to mitigate autofluorescence interference in complex matrices. DFT calculations coupled with structural studies revealed an Al-pyridinic-N coordination modulated electronic transitions, enabling the unique optical properties. Al-NCDs exhibited high sensitivity and selectivity toward Hg2+, enabling a dual-functional Hg2+ control platform integrating rapid detection and removal. The rapid detection achieved a 0.030 ~ 4.0 μmol·L−1 linear range and 8.0 nmol·L−1 detection limit which was applied to agro-samples and river water with recoveries of 90.0 ~ 116.3%. Moreover, smartphone-based on-site detection (LOD: 0.2 μmol·L−1, 30 samples/10 min) further extends practicality. Crucially, Al-NCDs-embedded nanohydrogels exhibit rapid Hg2+ removal with capacity of 287.2 mg·g−1, completing the “detection-remediation” control chain. This dual-functional platform bridges large Stokes-shift sensoring with food safety interventions, providing a prototype for Hg control in complex systems.

Graphical Abstract