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<p>The identification of ClO<sup>−</sup> and iron ions in water medium is a difficult task and has been one of the hot issues in analytical chemistry. For this objective, we synthesized carbon nanoparticles (CNPs) through a solvothermal reaction between 1, 3, 5-trimesic acid and o-phenylenediamine, which served as a sequential fluorescent probe for ClO<sup>−</sup> and Fe<sup>2+</sup> ions. The obtained CNPs were spherical particles with a diameter of 26.5&#xa0;nm, exhibiting excellent fluorescence stability under a wide pH range, high ionic strength, and UV irradiation. Interestingly, the fluorescence of CNPs was selectively enhanced in the presence of ClO<sup>−</sup>, and the resultant enhanced emission was extremely quenched by Fe<sup>2+</sup>. In view of this, a “turn-on-off” fluorescent probe was established, which possessed wonderful sensitivity and selectivity for quantitative analysis of ClO<sup>−</sup> and Fe<sup>2+</sup>, with corresponding detection limits of 0.15 µM and 0.088 µM, respectively. In addition, the practicality and viability of the developed probe were validated by quantifying ClO<sup>−</sup> and Fe<sup>2+</sup> in tap water and river water.</p>

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“Turn-on-off” Fluorescent Probes Based on Carbon Nanoparticles for Hypochlorite and Fe2+ Detection

  • 期刊论文

  • 发表日期：

    2025年1月7日

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  • Minhui Wang,
  • Xuemei Dong,
  • Beibei Guo,
  • Dinghai Wang,
  • Yecang Tang

摘要

The identification of ClO− and iron ions in water medium is a difficult task and has been one of the hot issues in analytical chemistry. For this objective, we synthesized carbon nanoparticles (CNPs) through a solvothermal reaction between 1, 3, 5-trimesic acid and o-phenylenediamine, which served as a sequential fluorescent probe for ClO− and Fe2+ ions. The obtained CNPs were spherical particles with a diameter of 26.5 nm, exhibiting excellent fluorescence stability under a wide pH range, high ionic strength, and UV irradiation. Interestingly, the fluorescence of CNPs was selectively enhanced in the presence of ClO−, and the resultant enhanced emission was extremely quenched by Fe2+. In view of this, a “turn-on-off” fluorescent probe was established, which possessed wonderful sensitivity and selectivity for quantitative analysis of ClO− and Fe2+, with corresponding detection limits of 0.15 µM and 0.088 µM, respectively. In addition, the practicality and viability of the developed probe were validated by quantifying ClO− and Fe2+ in tap water and river water.