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<p>In this study, a fluorescence sensor was developed by grafting N1, N1(anthracene-9,10-diylbis(methylene)bis(2-aminoethyl)ethane-1,2-diamine) (ABED) onto GO-SiO<sub>2</sub>, with the objective of achieving selective detection of metal ions. The fluorescence response of the sensor was systematically evaluated with various metal cations, demonstrating a significantly selective and pronounced emission quenching in the presence of Hg<sup>2</sup>⁺ ion. The operating mechanism of the sensor was identified as static fluorescence quenching, which maintained its specificity even in the presence of competitive ions, including Co<sup>2</sup>⁺, Ni<sup>2</sup>⁺, Zn<sup>2</sup>⁺, Cd<sup>2</sup>⁺, Pb<sup>2</sup>⁺, Na⁺, Mg<sup>2</sup>⁺, Ba<sup>2</sup>⁺, and Mn<sup>2</sup>⁺. Optimal operational conditions were established at a pH of 4, featuring a rapid response time of 30 s. The sensor exhibited a detection limit of 2.2 × 10<sup>–4</sup> M and a linear response range spanning from 2 to 62 × 10<sup>–4</sup> M. This sensor design provides a practical methodology for the selective detection of Hg<sup>2</sup>⁺ ion in complex matrices, including milk and real water samples.</p> Graphical Abstract <p></p>

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A Highly Sensitive Fluorescent Probe Based on Organically Functionalized graphene Oxide-Silica for the Determination of Hg2+ in aqueous Medium

  • 期刊论文

  • 发表日期：

    2025年3月17日

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  • Ali Banitalebi,
  • Ghodsi Mohammadi Ziarani,
  • Alireza Badiei

摘要

In this study, a fluorescence sensor was developed by grafting N1, N1(anthracene-9,10-diylbis(methylene)bis(2-aminoethyl)ethane-1,2-diamine) (ABED) onto GO-SiO2, with the objective of achieving selective detection of metal ions. The fluorescence response of the sensor was systematically evaluated with various metal cations, demonstrating a significantly selective and pronounced emission quenching in the presence of Hg2⁺ ion. The operating mechanism of the sensor was identified as static fluorescence quenching, which maintained its specificity even in the presence of competitive ions, including Co2⁺, Ni2⁺, Zn2⁺, Cd2⁺, Pb2⁺, Na⁺, Mg2⁺, Ba2⁺, and Mn2⁺. Optimal operational conditions were established at a pH of 4, featuring a rapid response time of 30 s. The sensor exhibited a detection limit of 2.2 × 10–4 M and a linear response range spanning from 2 to 62 × 10–4 M. This sensor design provides a practical methodology for the selective detection of Hg2⁺ ion in complex matrices, including milk and real water samples.

Graphical Abstract