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<p>A selective detection strategy is&#xa0; proposed for the determination of residual hypochlorite in drinking water. Flower-like Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>@Ag magnetic nanoparticles can aggregate on a silver film-coated magnetic substrate surface under a magnetic field, enabling the separation and enrichment of the analyte from the sample. 4-Mercaptophenol is functionalized on magnetic nanoparticles enabling quantitative detection of ClO<sup>−</sup> through a “signal off” mechanism. This substrate exhibits high sensitivity, with an analytical enhancement factor calculated using Rhodamine B (RhB) as an example&#xa0;reaching 1.89 × 10<sup>5</sup>, and a detection limit for ClO<sup>−</sup> as low as 0.0125&#xa0;mg/L. The substrate also demonstrates good uniformity, reproducibility, and selectivity. Detection in actual drinking water samples indicates the potential application of this detection strategy in food safety.</p> Graphical Abstract <p></p>

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Magnetic nanoparticle SERS sensor for rapid and selective detection of ClO− in drinking water

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • Liu Wang,
  • Mingli Wang

摘要

A selective detection strategy is  proposed for the determination of residual hypochlorite in drinking water. Flower-like Fe3O4@SiO2@Ag magnetic nanoparticles can aggregate on a silver film-coated magnetic substrate surface under a magnetic field, enabling the separation and enrichment of the analyte from the sample. 4-Mercaptophenol is functionalized on magnetic nanoparticles enabling quantitative detection of ClO− through a “signal off” mechanism. This substrate exhibits high sensitivity, with an analytical enhancement factor calculated using Rhodamine B (RhB) as an example reaching 1.89 × 105, and a detection limit for ClO− as low as 0.0125 mg/L. The substrate also demonstrates good uniformity, reproducibility, and selectivity. Detection in actual drinking water samples indicates the potential application of this detection strategy in food safety.

Graphical Abstract