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<p>Detecting cyanide ions (CN<sup>−</sup>) rapidly and accurately in water is important due to their high toxicity and environmental impact. In this study, we developed a polydopamine stabilized silver nanoparticles (PDA-AgNPs) as a colorimetric probe for the rapid, simple, sensitive and selective determination of CN<sup>−</sup> ions. The PDA-AgNPs were synthesized and characterized using UV-Vis, TEM, XRD, FT-IR, DLS and Zeta potential measurements. On successive additions of CN<sup>−</sup> ions, the surface plasmon resonance (SPR) band of PDA-AgNPs at 392&#xa0;nm was progressively decreased, accompanied by a visible color change from yellow to colorless. This response was attributed to the formation of [Ag(CN)<sub>2</sub>]<sup>−</sup> complexes in the presence of oxygen. The method demonstrated a limit of detection to be 0.12 µM. This colorimetric method exhibited an excellent selectivity towards CN<sup>−</sup> ions detection, over other common interference ions. Further, the proposed assay proved reliable and applicable for real water samples with acceptable recovery percentages. Moreover, to enhance the practical applicability, a smartphone-based detection platform was developed for on-site CN<sup>−</sup> ion monitoring.</p>

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Highly Selective Colorimetric Sensor for Cyanide Ions in Water Samples Using Polydopamine-Stabilized Silver Nanoparticles

  • 期刊论文

  • 发表日期：

    2025年7月12日

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  • Karuppasamy Nandhini,
  • Velmurugan Indhuja,
  • Mani Arivazhagan,
  • Krishnamoorthy Shanmugaraj,
  • M. P. Pachamuthu,
  • Ramalinga Viswanathan Mangalaraja,
  • Malaichamy Ilanchelian

摘要

Detecting cyanide ions (CN−) rapidly and accurately in water is important due to their high toxicity and environmental impact. In this study, we developed a polydopamine stabilized silver nanoparticles (PDA-AgNPs) as a colorimetric probe for the rapid, simple, sensitive and selective determination of CN− ions. The PDA-AgNPs were synthesized and characterized using UV-Vis, TEM, XRD, FT-IR, DLS and Zeta potential measurements. On successive additions of CN− ions, the surface plasmon resonance (SPR) band of PDA-AgNPs at 392 nm was progressively decreased, accompanied by a visible color change from yellow to colorless. This response was attributed to the formation of [Ag(CN)2]− complexes in the presence of oxygen. The method demonstrated a limit of detection to be 0.12 µM. This colorimetric method exhibited an excellent selectivity towards CN− ions detection, over other common interference ions. Further, the proposed assay proved reliable and applicable for real water samples with acceptable recovery percentages. Moreover, to enhance the practical applicability, a smartphone-based detection platform was developed for on-site CN− ion monitoring.