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<p>The sensitivity of developed electrode has gained significant attention for potential energy storage and electrochemical sensor activities. The modified nano-CdO/Ag-CdO-carbon paste electrodes were developed for electrochemical detection of mercury (Hg<sup>+</sup>) heavy metal. The synthesized samples were well characterized through PXRD (Powder X-ray diffraction), SEM-EDAX (Scanning Electron Microscopy-Energy Dispersive X-ray Analysis), XPS (X-ray photo-electron spectroscopy), FT-IR (Fourier transform Infra-Red), and UV-Visible spectroscopy. The Ag-CdO modified electrode endowed with higher sensing current and Csp (188&#xa0;F/g) than pure CdO NPs (94.6&#xa0;F/g) measured by Linear Sweep (LS), Cyclic Voltammetric (CV) and Electrochemical Impedance Spectral (EIS) techniques. The excellent electrochemical sensing action of developed Ag-CdO electrode was examined on heavy metal Hg<sup>+</sup> ions at 1–5 mM scan rate in 0.1&#xa0;M KCl. The linear relationship of sensing measurements with smaller concentration (1–5 mM) was observed with its increased current (+ 1.64 × 10<sup>–4</sup> A/cm<sup>2</sup> at 1 mM) at 30 mV/s. LOD of CdO and Ag-CdO electrodes (Hg<sup>+</sup> <sub>Oxid</sub>) were found at 1.91 mM &amp; 2.41 mM (Hg<sup>+</sup> <sub>Red</sub>) respectively with maximum sensitivity at -0.006&#xa0;V. LOQ of CdO and Ag-CdO electrodes (Hg<sup>+</sup> <sub>Oxid</sub>) were 5.78 mM &amp; 6.98 mM respectively with maximum sensitivity at -0.006&#xa0;V. The antibacterial measurements of prepared samples were examined for their susceptibility to inhibit the growth of gram-negative (<i>Escherichia coli)</i> and gram-positive (<i>Staphylococcus aureus)</i> bacteria. Thus, the synthesized Ag-CdO electrode provides a new insight for determining the concentrations of critical pollutants and processing the various nanoparticles for sensing of cyanogenic heavy metals.</p>

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Emerging applications of sustainable modified CdO/Ag-CdO NPs for electrochemical sensitive and selective detection of mercury (Hg+) heavy metal

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月2日

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  • B. S. Surendra,
  • H. N. Sowmya,
  • T. Kiran,
  • M. Bhaskar,
  • Shwetha Rajappa,
  • B. Uma,
  • Syed Khasim,
  • H. C. Ananda Murthy,
  • K. Y. Chan

摘要

The sensitivity of developed electrode has gained significant attention for potential energy storage and electrochemical sensor activities. The modified nano-CdO/Ag-CdO-carbon paste electrodes were developed for electrochemical detection of mercury (Hg+) heavy metal. The synthesized samples were well characterized through PXRD (Powder X-ray diffraction), SEM-EDAX (Scanning Electron Microscopy-Energy Dispersive X-ray Analysis), XPS (X-ray photo-electron spectroscopy), FT-IR (Fourier transform Infra-Red), and UV-Visible spectroscopy. The Ag-CdO modified electrode endowed with higher sensing current and Csp (188 F/g) than pure CdO NPs (94.6 F/g) measured by Linear Sweep (LS), Cyclic Voltammetric (CV) and Electrochemical Impedance Spectral (EIS) techniques. The excellent electrochemical sensing action of developed Ag-CdO electrode was examined on heavy metal Hg+ ions at 1–5 mM scan rate in 0.1 M KCl. The linear relationship of sensing measurements with smaller concentration (1–5 mM) was observed with its increased current (+ 1.64 × 10–4 A/cm2 at 1 mM) at 30 mV/s. LOD of CdO and Ag-CdO electrodes (Hg+ Oxid) were found at 1.91 mM & 2.41 mM (Hg+ Red) respectively with maximum sensitivity at -0.006 V. LOQ of CdO and Ag-CdO electrodes (Hg+ Oxid) were 5.78 mM & 6.98 mM respectively with maximum sensitivity at -0.006 V. The antibacterial measurements of prepared samples were examined for their susceptibility to inhibit the growth of gram-negative (Escherichia coli) and gram-positive (Staphylococcus aureus) bacteria. Thus, the synthesized Ag-CdO electrode provides a new insight for determining the concentrations of critical pollutants and processing the various nanoparticles for sensing of cyanogenic heavy metals.