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<p>The proposed work aims at toxic copper ion quantification in aqueous media using nanocomposite biosynthesized by halim seed extract. Here, Ag–zinc oxide (H–Ag–ZnO) nanocomposite was prepared by halim-mediated simple co-precipitation method. The crystallinity, morphology, lattice structure, absorption study, and functional bonds were observed by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), ultraviolet (UV)–vis spectroscopy, and Fourier transform infrared spectroscopy (FTIR). The prepared nanosensor was drop casted on a disposable graphite electrode to evaluate its sensing behavior in KCl with ferri/ferrocyanide solution using voltammetry and obtained superior response. The cyclic voltammetry of sensor in ferrocyanide solution showed the oxidation peak in the existence of concentration of Cu<sup>2+</sup> ions with magnified responses at different scan rates. The differential pulse voltammetry (DPV) results were obtained after preconcentration using chrono deposition at − 400&#xa0;mV. The optimum peak was attained at a deposition time of 120&#xa0;s and pH 7.5. The calibration graph from DPV analysis of copper ions yielded a correlation efficient (<i>R</i><sup>2</sup>) = 0.99, detection limit (LOD) of 7.47&#xa0;ppb, and quantification limit (LOQ) of 22.64&#xa0;ppb with a linear range of 10–100&#xa0;ppb.</p>

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Environmentally friendly synthesis of Ag–ZnO nanocomposite-modified graphite electrode for copper ion quantification

  • 期刊论文

  • 发表日期：

    2025年4月21日

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  • K. Vijayalakshmi,
  • S. Radha,
  • K. Muthumeenakshi

摘要

The proposed work aims at toxic copper ion quantification in aqueous media using nanocomposite biosynthesized by halim seed extract. Here, Ag–zinc oxide (H–Ag–ZnO) nanocomposite was prepared by halim-mediated simple co-precipitation method. The crystallinity, morphology, lattice structure, absorption study, and functional bonds were observed by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), ultraviolet (UV)–vis spectroscopy, and Fourier transform infrared spectroscopy (FTIR). The prepared nanosensor was drop casted on a disposable graphite electrode to evaluate its sensing behavior in KCl with ferri/ferrocyanide solution using voltammetry and obtained superior response. The cyclic voltammetry of sensor in ferrocyanide solution showed the oxidation peak in the existence of concentration of Cu2+ ions with magnified responses at different scan rates. The differential pulse voltammetry (DPV) results were obtained after preconcentration using chrono deposition at − 400 mV. The optimum peak was attained at a deposition time of 120 s and pH 7.5. The calibration graph from DPV analysis of copper ions yielded a correlation efficient (R2) = 0.99, detection limit (LOD) of 7.47 ppb, and quantification limit (LOQ) of 22.64 ppb with a linear range of 10–100 ppb.