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<p>The presence of the pharmaceuticals in water as emergent pollutants necessitates a continuous improving of their sensing, e.g., through voltammetric detection with the performance given by electrode composition. In this study, nickel cobaltite (NiCo<sub>2</sub>O<sub>4</sub>) synthesized by the thermolysis was deeply investigated by X-ray diffraction, high-resolution scanning electron microscopy (HR-SEM), and high-resolution transmission electron microscopy coupled with selected area electron diffraction. Also, X-ray photoelectron spectroscopy was used to determine the oxidation state of Ni and Co cations. NiCo<sub>2</sub>O<sub>4</sub> was tested as modifier for commercial glassy carbon (GC) electrode by drop-casting as NiCo<sub>2</sub>O<sub>4</sub>/GC electrode for the voltammetric detection of sodium diclofenac salt (DCF) in water. In our study, the lowest limit of detection of 3&#xa0;nM, better than ones reported in the literature, was achieved for DCF determination using differential pulse voltammetry with the scan rate of 0.05&#xa0;V s<sup>−1</sup>, step potential of 50&#xa0;mV, modulation amplitude of 200&#xa0;mV. The optimized voltammetric detection method was validated by DCF determination in real tap water.</p>

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NiCo2O4 nanoparticles for enhancing voltammetric determination of sodium diclofenac in aqueous solutions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月3日

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  • Luoana Florentina Pascu,
  • Sorina Negrea,
  • Sorina Motoc,
  • Florica Manea,
  • Aniela Pop,
  • Vasile-Adrian Surdu,
  • Bogdan Stefan Vasile,
  • Andreea Mădălina Pandele,
  • Adelina-Carmen Ianculescu,
  • Raluca Dumitru

摘要

The presence of the pharmaceuticals in water as emergent pollutants necessitates a continuous improving of their sensing, e.g., through voltammetric detection with the performance given by electrode composition. In this study, nickel cobaltite (NiCo2O4) synthesized by the thermolysis was deeply investigated by X-ray diffraction, high-resolution scanning electron microscopy (HR-SEM), and high-resolution transmission electron microscopy coupled with selected area electron diffraction. Also, X-ray photoelectron spectroscopy was used to determine the oxidation state of Ni and Co cations. NiCo2O4 was tested as modifier for commercial glassy carbon (GC) electrode by drop-casting as NiCo2O4/GC electrode for the voltammetric detection of sodium diclofenac salt (DCF) in water. In our study, the lowest limit of detection of 3 nM, better than ones reported in the literature, was achieved for DCF determination using differential pulse voltammetry with the scan rate of 0.05 V s−1, step potential of 50 mV, modulation amplitude of 200 mV. The optimized voltammetric detection method was validated by DCF determination in real tap water.