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<p>This study reports the synthesis of lanthanum vanadate (LaVO<sub>4</sub>) nanoparticles through a green and eco-friendly approach utilizing <i>Colocasia esculenta</i> leaf extract as a bioreducing and stabilizing agent for the first time. The synthesized nanoparticles (NPs) exhibited a monoclinic phase with a P2₁/n space group and good crystallinity, with lattice parameters <i>a</i> = 7.0434, <i>b</i> = 7.2793, and <i>c</i> = 6.7211&#xa0;Å. The presence of phytochemical functional groups from the plant extract, indicating successful capping, was revealed by FTIR spectra. SEM images revealed the spherical morphologies. LaVO<sub>4</sub> NPs exhibited notable photocatalytic activity, achieving 98% degradation of methylene blue (MB) dye within 2&#xa0;h under visible light irradiation with an optimal load of 30&#xa0;mg, owing to their optimal band gap (2.8&#xa0;eV) and surface properties. Additionally, the electrochemical performance of the LaVO<sub>4</sub> was evaluated using cyclic voltammetry (CV) for the detection of paracetamol in aqueous media. The sensor demonstrated excellent electrocatalytic activity, characterized by well-defined redox peaks. The developed LaVO<sub>4</sub>-based sensor, through the CV analysis and chronoamperometry analysis, exhibited sensitivities of 187.25 μA μM⁻<sup>1</sup>&#xa0;cm⁻<sup>2</sup> and 3267.46 μA μM⁻<sup>1</sup>&#xa0;cm⁻<sup>2</sup>, respectively. The LaVO<sub>4</sub>-based sensor using chronoamperometry is a valuable tool for detecting paracetamol at higher sensitivity, while the CV-based sensor can be used as a potential sensor with a very low limit of detection (0.0182&#xa0;μM). This work highlights the potential of green-synthesized LaVO<sub>4</sub> NPs as multifunctional materials for environmental remediation and electrochemical sensing applications.</p> Graphical abstract <p></p>

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Green synthesis of LaVO4 nanoparticles using Colocasia esculenta leaf extract for enhanced photocatalytic activity and electrochemical sensing of paracetamol

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Mallikarjunaswamy Chandrashekaraiah,
  • Lakshmi Ranganatha Venkataravanappa,
  • Soundarya T. Lakshmi Narayan Patel,
  • Pushpa Chikkamulagudu Shivalingaiah,
  • Pooja Kodamballi Ravi Shankar,
  • Nagaraju Ganganagappa,
  • Nagendra Prasad Honnegowdanahalli Shivabasappa,
  • Surendra Boppanahalli Siddegowda

摘要

This study reports the synthesis of lanthanum vanadate (LaVO4) nanoparticles through a green and eco-friendly approach utilizing Colocasia esculenta leaf extract as a bioreducing and stabilizing agent for the first time. The synthesized nanoparticles (NPs) exhibited a monoclinic phase with a P2₁/n space group and good crystallinity, with lattice parameters a = 7.0434, b = 7.2793, and c = 6.7211 Å. The presence of phytochemical functional groups from the plant extract, indicating successful capping, was revealed by FTIR spectra. SEM images revealed the spherical morphologies. LaVO4 NPs exhibited notable photocatalytic activity, achieving 98% degradation of methylene blue (MB) dye within 2 h under visible light irradiation with an optimal load of 30 mg, owing to their optimal band gap (2.8 eV) and surface properties. Additionally, the electrochemical performance of the LaVO4 was evaluated using cyclic voltammetry (CV) for the detection of paracetamol in aqueous media. The sensor demonstrated excellent electrocatalytic activity, characterized by well-defined redox peaks. The developed LaVO4-based sensor, through the CV analysis and chronoamperometry analysis, exhibited sensitivities of 187.25 μA μM⁻1 cm⁻2 and 3267.46 μA μM⁻1 cm⁻2, respectively. The LaVO4-based sensor using chronoamperometry is a valuable tool for detecting paracetamol at higher sensitivity, while the CV-based sensor can be used as a potential sensor with a very low limit of detection (0.0182 μM). This work highlights the potential of green-synthesized LaVO4 NPs as multifunctional materials for environmental remediation and electrochemical sensing applications.

Graphical abstract