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<p>This work presents a green synthesis of gold nanoparticles (AuNPs) using an aqueous extract of fresh <i>Satureja macrostema</i> leaves and their application in the electrooxidation of glycerol. The nanoparticles were characterized by ultraviolet–visible spectroscopy (UV–Vis), X-Ray diffraction (XRD), photoluminescence (PL), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). TEM and SEM reveal semispherical AuNPs with an average size of 22&#xa0;nm. XRD confirms the face-centered cubic (FCC) structure. The electrocatalytic activity was evaluated by cyclic voltammetry in acidic (0.5&#xa0;M H<sub>2</sub>SO<sub>4</sub>) and basic (2&#xa0;M KOH) media. Under alkaline conditions, AuNPs showed a marked enhancement in current density during glycerol electrooxidation, achieving 12-fold and 5.3-fold increases with analytical and crude glycerol, respectively. These results demonstrate the potential of <i>S. macrostema</i> to synthesize AuNPs for sustainable biomass valorization.</p> Graphical abstract <p></p>

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Glycerol oxidation using gold nanoparticles by green reduction using Satureja macrostema

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • M. Frutis-Murillo,
  • I. Velázquez-Hernández,
  • L. G. García,
  • R. Esparza,
  • J. E. López-Meza,
  • G. Rosas

摘要

This work presents a green synthesis of gold nanoparticles (AuNPs) using an aqueous extract of fresh Satureja macrostema leaves and their application in the electrooxidation of glycerol. The nanoparticles were characterized by ultraviolet–visible spectroscopy (UV–Vis), X-Ray diffraction (XRD), photoluminescence (PL), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). TEM and SEM reveal semispherical AuNPs with an average size of 22 nm. XRD confirms the face-centered cubic (FCC) structure. The electrocatalytic activity was evaluated by cyclic voltammetry in acidic (0.5 M H2SO4) and basic (2 M KOH) media. Under alkaline conditions, AuNPs showed a marked enhancement in current density during glycerol electrooxidation, achieving 12-fold and 5.3-fold increases with analytical and crude glycerol, respectively. These results demonstrate the potential of S. macrostema to synthesize AuNPs for sustainable biomass valorization.

Graphical abstract