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<p>Metallic nanoparticles are widely recognized for their tunable surface chemistry, catalytic activity, and potential for environmental applications. In this study, gold (Au) and platinum (Pt) nanoparticles were synthesized using sodium citrate, ascorbic acid, and lactic acid as reducing and capping agents to evaluate how these reagents influence their optical properties. UV–vis spectroscopy confirmed a plasmon resonance at 557&#xa0;nm for Au nanoparticles and an absorption peak near 260&#xa0;nm for Pt nanoparticles, consistent with their nanoscale metallic behavior. FTIR analysis confirmed the presence of hydroxyl and carboxylate functional groups, which are responsible for colloidal stability. SEM and HR-TEM imaging showed predominantly spherical morphologies with Au nanoparticles below 100&#xa0;nm and Pt nanoparticles below 20&#xa0;nm in diameter. These findings demonstrate that controlled chemical reduction produces stable nanoparticles with desirable optical characteristics. Future work will integrate these metallic nanoparticles with semiconductor materials to develop hybrid nanocomposites for antibiotic degradation.</p> Graphical abstract <p></p>

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Systematic evaluation of reducing agents in the synthesis and characterization of gold and platinum nanoparticles for photocatalytic applications

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Sonia J. Bailón-Ruiz,
  • Tiffany Miranda-Soto,
  • Sebastian A. Negrón-Nieves

摘要

Metallic nanoparticles are widely recognized for their tunable surface chemistry, catalytic activity, and potential for environmental applications. In this study, gold (Au) and platinum (Pt) nanoparticles were synthesized using sodium citrate, ascorbic acid, and lactic acid as reducing and capping agents to evaluate how these reagents influence their optical properties. UV–vis spectroscopy confirmed a plasmon resonance at 557 nm for Au nanoparticles and an absorption peak near 260 nm for Pt nanoparticles, consistent with their nanoscale metallic behavior. FTIR analysis confirmed the presence of hydroxyl and carboxylate functional groups, which are responsible for colloidal stability. SEM and HR-TEM imaging showed predominantly spherical morphologies with Au nanoparticles below 100 nm and Pt nanoparticles below 20 nm in diameter. These findings demonstrate that controlled chemical reduction produces stable nanoparticles with desirable optical characteristics. Future work will integrate these metallic nanoparticles with semiconductor materials to develop hybrid nanocomposites for antibiotic degradation.

Graphical abstract