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<p>Zinc sulfide (ZnS) is a semiconductor with a bandgap of 3.54&#xa0;eV (blende) and 3.92&#xa0;eV (wurtzite). Despite its promising potential for photocatalytic applications, its practical use has been limited by its wide bandgap. This work proposes to improve the photocatalytic efficiency of ZnS by interacting it with silver (Ag) nanoparticles using the biosynthesis method with <i>Camellia sinensis</i> (CS). The results revealed the formation of quasi-spherical ZnS (~ 5&#xa0;nm) and Ag (~ 28&#xa0;nm) nanoparticles distributed over a CS biomass matrix. Photocatalytic tests toward the degradation of methylene blue (MB) under solar irradiation suggest that the ZnS–Ag–CS system exhibits high intrinsic efficiency associated with the optimization of charge carrier generation, transfer, and utilization; it is attributed to the adsorption of MB by the CS biomolecules and a synergistic effect between the generation of electron–hole pairs in ZnS and the excitation of the surface plasmon resonance (SPR) of Ag NPs.</p> Graphical abstract <p></p>

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ZnS–Ag nanocomposites: Structural characterization and photocatalytic performance in methylene blue degradation

  • 期刊论文

  • 发表日期：

    2026年3月24日

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  • Claudia Jazmín Bahena-Martínez,
  • Nayely Torres-Gómez,
  • Domingo Ixcóatl García-Gutiérrez,
  • Alfredo Rafael Vilchis-Nestor

摘要

Zinc sulfide (ZnS) is a semiconductor with a bandgap of 3.54 eV (blende) and 3.92 eV (wurtzite). Despite its promising potential for photocatalytic applications, its practical use has been limited by its wide bandgap. This work proposes to improve the photocatalytic efficiency of ZnS by interacting it with silver (Ag) nanoparticles using the biosynthesis method with Camellia sinensis (CS). The results revealed the formation of quasi-spherical ZnS (~ 5 nm) and Ag (~ 28 nm) nanoparticles distributed over a CS biomass matrix. Photocatalytic tests toward the degradation of methylene blue (MB) under solar irradiation suggest that the ZnS–Ag–CS system exhibits high intrinsic efficiency associated with the optimization of charge carrier generation, transfer, and utilization; it is attributed to the adsorption of MB by the CS biomolecules and a synergistic effect between the generation of electron–hole pairs in ZnS and the excitation of the surface plasmon resonance (SPR) of Ag NPs.

Graphical abstract