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<p>Ag-modified Co<sub>3</sub>O<sub>4</sub> nanoparticles (Ag/Co<sub>3</sub>O<sub>4−ẟ</sub>, Ag:0–3) were synthesized via solution combustion using glycine as fuel. The sample with Ag = 0 corresponds to undoped Co<sub>3</sub>O<sub>4</sub>, while increasing Ag content (Ag = 1 to 3) indicates progressive silver incorporation. The structural, morphological, and vibrational properties of the as-prepared materials were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and infrared (IR) spectroscopy. The photocatalytic performance was assessed through the degradation of methylene blue (MB) under visible light irradiation. XRD analysis confirmed the formation of a cubic spinel-type Co<sub>3</sub>O<sub>4</sub> structure for compositions up to Ag = 1, with increasing Ag content leading to enhanced crystallinity and surface metallic silver. The catalyst with composition AgCo<sub>2</sub>O<sub>4</sub> (Ag = 1) exhibited the highest photocatalytic activity, attributed to an increased Co²⁺ content and the presence of finely dispersed metallic Ag, which together promote improved charge separation and surface reactivity.</p>

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Nano-Structured Ag-Modified Co3O4 for Degradation of Methylene Blue: Effect of Ag Content on Physicochemical and Photocatalytic Properties

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Aya Ben Slimen,
  • Hend Najjar,
  • Adel Megriche

摘要

Ag-modified Co3O4 nanoparticles (Ag/Co3O4−ẟ, Ag:0–3) were synthesized via solution combustion using glycine as fuel. The sample with Ag = 0 corresponds to undoped Co3O4, while increasing Ag content (Ag = 1 to 3) indicates progressive silver incorporation. The structural, morphological, and vibrational properties of the as-prepared materials were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and infrared (IR) spectroscopy. The photocatalytic performance was assessed through the degradation of methylene blue (MB) under visible light irradiation. XRD analysis confirmed the formation of a cubic spinel-type Co3O4 structure for compositions up to Ag = 1, with increasing Ag content leading to enhanced crystallinity and surface metallic silver. The catalyst with composition AgCo2O4 (Ag = 1) exhibited the highest photocatalytic activity, attributed to an increased Co²⁺ content and the presence of finely dispersed metallic Ag, which together promote improved charge separation and surface reactivity.