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<p>Silver nanoparticle-decorated graphitic carbon nitride nanosheets (AgCN) were successfully synthesized through a simple one-pot plant extract-assisted in situ reduction strategy and evaluated for the photocatalytic degradation of methyl violet (MV) under sunlight irradiation. The successful formation of Ag nanoparticles on g-C<sub>3</sub>N<sub>4</sub> nanosheets was confirmed by XRD, SEM, XPS, and ICP-OES analyses, while UV–Vis diffuse reflectance spectroscopy and photoluminescence measurements revealed enhanced visible-light absorption and suppressed charge-carrier recombination after Ag loading. The photocatalytic degradation kinetics were systematically investigated using a pseudo-first-order kinetic model. Among the prepared photocatalysts, AgCN-10 exhibited the highest activity with an apparent rate constant of 17.2 ± 0.7 × 10⁻<sup>3</sup>&#xa0;min⁻<sup>1</sup>, approximately 6.1 times higher than that of pristine g-C<sub>3</sub>N<sub>4</sub> nanosheets (2.8 ± 0.1 × 10⁻<sup>3</sup>&#xa0;min⁻<sup>1</sup>). The effects of catalyst dosage and initial dye concentration were also investigated, revealing optimum degradation at a catalyst loading of 0.50&#xa0;mg/mL. Band position analysis together with radical scavenging experiments demonstrated that superoxide radicals (∙O₂⁻) are the dominant reactive species responsible for MV degradation. The AgCN-10 photocatalyst retained approximately 85% of its initial activity after five consecutive cycles, while FTIR and ICP-OES analyses confirmed good structural stability with only 4.6% Ag loss after recycling. Furthermore, the photocatalyst maintained over 90% MV degradation efficiency in tap water, pond water, and lake water, demonstrating its potential applicability under realistic environmental conditions.</p>

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Synthesis of Ag nanoparticles-decorated g-C3N4 nanosheets for the photocatalytic degradation of methyl violet

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Venkatramulu Gopi,
  • G. Bhagavanth Reddy,
  • K. Ramesh,
  • R. Swathi,
  • M. Jaipal Reddy

摘要

Silver nanoparticle-decorated graphitic carbon nitride nanosheets (AgCN) were successfully synthesized through a simple one-pot plant extract-assisted in situ reduction strategy and evaluated for the photocatalytic degradation of methyl violet (MV) under sunlight irradiation. The successful formation of Ag nanoparticles on g-C3N4 nanosheets was confirmed by XRD, SEM, XPS, and ICP-OES analyses, while UV–Vis diffuse reflectance spectroscopy and photoluminescence measurements revealed enhanced visible-light absorption and suppressed charge-carrier recombination after Ag loading. The photocatalytic degradation kinetics were systematically investigated using a pseudo-first-order kinetic model. Among the prepared photocatalysts, AgCN-10 exhibited the highest activity with an apparent rate constant of 17.2 ± 0.7 × 10⁻3 min⁻1, approximately 6.1 times higher than that of pristine g-C3N4 nanosheets (2.8 ± 0.1 × 10⁻3 min⁻1). The effects of catalyst dosage and initial dye concentration were also investigated, revealing optimum degradation at a catalyst loading of 0.50 mg/mL. Band position analysis together with radical scavenging experiments demonstrated that superoxide radicals (∙O₂⁻) are the dominant reactive species responsible for MV degradation. The AgCN-10 photocatalyst retained approximately 85% of its initial activity after five consecutive cycles, while FTIR and ICP-OES analyses confirmed good structural stability with only 4.6% Ag loss after recycling. Furthermore, the photocatalyst maintained over 90% MV degradation efficiency in tap water, pond water, and lake water, demonstrating its potential applicability under realistic environmental conditions.