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<p>The increasing contamination of water resources by persistent organic pollutants and the rise of antibiotic-resistant bacteria necessitate the development of multifunctional and sustainable treatment strategies. Green-engineered nanomaterials have emerged as promising candidates to address these interconnected environmental and biological challenges. This study reports a green and scalable synthesis of Ag-decorated TiO<sub>2</sub> nanostructures via a plant-mediated reduction route, targeting sustainable water treatment and antimicrobial applications. Structural and morphological analyses (XRD, TEM, and FT-IR) confirmed the successful deposition of Ag nanoparticles on the surface of the TiO<sub>2</sub>, yielding quasi-spherical nanostructures with an average particle size of 10–55&#xa0;nm and uniform dispersion. The photocatalytic performance was evaluated through the decolorization of model organic dyes under UV and visible-light irradiation. The Ag-TiO<sub>2</sub> nanostructures achieved decolorization efficiencies of 96.4% for rhodamine B and 91.7% for erythrosine within 110&#xa0;min, demonstrating enhanced charge separation and visible-light responsiveness compared to pristine TiO<sub>2</sub>. Antibacterial activity was systematically assessed against various strains, showing inhibitory effects with minimum inhibitory concentration (MIC) values of 31.5–250&#xa0;µg/mL, attributed to the synergistic effects of plasmonic Ag nanoparticles and reactive oxygen species generation. Additionally, the nanostructures exhibited notable antioxidant activity (~ 80% radical scavenging). Overall, this work highlights a sustainable route for engineering multifunctional nanocatalysts with dual environmental and biomedical relevance, aligning with green chemistry principles and water remediation challenges.</p>

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A Green Synthesis of Ag-TiO2 Nanostructures for Efficient Photocatalytic Degradation of Organic Pollutants and Antibacterial Applications

  • 期刊论文

  • 发表日期：

    2026年7月25日

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  • Fatimah S. Jafar,
  • Baidaa Husain,
  • Kamran Heydaryan,
  • Muatez Mohammed

摘要

The increasing contamination of water resources by persistent organic pollutants and the rise of antibiotic-resistant bacteria necessitate the development of multifunctional and sustainable treatment strategies. Green-engineered nanomaterials have emerged as promising candidates to address these interconnected environmental and biological challenges. This study reports a green and scalable synthesis of Ag-decorated TiO2 nanostructures via a plant-mediated reduction route, targeting sustainable water treatment and antimicrobial applications. Structural and morphological analyses (XRD, TEM, and FT-IR) confirmed the successful deposition of Ag nanoparticles on the surface of the TiO2, yielding quasi-spherical nanostructures with an average particle size of 10–55 nm and uniform dispersion. The photocatalytic performance was evaluated through the decolorization of model organic dyes under UV and visible-light irradiation. The Ag-TiO2 nanostructures achieved decolorization efficiencies of 96.4% for rhodamine B and 91.7% for erythrosine within 110 min, demonstrating enhanced charge separation and visible-light responsiveness compared to pristine TiO2. Antibacterial activity was systematically assessed against various strains, showing inhibitory effects with minimum inhibitory concentration (MIC) values of 31.5–250 µg/mL, attributed to the synergistic effects of plasmonic Ag nanoparticles and reactive oxygen species generation. Additionally, the nanostructures exhibited notable antioxidant activity (~ 80% radical scavenging). Overall, this work highlights a sustainable route for engineering multifunctional nanocatalysts with dual environmental and biomedical relevance, aligning with green chemistry principles and water remediation challenges.