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<p>Addressing the dual challenges of environmental pollution and antibiotic resistance, this study investigates the synthesis and application of biosynthesized aluminum oxide nanoparticles (γ-Al₂O₃ NPs) and aluminum oxide/silver oxide nanocomposite (γ-Al₂O₃/AgO NC) using <i>Ocimum basilicum</i> plant extract. The green synthesis approach yielded stable NPs, characterized by XRD, SEM, TEM, FTIR, and UV–Vis techniques. The γ-Al₂O₃/AgO NC exhibited a band gap energy of 3.4 eV and an average particle size of 35&#xa0;nm, compared to 3.6&#xa0;eV and 30&#xa0;nm for γ-Al<sub>2</sub>O<sub>3</sub> NPs. Zeta potential measurements demonstrated good stability, with values of -24.5&#xa0;mV for γ-Al₂O₃ NPs and − 28.6&#xa0;mV for γ-Al₂O₃/AgO NC. The antimicrobial activity of γ-Al<sub>2</sub>O<sub>3</sub> NPs and γ-Al₂O₃/AgO NC was evaluated against <i>Escherichia coli</i> (<i>E. coli</i>) and <i>Staphylococcus aureus</i> (<i>S. aureus</i>). <i>E. coli</i> exhibited an inhibition zone of 18.0&#xa0;mm, while <i>S. aureus</i> showed a zone of 22.8&#xa0;mm at a concentration of 5&#xa0;µg/mL when treated with γ-Al₂O₃ NPs. Furthermore, using the γ-Al₂O₃/AgO NC, the inhibition zones increased significantly to 27.6&#xa0;mm for <i>E. coli</i> and 23.8&#xa0;mm for <i>S. aureus</i>, indicating enhanced antibacterial efficacy of the nanocomposite. In photocatalytic experiments, γ-Al₂O₃/AgO NC achieved 96.5% degradation of rhodamine B (RhB) dye within 90 min under sunlight, maintaining 93.05% efficiency after five cycles. These results underscore the dual functionality of γ-Al₂O₃/AgO NC as a sustainable material for environmental remediation and biomedical applications.</p> Graphical Abstract <p></p>

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Eco-friendly γ-Al2O3/AgO nanocomposites with potential antibacterial applications and effective photocatalytic degradation of pollutants

  • 期刊论文

  • 发表日期：

    2025年1月7日

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  • Zarah Alqarni

摘要

Addressing the dual challenges of environmental pollution and antibiotic resistance, this study investigates the synthesis and application of biosynthesized aluminum oxide nanoparticles (γ-Al₂O₃ NPs) and aluminum oxide/silver oxide nanocomposite (γ-Al₂O₃/AgO NC) using Ocimum basilicum plant extract. The green synthesis approach yielded stable NPs, characterized by XRD, SEM, TEM, FTIR, and UV–Vis techniques. The γ-Al₂O₃/AgO NC exhibited a band gap energy of 3.4 eV and an average particle size of 35 nm, compared to 3.6 eV and 30 nm for γ-Al2O3 NPs. Zeta potential measurements demonstrated good stability, with values of -24.5 mV for γ-Al₂O₃ NPs and − 28.6 mV for γ-Al₂O₃/AgO NC. The antimicrobial activity of γ-Al2O3 NPs and γ-Al₂O₃/AgO NC was evaluated against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). E. coli exhibited an inhibition zone of 18.0 mm, while S. aureus showed a zone of 22.8 mm at a concentration of 5 µg/mL when treated with γ-Al₂O₃ NPs. Furthermore, using the γ-Al₂O₃/AgO NC, the inhibition zones increased significantly to 27.6 mm for E. coli and 23.8 mm for S. aureus, indicating enhanced antibacterial efficacy of the nanocomposite. In photocatalytic experiments, γ-Al₂O₃/AgO NC achieved 96.5% degradation of rhodamine B (RhB) dye within 90 min under sunlight, maintaining 93.05% efficiency after five cycles. These results underscore the dual functionality of γ-Al₂O₃/AgO NC as a sustainable material for environmental remediation and biomedical applications.

Graphical Abstract