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<p>Photocatalysis using metal-doped nanoparticle systems, such as Ni-doped ZnO, holds significant promise for addressing global challenges in environmental remediation, energy production, and biomedical applications. However, conventional photocatalysts often face limitations such as wide bandgaps, rapid charge recombination, poor reusability, and limited visible-light activity factors that hinder their practical deployment in real-world applications. To overcome these challenges, this study presents a multifunctional graphene oxide–nickel–zinc oxide (GO-Ni-ZnO) nanohybrid system, engineered to improve photocatalytic performance, stability, and antimicrobial efficacy under visible light. The primary objective was to develop and evaluate an electrospun cellulose acetate (CA) membrane embedded with GO-Ni-ZnO nanohybrids, offering a synergistic combination of bandgap narrowing, enhanced charge separation, and high surface area for advanced photocatalytic and antimicrobial applications. The nanohybrid membranes were synthesized using Sol-gel method followed by electrospinning and characterized via FTIR, Raman spectroscopy, SEM, XRD, and UV–Vis diffuse reflectance spectroscopy. The most effective composition 4% GO + 5% Ni-ZnO achieved a photocatalytic degradation efficiency of 93.41% for methylene blue within just 15&#xa0;min under visible light. Radical scavenging activity (RSA), measured using the DPPH assay, reached a maximum of 80.44% after 60&#xa0;min, with a rate constant of 0.3208&#xa0;mM/min. The bandgap energy was optimized to 3.1346&#xa0;eV, enabling efficient visible-light activation. Furthermore, the electrospun membranes demonstrated strong antimicrobial activity, with inhibition zones ranging from 25.5 to 33.0&#xa0;mm against <i>Staphylococcus aureus</i>, <i>Escherichia coli</i>, <i>Salmonella typhi</i>, <i>Shigella sonnei</i>, and <i>Candida albicans</i>. In conclusion, the GO-Ni-ZnO nanohybrid electrospun membranes present a sustainable and cost-effective solution that addresses key limitations of traditional photocatalysts. The scalable fabrication method, enhanced functional performance, and broad-spectrum antimicrobial action position this material as a promising candidate for real-world environmental and biomedical applications.</p>

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Harnessing the power of visible light with GO-Ni-ZnO nanohybrid electrospun polymeric membranes for improved photocatalysis: a focused approach to fabrication, characterization, and applications

  • 期刊论文

  • 发表日期：

    2025年7月31日

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  • Viraj Pasindu,
  • Piumika Yapa,
  • Sanduni Dabare,
  • Imalka Munaweera,
  • Thusitha Etampawala,
  • Manjula M. Weerasekera,
  • Dinesh Attygalle,
  • Shantha Amarasinghe

摘要

Photocatalysis using metal-doped nanoparticle systems, such as Ni-doped ZnO, holds significant promise for addressing global challenges in environmental remediation, energy production, and biomedical applications. However, conventional photocatalysts often face limitations such as wide bandgaps, rapid charge recombination, poor reusability, and limited visible-light activity factors that hinder their practical deployment in real-world applications. To overcome these challenges, this study presents a multifunctional graphene oxide–nickel–zinc oxide (GO-Ni-ZnO) nanohybrid system, engineered to improve photocatalytic performance, stability, and antimicrobial efficacy under visible light. The primary objective was to develop and evaluate an electrospun cellulose acetate (CA) membrane embedded with GO-Ni-ZnO nanohybrids, offering a synergistic combination of bandgap narrowing, enhanced charge separation, and high surface area for advanced photocatalytic and antimicrobial applications. The nanohybrid membranes were synthesized using Sol-gel method followed by electrospinning and characterized via FTIR, Raman spectroscopy, SEM, XRD, and UV–Vis diffuse reflectance spectroscopy. The most effective composition 4% GO + 5% Ni-ZnO achieved a photocatalytic degradation efficiency of 93.41% for methylene blue within just 15 min under visible light. Radical scavenging activity (RSA), measured using the DPPH assay, reached a maximum of 80.44% after 60 min, with a rate constant of 0.3208 mM/min. The bandgap energy was optimized to 3.1346 eV, enabling efficient visible-light activation. Furthermore, the electrospun membranes demonstrated strong antimicrobial activity, with inhibition zones ranging from 25.5 to 33.0 mm against Staphylococcus aureus, Escherichia coli, Salmonella typhi, Shigella sonnei, and Candida albicans. In conclusion, the GO-Ni-ZnO nanohybrid electrospun membranes present a sustainable and cost-effective solution that addresses key limitations of traditional photocatalysts. The scalable fabrication method, enhanced functional performance, and broad-spectrum antimicrobial action position this material as a promising candidate for real-world environmental and biomedical applications.