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<p>An environmentally benign approach was developed where duckweed extracts were employed to synthesize zinc oxide nanoparticles (ZnO NPs). The synthesized ZnO NPs were characterized by UV-visible spectroscopy, Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDS). The XRD analysis showed that ZnO NPs adopt hexagonal wurtzite crystal packing with crystallite size within nanometer range. The UV-visible spectrum confirmed the characteristic absorption peak for ZnO NPs at around 378 nm. FTIR analysis revealed the presence of various functional groups present on the synthesized nanomaterial. Electron microscope analysis showed that the synthesized ZnO NPs have irregular, quasi-spherical morphology with the size range of 18–38 nm. The mean diameter of synthesized material was calculated to be 28.61 nm. The antibacterial efficacy of the ZnO NPs was evaluated against Gram-positive and Gram-negative bacteria strains <i>Bacillus subtilis</i> (<i>B. subtilis</i>) and <i>Salmonella typhi</i> (<i>S. typhi</i>), respectively, with encouraging results. The antioxidant activity of ZnO NPs was assessed using DPPH assay. The Trolox equivalent antioxidant capacity (TEAC) of this material was found to be 19.84 µmol Trolox/mg, indicating the high antioxidant capability. Further, the ZnO NPs exhibit significant photocatalytic activity against cationic methylene blue dye under solar irradiation, and the activity was retained after multiple cycles.</p>

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Duckweed extract-mediated green synthesis of ZnO nanoparticles and its antibacterial, antioxidant, and photocatalytic properties

  • 期刊论文

  • 发表日期：

    2025年3月6日

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  • Yogesh Kumar Shukla,
  • Priyansh Pandey,
  • Janardan Prasad Pandey,
  • Alok Shukla,
  • Jitendra Kumar

摘要

An environmentally benign approach was developed where duckweed extracts were employed to synthesize zinc oxide nanoparticles (ZnO NPs). The synthesized ZnO NPs were characterized by UV-visible spectroscopy, Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDS). The XRD analysis showed that ZnO NPs adopt hexagonal wurtzite crystal packing with crystallite size within nanometer range. The UV-visible spectrum confirmed the characteristic absorption peak for ZnO NPs at around 378 nm. FTIR analysis revealed the presence of various functional groups present on the synthesized nanomaterial. Electron microscope analysis showed that the synthesized ZnO NPs have irregular, quasi-spherical morphology with the size range of 18–38 nm. The mean diameter of synthesized material was calculated to be 28.61 nm. The antibacterial efficacy of the ZnO NPs was evaluated against Gram-positive and Gram-negative bacteria strains Bacillus subtilis (B. subtilis) and Salmonella typhi (S. typhi), respectively, with encouraging results. The antioxidant activity of ZnO NPs was assessed using DPPH assay. The Trolox equivalent antioxidant capacity (TEAC) of this material was found to be 19.84 µmol Trolox/mg, indicating the high antioxidant capability. Further, the ZnO NPs exhibit significant photocatalytic activity against cationic methylene blue dye under solar irradiation, and the activity was retained after multiple cycles.