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<p>In this research, zinc oxide nanoparticles (ZnO NPs) were greenly synthesized by olive leaf extract (Dan, <i>Olea europaea</i>) and characterized using an atomic force microscope (AFM), field emission-scanning electron microscopy (FE-SEM), Energy Dispersive X-ray Analysis<b> (</b>EDX), Fourier Transform Infra-Red <b>(</b>FTIR) Spectroscopy, and ultraviolet–visible spectrophotometers (UV–Vis) to analyze their size, morphology, chemical composition, and optical properties. Additionally, photocatalytic dye degradation was evaluated against methylene blue dye (MB) under natural sunlight illumination. The results showed the successful biosynthesis of ZnO NPs with a yield of 56.62% and a mean size investigated by AFM of 60 nm. UV–Vis spectroscopy revealed that the aqueous solution with ZnO NPs had an absorption maximum of 375 nm, and the band gap of ZnO NPs was determined to be 2.87 eV. The FT-IR spectra revealed an absorption peak at 430.48 cm<sup>−1</sup>, which corresponds to Zn–O stretching. FESEM images showed that ZnO NPs are spherical, with a mean diameter of around 67.19 nm. The elemental composition obtained via EDX analysis showed that pure ZnO NPs were produced, and the weight percentages of zinc and oxygen were 84.88 and 15.12%, respectively. The photocatalytic experiment showed excellent degradation efficiency for MB dyes, reaching 97.17% after 120 min.</p>

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Green synthesis of zinc oxide nanoparticles using olive leaf extract and investigating their photocatalytic activity

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Tahani Alidee,
  • Hoda Habbal,
  • Ibrahim Alghoraibi,
  • Mohamad Alshehabi

摘要

In this research, zinc oxide nanoparticles (ZnO NPs) were greenly synthesized by olive leaf extract (Dan, Olea europaea) and characterized using an atomic force microscope (AFM), field emission-scanning electron microscopy (FE-SEM), Energy Dispersive X-ray Analysis (EDX), Fourier Transform Infra-Red (FTIR) Spectroscopy, and ultraviolet–visible spectrophotometers (UV–Vis) to analyze their size, morphology, chemical composition, and optical properties. Additionally, photocatalytic dye degradation was evaluated against methylene blue dye (MB) under natural sunlight illumination. The results showed the successful biosynthesis of ZnO NPs with a yield of 56.62% and a mean size investigated by AFM of 60 nm. UV–Vis spectroscopy revealed that the aqueous solution with ZnO NPs had an absorption maximum of 375 nm, and the band gap of ZnO NPs was determined to be 2.87 eV. The FT-IR spectra revealed an absorption peak at 430.48 cm−1, which corresponds to Zn–O stretching. FESEM images showed that ZnO NPs are spherical, with a mean diameter of around 67.19 nm. The elemental composition obtained via EDX analysis showed that pure ZnO NPs were produced, and the weight percentages of zinc and oxygen were 84.88 and 15.12%, respectively. The photocatalytic experiment showed excellent degradation efficiency for MB dyes, reaching 97.17% after 120 min.