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<p>This study introduces a green synthesis route for nickel oxide nanoparticles (NiO NPs) using aloe vera (AV) leaf extract via the Photon Induced Method (PIM). The extract served as both reducing and stabilizing agent, enabling an eco-friendly and cost-effective process. X-ray diffraction (XRD) confirmed the crystalline nature of the NiO NPs (crystallite size 29&#xa0;nm), while Fourier Transform Infrared Spectroscopy (FTIR) indicated retention of organic groups post-calcination. The bandgap of the synthesized AV-NiO NPs was 3.05&#xa0;eV, lower than the bulk value (3.7&#xa0;eV), and High-Resolution Transmission Electron Microscopy (HR-TEM) revealed spherical and rod-like morphologies with rods under 50&#xa0;nm. Photocatalytic testing showed 82% methyl orange (MO) degradation under sunlight in 120&#xa0;min, with a rate constant about five times higher than that of conventionally synthesized NiO. These findings highlight the potential of AV-NiO NPs in sustainable environmental applications.</p>

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Green Synthesis of Structural and Bandgap Engineering Nickel Oxide Nanostructure for Visible Light Photocatalyst

  • 期刊论文

  • 发表日期：

    2025年6月11日

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  • Moganesh Govindhan

摘要

This study introduces a green synthesis route for nickel oxide nanoparticles (NiO NPs) using aloe vera (AV) leaf extract via the Photon Induced Method (PIM). The extract served as both reducing and stabilizing agent, enabling an eco-friendly and cost-effective process. X-ray diffraction (XRD) confirmed the crystalline nature of the NiO NPs (crystallite size 29 nm), while Fourier Transform Infrared Spectroscopy (FTIR) indicated retention of organic groups post-calcination. The bandgap of the synthesized AV-NiO NPs was 3.05 eV, lower than the bulk value (3.7 eV), and High-Resolution Transmission Electron Microscopy (HR-TEM) revealed spherical and rod-like morphologies with rods under 50 nm. Photocatalytic testing showed 82% methyl orange (MO) degradation under sunlight in 120 min, with a rate constant about five times higher than that of conventionally synthesized NiO. These findings highlight the potential of AV-NiO NPs in sustainable environmental applications.