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<p>This study explores the enhancement of methylene blue (MB) dye degradation by using cerium oxide nanoparticles (CeO<sub>2</sub> NPs) that have been green synthesized, with <i>Cleome gynandra</i> seed extract acting as natural reducing and stabilizing agents. Green synthesis provides a sustainable and environmentally friendly alternative to conventional methods for producing CeO<sub>2</sub> NPs, thereby decreasing harmful environmental impacts. To enhance their performance in dye degradation and electrochemical applications, the synthesized NPs were further optimized. The X-ray diffraction (XRD) pattern indicated the face-centered cubic structure of CeO<sub>2</sub>-NPs, which had a crystallite size of around 34.12&#xa0;nm. The scanning electron microscopy (SEM) studies revealed the spherical form of CeO<sub>2</sub> nanoparticles. The UV–Visible spectroscopy revealed a band gap of 3.2&#xa0;eV, which is suitable for absorption in the UV region. The bio-synthesized CeO<sub>2</sub>-NPs demonstrated a superior photocatalytic decolorization efficiency by exhibiting 94% methylene blue (MB) dye degradation efficiency after exposure to UV light at 180&#xa0;min. Further, the reusability experiment reveals better photostability of CeO<sub>2</sub> NPs. Additionally, the cyclic voltammetry (CV) analysis of the CeO<sub>2</sub> demonstrated remarkable bio-analyte sensing abilities by presenting significant oxidation and reduction peaks towards paracetamol sensing. Electrochemical impedance spectroscopy (EIS) presented significant findings into the ionic conductivity of a material and the capacitive performance of the CeO<sub>2</sub>-modified electrode.</p>

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Eco-efficient synthesis of cerium oxide nanoparticles via combustion method: enhanced their photocatalytic, and electrochemical properties

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Thejaswini M.,
  • Lakshmi Ranganatha V.,
  • Pramila S.,
  • Sangamesha M. A.,
  • Nagaraju G.,
  • Shivaganga G. S.,
  • Sharath Chandra N.,
  • Mallikarjunaswamy C.

摘要

This study explores the enhancement of methylene blue (MB) dye degradation by using cerium oxide nanoparticles (CeO2 NPs) that have been green synthesized, with Cleome gynandra seed extract acting as natural reducing and stabilizing agents. Green synthesis provides a sustainable and environmentally friendly alternative to conventional methods for producing CeO2 NPs, thereby decreasing harmful environmental impacts. To enhance their performance in dye degradation and electrochemical applications, the synthesized NPs were further optimized. The X-ray diffraction (XRD) pattern indicated the face-centered cubic structure of CeO2-NPs, which had a crystallite size of around 34.12 nm. The scanning electron microscopy (SEM) studies revealed the spherical form of CeO2 nanoparticles. The UV–Visible spectroscopy revealed a band gap of 3.2 eV, which is suitable for absorption in the UV region. The bio-synthesized CeO2-NPs demonstrated a superior photocatalytic decolorization efficiency by exhibiting 94% methylene blue (MB) dye degradation efficiency after exposure to UV light at 180 min. Further, the reusability experiment reveals better photostability of CeO2 NPs. Additionally, the cyclic voltammetry (CV) analysis of the CeO2 demonstrated remarkable bio-analyte sensing abilities by presenting significant oxidation and reduction peaks towards paracetamol sensing. Electrochemical impedance spectroscopy (EIS) presented significant findings into the ionic conductivity of a material and the capacitive performance of the CeO2-modified electrode.