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<p>This study presents the synthesis and evaluation of a series of CeO₂@rGO nanocomposites as efficient photocatalysts using the microwave irradiation method. The structural, morphological, and optical properties of the synthesized photocatalysts have been characterized x-ray diffraction (XRD), UV-DRS, x-ray photoelectron spectroscopy (XPS), photoluminescence (PL), Raman spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). XRD analysis confirmed the formation of cubic-phase CeO₂ with graphene incorporation, with a crystal size of approximately 32&#xa0;nm calculated using the Scherrer equation. SEM and TEM images revealed spherical CeO₂ nanoparticles (30–35&#xa0;nm) uniformly dispersed on graphene nanosheets. N₂ adsorption-desorption analysis indicated a mesoporous structure with an enhanced surface area of 83.5 m<sup>2</sup>/g, while the optimized CeO₂/graphene (3:1) composite exhibited a pore size of 29.3&#xa0;nm. UV-DRS analysis showed a redshift in the optical absorption edge, reducing the bandgap to 2.51&#xa0;eV, and PL measurements confirmed suppressed electron–hole recombination. The photocatalytic activity of the CeO₂/graphene nanocomposite has been evaluated for the degradation of orange G (OG) and eosin yellow (EY) dyes under UV irradiation. The optimized catalyst (CEG3) achieved maximum degradation efficiencies of 95.69% for OG and 99.6% for EY under optimal conditions. The effects of pH, catalyst dosage, initial dye concentration, and electrolyte presence on photocatalytic performance have been systematically investigated. Moreover, the catalyst demonstrated excellent reusability, retaining high efficiency even after three cycles. These results highlight the potential of CeO₂/graphene nanocomposites as high-performance photocatalysts for wastewater treatment applications.</p>

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A Novel CeO₂/rGO Nanocomposite for Photocatalytic Degradation of Orange G and Eosin Yellow Pollutants

  • 期刊论文

  • 发表日期：

    2025年5月15日

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  • Govindaraj Subramanian Gayathri,
  • Sundaramoorthy Vasanthan,
  • Ramakrishnan Venkatesh,
  • Kistan Andiyappan

摘要

This study presents the synthesis and evaluation of a series of CeO₂@rGO nanocomposites as efficient photocatalysts using the microwave irradiation method. The structural, morphological, and optical properties of the synthesized photocatalysts have been characterized x-ray diffraction (XRD), UV-DRS, x-ray photoelectron spectroscopy (XPS), photoluminescence (PL), Raman spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). XRD analysis confirmed the formation of cubic-phase CeO₂ with graphene incorporation, with a crystal size of approximately 32 nm calculated using the Scherrer equation. SEM and TEM images revealed spherical CeO₂ nanoparticles (30–35 nm) uniformly dispersed on graphene nanosheets. N₂ adsorption-desorption analysis indicated a mesoporous structure with an enhanced surface area of 83.5 m2/g, while the optimized CeO₂/graphene (3:1) composite exhibited a pore size of 29.3 nm. UV-DRS analysis showed a redshift in the optical absorption edge, reducing the bandgap to 2.51 eV, and PL measurements confirmed suppressed electron–hole recombination. The photocatalytic activity of the CeO₂/graphene nanocomposite has been evaluated for the degradation of orange G (OG) and eosin yellow (EY) dyes under UV irradiation. The optimized catalyst (CEG3) achieved maximum degradation efficiencies of 95.69% for OG and 99.6% for EY under optimal conditions. The effects of pH, catalyst dosage, initial dye concentration, and electrolyte presence on photocatalytic performance have been systematically investigated. Moreover, the catalyst demonstrated excellent reusability, retaining high efficiency even after three cycles. These results highlight the potential of CeO₂/graphene nanocomposites as high-performance photocatalysts for wastewater treatment applications.