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<p>In this study, a cerium oxide (CeO<sub>2</sub>)/reduced graphene oxide (rGO) nanocomposite was synthesized and thoroughly investigated for its optical and dielectric properties with the aim of enhancing visible-light-driven photocatalytic degradation of rhodamine B. Structural and morphological analyses confirmed the successful integration of crystalline CeO<sub>2</sub> nanoparticles onto conductive rGO sheets, forming a well-connected heterojunction. Optical characterization revealed strong absorption in the visible region, with a reduced bandgap and high extinction coefficient, indicating efficient photon harvesting. Dielectric measurements demonstrated high dielectric constant values, low dissipation factor, and extended relaxation times, reflecting effective charge polarization and minimal energy loss during light excitation. The nanocomposite also exhibited enhanced optical and electrical conductivity, confirming the presence of fast charge carrier pathways and low recombination rates. These favorable optical and dielectric characteristics translated into excellent photocatalytic performance under visible light, making the CeO<sub>2</sub>/rGO system a highly promising material for environmental remediation of dye-contaminated water.</p>

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Tailoring Optical and Dielectric Properties of CeO2/rGO Nanocomposites for Enhanced Photodegradation of Rhodamine B Under Visible Light

  • 期刊论文

  • 发表日期：

    2025年10月8日

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  • Karima Kahlouche,
  • Khaled Derkaoui,
  • Afaf Brik,
  • Abdelyamine Naitbouda,
  • Ismail Bencherifa,
  • Toufik Hadjersi

摘要

In this study, a cerium oxide (CeO2)/reduced graphene oxide (rGO) nanocomposite was synthesized and thoroughly investigated for its optical and dielectric properties with the aim of enhancing visible-light-driven photocatalytic degradation of rhodamine B. Structural and morphological analyses confirmed the successful integration of crystalline CeO2 nanoparticles onto conductive rGO sheets, forming a well-connected heterojunction. Optical characterization revealed strong absorption in the visible region, with a reduced bandgap and high extinction coefficient, indicating efficient photon harvesting. Dielectric measurements demonstrated high dielectric constant values, low dissipation factor, and extended relaxation times, reflecting effective charge polarization and minimal energy loss during light excitation. The nanocomposite also exhibited enhanced optical and electrical conductivity, confirming the presence of fast charge carrier pathways and low recombination rates. These favorable optical and dielectric characteristics translated into excellent photocatalytic performance under visible light, making the CeO2/rGO system a highly promising material for environmental remediation of dye-contaminated water.