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<p>In this study, cerium oxide-based nanocomposites integrated with graphite, CeO<sub>2</sub>@ graphite, Ce<sub>0.50</sub>Al<sub>0.50</sub>O<sub>2-δ</sub>@graphite, Ce<sub>0.90</sub>Cu<sub>0.10</sub>O<sub>2-δ</sub> @ graphite, and Ce<sub>0.60</sub>Zn<sub>0.40</sub>O<sub>2-δ</sub>@graphite were synthesized via a simple in-situ chemical method. Their structural, chemical, and morphological features were characterized using XRD, FTIR, EDAX, and SEM. The XRD pattern of graphite shows a prominent (002) reflection at 2θ ≈ 26.3–26.6°, confirming its characteristic layered structure. The ceria–graphite composites retain this graphite peak and also exhibit CeO<sub>2</sub> reflections. The FTIR spectra show a graphite-related peak, while the composites exhibit a 1632&#xa0;cm⁻<sup>1</sup> hydroxyl band and a 400–600&#xa0;cm⁻<sup>1</sup> metal–oxygen vibration region. From the EDAX spectra, peaks corresponding to Ce, Al, Cu, Zn, O, and C were clearly observed. The SEM images show flake-like graphite filaments with a rough surface decorated by nanosized doped-ceria grains (200–500&#xa0;nm). The photocatalytic activity of the nanocomposites was assessed using Rhodamine B under UV light, and the Ce<sub>0.50</sub>Al<sub>0.50</sub>O<sub>2-δ</sub>@graphite sample showed the highest degradation efficiency of 82.21%. Graphite incorporation enhanced performance by improving charge separation and surface interaction. The effects of pH and initial dye concentration were also examined. Overall, the Al-doped ceria–graphite composite demonstrates strong potential for environmental remediation applications.</p>

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In situ engineered CeO2@graphite nanostructures: robust photocatalysts for degradation of Rhodamine B dye

  • 期刊论文

  • 发表日期：

    2025年12月20日

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  • Swathi Chidaraboyina,
  • Arputharaj Samson Nesaraj,
  • Manasai Arunkumar

摘要

In this study, cerium oxide-based nanocomposites integrated with graphite, CeO2@ graphite, Ce0.50Al0.50O2-δ@graphite, Ce0.90Cu0.10O2-δ @ graphite, and Ce0.60Zn0.40O2-δ@graphite were synthesized via a simple in-situ chemical method. Their structural, chemical, and morphological features were characterized using XRD, FTIR, EDAX, and SEM. The XRD pattern of graphite shows a prominent (002) reflection at 2θ ≈ 26.3–26.6°, confirming its characteristic layered structure. The ceria–graphite composites retain this graphite peak and also exhibit CeO2 reflections. The FTIR spectra show a graphite-related peak, while the composites exhibit a 1632 cm⁻1 hydroxyl band and a 400–600 cm⁻1 metal–oxygen vibration region. From the EDAX spectra, peaks corresponding to Ce, Al, Cu, Zn, O, and C were clearly observed. The SEM images show flake-like graphite filaments with a rough surface decorated by nanosized doped-ceria grains (200–500 nm). The photocatalytic activity of the nanocomposites was assessed using Rhodamine B under UV light, and the Ce0.50Al0.50O2-δ@graphite sample showed the highest degradation efficiency of 82.21%. Graphite incorporation enhanced performance by improving charge separation and surface interaction. The effects of pH and initial dye concentration were also examined. Overall, the Al-doped ceria–graphite composite demonstrates strong potential for environmental remediation applications.