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<p>In this study, Activated Carbon-Cu/CeO₂ (AC-Cu/CeO₂) nanocomposites were synthesized by a simple and low-cost co-precipitation method and comprehensively characterized by FT-IR, XRD, FE-SEM, UV–vis DRS, photoluminescence (PL), HR-TEM, XPS, UV for photocatalytic testing, Raman, and BET surface area analysis. XRD confirmed the cubic structure of CeO₂, and FE-SEM and HR-TEM revealed an aggregated morphology with nanoscale features. UV-vis DRS and PL results showed enhanced visible light absorption and suppressed charge recombination, with calculated band gap energies of 3.07&#xa0;eV (CeO₂), 2.64&#xa0;eV (Cu/CeO₂), and 2.01&#xa0;eV (AC-Cu/CeO₂), respectively. The photocatalytic activity was evaluated under UV irradiation using brilliant green (BG) dye, and the decomposition efficiencies within 90&#xa0;min were 60.32% (CeO₂), 71.42% (Cu/CeO₂), and 92.85% (AC-Cu/CeO₂). Radical scavenger experiments showed that hydroxyl radicals (•OH) and superoxide radicals (•O₂⁻) play a major role in the degradation process. The catalysts maintained an efficiency of 80.23% after five cycles, and structural stability was confirmed by post XRD and FE-SEM. The strong antibacterial activity against six bacterial strains further demonstrates the dual functionality of AC-Cu/CeO₂ in environmental remediation and biomedical applications.</p>

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Enhancement of photocatalytic and antibacterial functions through synergistic effects of Cu/CeO2 nanocomposite supported on activated carbon

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Ranjani Raman,
  • Naveenkumar Ramachandiran,
  • Sivakumari Govindarajan,
  • Karthikeyan Balakrishnan,
  • Senthilvelan Sambandam

摘要

In this study, Activated Carbon-Cu/CeO₂ (AC-Cu/CeO₂) nanocomposites were synthesized by a simple and low-cost co-precipitation method and comprehensively characterized by FT-IR, XRD, FE-SEM, UV–vis DRS, photoluminescence (PL), HR-TEM, XPS, UV for photocatalytic testing, Raman, and BET surface area analysis. XRD confirmed the cubic structure of CeO₂, and FE-SEM and HR-TEM revealed an aggregated morphology with nanoscale features. UV-vis DRS and PL results showed enhanced visible light absorption and suppressed charge recombination, with calculated band gap energies of 3.07 eV (CeO₂), 2.64 eV (Cu/CeO₂), and 2.01 eV (AC-Cu/CeO₂), respectively. The photocatalytic activity was evaluated under UV irradiation using brilliant green (BG) dye, and the decomposition efficiencies within 90 min were 60.32% (CeO₂), 71.42% (Cu/CeO₂), and 92.85% (AC-Cu/CeO₂). Radical scavenger experiments showed that hydroxyl radicals (•OH) and superoxide radicals (•O₂⁻) play a major role in the degradation process. The catalysts maintained an efficiency of 80.23% after five cycles, and structural stability was confirmed by post XRD and FE-SEM. The strong antibacterial activity against six bacterial strains further demonstrates the dual functionality of AC-Cu/CeO₂ in environmental remediation and biomedical applications.