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<p>Water contamination poses a significant environmental challenge worldwide, especially in developing nations where industrial effluents and urbanization have led to severe pollution of water resources. In this study, cerium oxide (CeO₂) and silver-doped cerium oxide (CeO₂/Ag) nanocomposites were synthesized via a facile co-precipitation method using sodium hydroxide as the reducing and precipitating agent. The structural, optical, and morphological characteristics of the materials were analyzed using XRD, FT-IR, Raman spectroscopy, UV–Vis DRS, SEM–EDX, and HR-TEM. The Ag doping effectively reduced the band gap from 2.79&#xa0;eV (CeO₂) to 2.43&#xa0;eV, enhancing visible-light absorption and charge separation. Under solar irradiation, the CeO₂/Ag nanocomposite achieved ~ 84% degradation of methylene blue within 70&#xa0;min, outperforming pristine CeO₂. Additionally, the nanocomposite exhibited strong antibacterial activity against both Gram-positive and Gram-negative bacterial strains, confirming its multifunctional potential for wastewater treatment. The synergistic effect of Ag incorporation improved photocatalytic efficiency and antimicrobial activity, making CeO₂/Ag a promising candidate for sustainable environmental remediation applications.</p>

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An enhanced solar driven photodegradation of methylene blue and antibacterial activity by Ag doped CeO2 nanocatalyst

  • 期刊论文

  • 发表日期：

    2025年12月8日

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  • Rekha Pachaiappan,
  • Sarojini Devi Nagesh,
  • Ashish Kumar Nayak,
  • María Janet Arenas-Herrera,
  • Balu Vinayagamurthi,
  • Lorena Cornejo-Ponce

摘要

Water contamination poses a significant environmental challenge worldwide, especially in developing nations where industrial effluents and urbanization have led to severe pollution of water resources. In this study, cerium oxide (CeO₂) and silver-doped cerium oxide (CeO₂/Ag) nanocomposites were synthesized via a facile co-precipitation method using sodium hydroxide as the reducing and precipitating agent. The structural, optical, and morphological characteristics of the materials were analyzed using XRD, FT-IR, Raman spectroscopy, UV–Vis DRS, SEM–EDX, and HR-TEM. The Ag doping effectively reduced the band gap from 2.79 eV (CeO₂) to 2.43 eV, enhancing visible-light absorption and charge separation. Under solar irradiation, the CeO₂/Ag nanocomposite achieved ~ 84% degradation of methylene blue within 70 min, outperforming pristine CeO₂. Additionally, the nanocomposite exhibited strong antibacterial activity against both Gram-positive and Gram-negative bacterial strains, confirming its multifunctional potential for wastewater treatment. The synergistic effect of Ag incorporation improved photocatalytic efficiency and antimicrobial activity, making CeO₂/Ag a promising candidate for sustainable environmental remediation applications.