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<p>A CeO<sub>2</sub>/Ag<sub>2</sub>WO<sub>4</sub> heterojunction nanocomposite was synthesized via a controlled precipitation method and evaluated for its physicochemical and photocatalytic properties. XRD, FTIR, XPS, SEM, and EDS analyses confirmed the successful coupling of cubic CeO2 nanoparticles with monoclinic Ag₂WO₄ nanorods to form a well-integrated heterostructure. UV–DRS analysis revealed a reduced band gap of ~ 2.2&#xa0;eV, resulting in enhanced visible-light absorption. The strong interfacial interaction effectively suppressed charge-carrier recombination and promoted efficient electron–hole separation. Consequently, the CeO<sub>2</sub>/Ag<sub>2</sub>WO<sub>4</sub> composite exhibited superior photocatalytic performance compared with the individual components. Under visible-light irradiation, ~ 90% degradation of Brilliant Blue dye and ~ 70% degradation of ciprofloxacin were achieved within 60&#xa0;min. The degradation followed pseudo-first-order kinetics, with the heterojunction showing the highest rate constants. Radical trapping experiments identified •OH and •O₂⁻ as the dominant reactive species, while band-alignment analysis confirmed a favourable charge-transfer pathway that enhances redox reactions. Overall, the CeO<sub>2</sub>/Ag<sub>2</sub>WO<sub>4</sub> heterostructure represents an efficient, stable, and noble-metal-free photocatalyst for visible-light-driven wastewater treatment.</p>

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A noble metal free CeO2/Ag2WO4 heterostructured photocatalyst for rapid visible light remediation of dye and pharmaceuticalcontaminated wastewater

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • D. Dulasimathi,
  • V. Sasikala,
  • M. Prabhaharan,
  • R. Aswini,
  • S. Thanka Rajan,
  • Muthumareeswaran Muthuramamoorthy,
  • Shofiur Rahman

摘要

A CeO2/Ag2WO4 heterojunction nanocomposite was synthesized via a controlled precipitation method and evaluated for its physicochemical and photocatalytic properties. XRD, FTIR, XPS, SEM, and EDS analyses confirmed the successful coupling of cubic CeO2 nanoparticles with monoclinic Ag₂WO₄ nanorods to form a well-integrated heterostructure. UV–DRS analysis revealed a reduced band gap of ~ 2.2 eV, resulting in enhanced visible-light absorption. The strong interfacial interaction effectively suppressed charge-carrier recombination and promoted efficient electron–hole separation. Consequently, the CeO2/Ag2WO4 composite exhibited superior photocatalytic performance compared with the individual components. Under visible-light irradiation, ~ 90% degradation of Brilliant Blue dye and ~ 70% degradation of ciprofloxacin were achieved within 60 min. The degradation followed pseudo-first-order kinetics, with the heterojunction showing the highest rate constants. Radical trapping experiments identified •OH and •O₂⁻ as the dominant reactive species, while band-alignment analysis confirmed a favourable charge-transfer pathway that enhances redox reactions. Overall, the CeO2/Ag2WO4 heterostructure represents an efficient, stable, and noble-metal-free photocatalyst for visible-light-driven wastewater treatment.