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<p>Orange peel extract served as the biomass component during calcination of the cerium precursor to prepare OP-CeO<sub>2</sub>-Nps. SEM images distinguished the two materials morphologically: CeO<sub>2</sub>-Nps were composed mainly of spherical particles, whereas OP-CeO<sub>2</sub>-Nps showed an uneven porous powder form. X-ray diffraction and Raman analysis verified that the cubic fluorite phase remained in the nanoparticles, and the Ce–O vibration was supported by FT-IR and Raman signals. XPS further clarified the chemical states of C(1s), O(1s), and Ce(3d). UV-Vis diffuse reflectance placed the OP-CeO<sub>2</sub>-Nps energy positions at -0.50 to 2.64&#xa0;eV and those of CeO<sub>2</sub>-Nps at -0.395 to 2.535&#xa0;eV. Ciprofloxacin (CIP) served as the antibiotic model compound for photocatalytic evaluation. Under UV irradiation, OP-CeO<sub>2</sub>-Nps achieved better degradation than CeO<sub>2</sub>-Nps, with efficiency varying with pH, catalyst amount, and initial CIP level. Scavenging experiments identified the main reactive roles of h<sup>+</sup>, ⋅OH, and ⋅O<sup>–</sup><sub>2</sub> during CIP decomposition. Taken together, OP-CeO<sub>2</sub>-Nps is a promising photocatalyst for antibiotic-like wastewater, and it also generated obvious inhibition zones against Escherichia coli, Staphylococcus aureus, and Bacillus subtilis.</p> Graphical Abstract

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Research on the Use of Green-Synthesized Cerium Oxide Particles for Removing Ciprofloxacin from Aqueous Solutions and Their Antibacterial Effects

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Zhao Ling Meng,
  • Chun Guang Li,
  • Yu Qing Liu,
  • Ming Yi Li,
  • Shi Hao Wang,
  • Baifeng Ma

摘要

Orange peel extract served as the biomass component during calcination of the cerium precursor to prepare OP-CeO2-Nps. SEM images distinguished the two materials morphologically: CeO2-Nps were composed mainly of spherical particles, whereas OP-CeO2-Nps showed an uneven porous powder form. X-ray diffraction and Raman analysis verified that the cubic fluorite phase remained in the nanoparticles, and the Ce–O vibration was supported by FT-IR and Raman signals. XPS further clarified the chemical states of C(1s), O(1s), and Ce(3d). UV-Vis diffuse reflectance placed the OP-CeO2-Nps energy positions at -0.50 to 2.64 eV and those of CeO2-Nps at -0.395 to 2.535 eV. Ciprofloxacin (CIP) served as the antibiotic model compound for photocatalytic evaluation. Under UV irradiation, OP-CeO2-Nps achieved better degradation than CeO2-Nps, with efficiency varying with pH, catalyst amount, and initial CIP level. Scavenging experiments identified the main reactive roles of h+, ⋅OH, and ⋅O–2 during CIP decomposition. Taken together, OP-CeO2-Nps is a promising photocatalyst for antibiotic-like wastewater, and it also generated obvious inhibition zones against Escherichia coli, Staphylococcus aureus, and Bacillus subtilis.

Graphical Abstract