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<p>Varying concentrations of Zn<sup>2+</sup>-substituted α-Fe<sub>2</sub>O<sub>3</sub> were synthesized using hydrothermal approaches, and their photocatalytic efficiencies for the breakdown of the antibiotic chloramphenicol pollutant&#xa0;under UV–visible light irradiation were examined. The effective incorporation of Zn<sup>2+</sup> ions into the α-Fe<sub>2</sub>O<sub>3</sub> crystal lattice was confirmed using XRD and XPS analyses, while the synthesized samples were further characterized using SEM, HRTEM, UV–Vis DRS, EIS, and PL techniques. The findings indicated that Zn<sup>2+</sup> doping significantly impacts both the visible-light photocatalytic activity and the crystal&#xa0;structure. The 2.5% Zn<sup>2+</sup>-substituted α-Fe<sub>2</sub>O<sub>3</sub> photocatalyst, characterized by a flower-like structure, demonstrated the best photocatalytic performance. The improvement is mostly due to the prolonged electron lifetime, achieved by reducing the electron–hole recombination rate by the formation of Zn<sup>2+</sup> as an intermediate energy state. The Zn<sup>2+</sup>-substituted α-Fe<sub>2</sub>O<sub>3</sub> catalyst demonstrates remarkable stability after eight successive runs, maintaining its crystal structure. Furthermore, Zn<sup>2+</sup>-substituted α-Fe<sub>2</sub>O<sub>3</sub> has superior magnetic properties relative to pristine&#xa0;α-Fe<sub>2</sub>O<sub>3</sub>.</p>

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Influence of Zn2+ substitution on the crystal structure of α-Fe2O3 nanoparticles for the maximized photocatalytic chloramphenicol degradation and excellent magnetic behavior

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • R. Ramprasath,
  • S. Cholan,
  • P. Prameela,
  • M. Chitravel,
  • Nouf H. Alotaibi,
  • Vasudeva Reddy Minnam Reddy,
  • Woo Kyoung Kim,
  • A. Raja,
  • Karuppaiah Selvakumar

摘要

Varying concentrations of Zn2+-substituted α-Fe2O3 were synthesized using hydrothermal approaches, and their photocatalytic efficiencies for the breakdown of the antibiotic chloramphenicol pollutant under UV–visible light irradiation were examined. The effective incorporation of Zn2+ ions into the α-Fe2O3 crystal lattice was confirmed using XRD and XPS analyses, while the synthesized samples were further characterized using SEM, HRTEM, UV–Vis DRS, EIS, and PL techniques. The findings indicated that Zn2+ doping significantly impacts both the visible-light photocatalytic activity and the crystal structure. The 2.5% Zn2+-substituted α-Fe2O3 photocatalyst, characterized by a flower-like structure, demonstrated the best photocatalytic performance. The improvement is mostly due to the prolonged electron lifetime, achieved by reducing the electron–hole recombination rate by the formation of Zn2+ as an intermediate energy state. The Zn2+-substituted α-Fe2O3 catalyst demonstrates remarkable stability after eight successive runs, maintaining its crystal structure. Furthermore, Zn2+-substituted α-Fe2O3 has superior magnetic properties relative to pristine α-Fe2O3.