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<p>As a frequently used water-soluble dye, methylene blue has aroused many concerns for its environmental problems. In this work, copper ferrite (CuFe<sub>2</sub>O<sub>4</sub>) thin films were synthesized on glass substrates at 623&#xa0;K using the spray pyrolysis method. The physical properties of the samples were conducted by the X-ray diffraction (XRD), the Fourier Transform Infrared Spectroscopy (FTIR) and the UV-Visible Spectroscopy techniques. The structure analysis showed that CuFe<sub>2</sub>O<sub>4</sub> has a cubic spinel structure and its crystallite size and dislocation density were found to be 29&#xa0;nm and 11.2 10<sup>− 4</sup> nm<sup>− 2</sup>, respectively. CuFe<sub>2</sub>O<sub>4</sub> thin film energy band gap was determined to be 1.98&#xa0;eV that facilitates enhanced performance of photocatalysis in visible region. The photocatalytic activity of as-prepared films when irradiated with solar light was evaluated on basis of methylene blue (MB) dye degradation. The effect of pH value (5, 6.3 and 9) and initial concentration of MB (2–8&#xa0;mg/L) were studied. The percentage of MB degradation for 2&#xa0;mg/L for 120&#xa0;min in the presence of CuFe<sub>2</sub>O<sub>4</sub> films was about 87.13%; whereas for an MB concentration of 8&#xa0;mg/L, it was reduced to about 36.94% during the same reaction time. Also, the results showed that CuFe<sub>2</sub>O<sub>4</sub> material has excellent photocatalytic activity under basic pH (pH = 9). Moreover, the reusability test showed that the photocatalyst efficiency decreased by less than 5% after 4 recycles which indicated good photocatalyst stability. Finally, the mechanism of degradation was investigated. Our findings may have a new way to facilitate the design of photocatalysts for water treatment.</p>

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Enhanced photocatalytic degradation of methylene blue from aqueous solution by a copper ferrite (CuFe2O4) thin films under solar light irradiation: efficiency, stability and kinetic studies

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • I. Saafi,
  • J. Ben naceur,
  • S. Lazzez,
  • M. Amlouk,
  • R. Chtourou

摘要

As a frequently used water-soluble dye, methylene blue has aroused many concerns for its environmental problems. In this work, copper ferrite (CuFe2O4) thin films were synthesized on glass substrates at 623 K using the spray pyrolysis method. The physical properties of the samples were conducted by the X-ray diffraction (XRD), the Fourier Transform Infrared Spectroscopy (FTIR) and the UV-Visible Spectroscopy techniques. The structure analysis showed that CuFe2O4 has a cubic spinel structure and its crystallite size and dislocation density were found to be 29 nm and 11.2 10− 4 nm− 2, respectively. CuFe2O4 thin film energy band gap was determined to be 1.98 eV that facilitates enhanced performance of photocatalysis in visible region. The photocatalytic activity of as-prepared films when irradiated with solar light was evaluated on basis of methylene blue (MB) dye degradation. The effect of pH value (5, 6.3 and 9) and initial concentration of MB (2–8 mg/L) were studied. The percentage of MB degradation for 2 mg/L for 120 min in the presence of CuFe2O4 films was about 87.13%; whereas for an MB concentration of 8 mg/L, it was reduced to about 36.94% during the same reaction time. Also, the results showed that CuFe2O4 material has excellent photocatalytic activity under basic pH (pH = 9). Moreover, the reusability test showed that the photocatalyst efficiency decreased by less than 5% after 4 recycles which indicated good photocatalyst stability. Finally, the mechanism of degradation was investigated. Our findings may have a new way to facilitate the design of photocatalysts for water treatment.