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<p>Perovskite-type oxides that feature a flexibly tunable structure exhibit diverse properties and are thereby extensively applied in the field of photocatalysis. LaFeO<sub>3</sub> among them that possesses a relatively narrow band gap shows high photocatalytic degradation capability. Its practical application, however, is hindered by drawbacks such as weak responsiveness to visible light and easy recombination of hole-electron pairs. Perovskite-type Mn-doped LaFeO<sub>3</sub> photocatalysts (LaFe<sub>1-x</sub>Mn<sub>x</sub>O<sub>3</sub>, x = 0, 0.01, 0.02, 0.03, 0.05) in this study were prepared via the sol–gel auto-combustion method and their degradation activity toward organic pollutants was evaluated. A series of characterization tests that include X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and ultraviolet spectroscopy were conducted. The photocatalytic performance of LaFe<sub>1-x</sub>Mn<sub>x</sub>O<sub>3</sub> was investigated through methylene blue degradation experiments under visible light and the sample with 2% Mn doping exhibited the best photocatalytic activity, achieving a degradation rate of 96.15% for methylene blue within 120&#xa0;min and an apparent rate constant of 0.0269&#xa0;min<sup>−1</sup> that is 8 times that of the undoped sample. This research offers valuable reference to the design of high-efficiency perovskite photocatalysts in environmental remediation fields for dye wastewater treatment.</p>

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Preparation and degradation performance of perovskite oxide Mn-doped LaFeO3 photocatalyst for removal of dye from water

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Yi Zhao,
  • Yukun Fang,
  • Zhe Zhang,
  • Hui Fan

摘要

Perovskite-type oxides that feature a flexibly tunable structure exhibit diverse properties and are thereby extensively applied in the field of photocatalysis. LaFeO3 among them that possesses a relatively narrow band gap shows high photocatalytic degradation capability. Its practical application, however, is hindered by drawbacks such as weak responsiveness to visible light and easy recombination of hole-electron pairs. Perovskite-type Mn-doped LaFeO3 photocatalysts (LaFe1-xMnxO3, x = 0, 0.01, 0.02, 0.03, 0.05) in this study were prepared via the sol–gel auto-combustion method and their degradation activity toward organic pollutants was evaluated. A series of characterization tests that include X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and ultraviolet spectroscopy were conducted. The photocatalytic performance of LaFe1-xMnxO3 was investigated through methylene blue degradation experiments under visible light and the sample with 2% Mn doping exhibited the best photocatalytic activity, achieving a degradation rate of 96.15% for methylene blue within 120 min and an apparent rate constant of 0.0269 min−1 that is 8 times that of the undoped sample. This research offers valuable reference to the design of high-efficiency perovskite photocatalysts in environmental remediation fields for dye wastewater treatment.