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<p>Although photocatalytic oxidation technology has demonstrated significant potential for removing gaseous formaldehyde from indoor air, the development of highly efficient and stable catalysts remains challenged and important. In this study, a simple hydrothermal method was employed to synthesize MnO<sub>2</sub>–Zn catalysts with different structures. The inductively coupled plasma optical emission spectrometer (ICP-OES), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Brunauer–Emmett–Teller (BET) specific surface area analysis, UV–Vis diffuse reflectance spectroscopy (UV-DRS), X-ray photoelectron spectroscopy (XPS), laser Raman spectroscopy, and Fourier transform infrared spectroscopy (FTIR) were used to characterize the synthesized materials. Photoelectrochemical performance was conducted using an electrochemical workstation with three-electrode system. The photocatalytic degradation efficiency of the samples for gaseous formaldehyde (HCHO) was evaluated under simulated solar irradiation. Furthermore, the reason for the enhancement of photocatalytic performance was also investigated using theoretical calculation methods. It was found that the catalytic activity of MnO<sub>2</sub> after Zn doping was significantly improved. For <i>α</i>-MnO<sub>₂</sub>-Zn, it demonstrated the highest performance, achieving a formaldehyde removal efficiency of up to 87.33% within 120&#xa0;min, which can be considered as a potential catalytic support material for formaldehyde removal.</p>

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Efficient photocatalytic conversion on MnO2-Zn photocatalyst for gaseous formaldehyde elimination

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Minmin Guo,
  • Huimin Yang,
  • Yuting Du,
  • Sanhu Zhao,
  • Xianting Zhang,
  • Xiaojing Yang

摘要

Although photocatalytic oxidation technology has demonstrated significant potential for removing gaseous formaldehyde from indoor air, the development of highly efficient and stable catalysts remains challenged and important. In this study, a simple hydrothermal method was employed to synthesize MnO2–Zn catalysts with different structures. The inductively coupled plasma optical emission spectrometer (ICP-OES), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Brunauer–Emmett–Teller (BET) specific surface area analysis, UV–Vis diffuse reflectance spectroscopy (UV-DRS), X-ray photoelectron spectroscopy (XPS), laser Raman spectroscopy, and Fourier transform infrared spectroscopy (FTIR) were used to characterize the synthesized materials. Photoelectrochemical performance was conducted using an electrochemical workstation with three-electrode system. The photocatalytic degradation efficiency of the samples for gaseous formaldehyde (HCHO) was evaluated under simulated solar irradiation. Furthermore, the reason for the enhancement of photocatalytic performance was also investigated using theoretical calculation methods. It was found that the catalytic activity of MnO2 after Zn doping was significantly improved. For α-MnO₂-Zn, it demonstrated the highest performance, achieving a formaldehyde removal efficiency of up to 87.33% within 120 min, which can be considered as a potential catalytic support material for formaldehyde removal.