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<p>The α-, β-, γ-MnO<sub>2</sub> and MnO<sub>2</sub>-Ag catalysts were synthesized by a simple hydrothermal method and tested for photocatalytic oxidation of formaldehyde. The catalysts were characterized by experimental and theoretical methods to explain the reason for the enhanced catalytic performance. The results indicated that variations in crystal structure significantly influenced catalytic activity. The introduction of Ag into MnO<sub>2</sub> facilitates the formation of new energy levels, which enhances electron–hole separation efficiency. Subsequently, it promotes the generation of superoxide radicals (•O₂⁻) and hydroxyl radicals (•OH), thereby significantly enhancing formaldehyde removal efficiency. Among all the catalysts, γ-MnO<sub>2</sub>-Ag exhibited superior catalytic performance, achieving a formaldehyde conversion rate of 90.82% within 120&#xa0;min. Owing to its efficient photocatalytic oxidation performance and straightforward synthesis method, γ-MnO<sub>2</sub>-Ag shows great potential as a promising catalytic support material for HCHO catalysis.</p>

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Efficient photocatalytic oxidation of formaldehyde over Ag-doped MnO2 catalysts with different crystal structure

  • 期刊论文

  • 发表日期：

    2025年8月20日

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  • Minmin Guo,
  • Jinpeng Guo,
  • Huimin Yang,
  • Yuting Du,
  • Sanhu Zhao

摘要

The α-, β-, γ-MnO2 and MnO2-Ag catalysts were synthesized by a simple hydrothermal method and tested for photocatalytic oxidation of formaldehyde. The catalysts were characterized by experimental and theoretical methods to explain the reason for the enhanced catalytic performance. The results indicated that variations in crystal structure significantly influenced catalytic activity. The introduction of Ag into MnO2 facilitates the formation of new energy levels, which enhances electron–hole separation efficiency. Subsequently, it promotes the generation of superoxide radicals (•O₂⁻) and hydroxyl radicals (•OH), thereby significantly enhancing formaldehyde removal efficiency. Among all the catalysts, γ-MnO2-Ag exhibited superior catalytic performance, achieving a formaldehyde conversion rate of 90.82% within 120 min. Owing to its efficient photocatalytic oxidation performance and straightforward synthesis method, γ-MnO2-Ag shows great potential as a promising catalytic support material for HCHO catalysis.