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<p>This study aims to develop the multifunctional air purification material integrating efficient formaldehyde catalytic degradation and PM2.5 interception capabilities by controllably synthesizing coconut shell-based activated carbon fiber loaded with mesoporous δ-MnO₂ (δ-MnO₂@ACF). Using ACF as the substrate, MnO₂ was loaded onto its surface via the hydrothermal method, with systematic investigation of the effects of hydrothermal temperature (90–180&#xa0;°C), KMnO₄ concentration (0.005–0.05&#xa0;mol/L) and reaction time (2–8&#xa0;h) on the morphology and crystal phase of MnO₂. The highly active mesoporous δ-MnO₂@ACF composite was successfully prepared. Characterization techniques including SEM, XRD, and BET confirmed the mesoporous structure of δ-MnO₂ and its uniform loading on ACF. Formaldehyde (HCHO) removal tests demonstrated that δ-MnO₂@ACF achieved the removal efficiency of 92%, maintaining 76% efficiency after 6 cycles (150&#xa0;min). Furthermore, the composite filter material fabricated based on this material exhibited not only outstanding formaldehyde degradation performance but also high PM2.5 interception efficiency (&gt; 99%). This study provides a feasible strategy for developing multifunctional air purification materials combining catalytic oxidation and filtration properties, showing potential application value in indoor air pollution control.</p>

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Controlled Preparation of Coconut Shell-Based Activated Carbon Fiber-Supported Mesoporous δ-MnO₂ and Formaldehyde Decomposition Performance

  • 期刊论文

  • 发表日期：

    2025年12月17日

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  • Xianhua Zhang,
  • Hongyang Sang,
  • Fan Liu,
  • Linlin Du,
  • Hui Zhang,
  • Jinsheng Qiao,
  • Wenbo Fan,
  • Mengyu Yuan

摘要

This study aims to develop the multifunctional air purification material integrating efficient formaldehyde catalytic degradation and PM2.5 interception capabilities by controllably synthesizing coconut shell-based activated carbon fiber loaded with mesoporous δ-MnO₂ (δ-MnO₂@ACF). Using ACF as the substrate, MnO₂ was loaded onto its surface via the hydrothermal method, with systematic investigation of the effects of hydrothermal temperature (90–180 °C), KMnO₄ concentration (0.005–0.05 mol/L) and reaction time (2–8 h) on the morphology and crystal phase of MnO₂. The highly active mesoporous δ-MnO₂@ACF composite was successfully prepared. Characterization techniques including SEM, XRD, and BET confirmed the mesoporous structure of δ-MnO₂ and its uniform loading on ACF. Formaldehyde (HCHO) removal tests demonstrated that δ-MnO₂@ACF achieved the removal efficiency of 92%, maintaining 76% efficiency after 6 cycles (150 min). Furthermore, the composite filter material fabricated based on this material exhibited not only outstanding formaldehyde degradation performance but also high PM2.5 interception efficiency (> 99%). This study provides a feasible strategy for developing multifunctional air purification materials combining catalytic oxidation and filtration properties, showing potential application value in indoor air pollution control.