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Preparation of porous δ-MnO2 in-situ loaded on carbon-doped nanofibers and its formaldehyde removal performance
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AI
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F
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J
王
Y
W
DOI：10.1007/s10853-026-13523-z.png)
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Abstract
En 中文
δ-MnO2 has been recognized as an excellent material for the catalytic oxidation of formaldehyde at room temperature. The preparation of highly active MnO2/fiber composites is of great significance for the development of novel indoor air purification filter media. In this study, a simple and efficient general method for preparing nanofiber-supported δ-MnO2 is proposed. First, carbon nanopowders (CNPs)-doped polyacrylonitrile (PAN) nanofibers were fabricated via electrospinning. Subsequently, δ-MnO2 was grown in situ on the nanofiber surface through a redox reaction under hydrothermal conditions to obtain δ-MnO2@PAN/CNPs nanofiber membranes. The effects of PAN concentration, CNPs doping amount, and MnO2 loading process parameters (reaction temperature, KMnO4 concentration, and time) on the morphology and structure of the materials were systematically optimized. The results showed that under the conditions of 12 wt.% PAN concentration and 2 wt.% CNPs doping amount, after reaction in 0.02 mol/L KMnO4 solution at 120 °C for 4 h, the resulting PAN/CNPs fiber membrane successfully supported a uniform and dense nanoflower-like δ-MnO2 coating. The as-prepared MnO2@PAN/CNPs composite exhibited excellent catalytic degradation performance for formaldehyde at room temperature, achieving 84.1% removal within 95 min, and still maintaining 78.3% degradation efficiency after five cycles. This study provides an effective strategy and theoretical basis for the development of high-performance, easily preparable fiber-based air purification materials.
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