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<p>Bast fibers—a type of natural cellulose fiber characterized by distinct cavity shapes and surface chemical properties with hierarchical pore structures—like ramie, hemp, and linen—show notable benefits in gas adsorption. Compared to synthetic deodorizing materials, these bio-based fibers offer better biodegradability, renewability, and environmental compatibility. However, systematic research on the odor adsorption effectiveness of different bast fibers is still limited, especially when it comes to the structure–activity relationship between adsorption mechanisms and microstructural features. In this study, we investigate the adsorption behavior and underlying mechanisms of four cellulose fibers—degummed ramie, hemp, linen, and scoured cotton—using ammonia and acetic acid as model odor molecules. A range of multiscale characterization methods, including adsorption kinetic models, scanning electron microscopy (SEM), inverse gas chromatography (IGC), and density functional theory (DFT) were employed in our analysis. Our results reveal that ramie fiber, with its longitudinal grooves and loosely fibrillated structure, exhibits the highest adsorption capacity for ammonia (0.278&#xa0;mg·g<sup>−1</sup>) and acetic acid (2.81&#xa0;mg·g<sup>−1</sup>), attributable to its larger specific surface area (8.96&#xa0;m2·g<sup>−1</sup>) and greater number of active sites Further investigation uncovers a synergistic process involving both chemical and physical adsorption. This study not only offers novel perspectives for development of high-performing, environmentally friendly deodorizing materials but also provides a theoretical basis for utilizing bast fibers in odor-control functional textiles.</p>

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Enhanced adsorption efficacy and mechanistic insights of ammonia and acetic acid on diverse natural fibers

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • Yue Qi,
  • Bingyan An,
  • Peiqi Liu,
  • Shafqat Ali,
  • Quanzhi Hu,
  • Yongming Cui,
  • Yajie Shu,
  • Jinfeng Wang

摘要

Bast fibers—a type of natural cellulose fiber characterized by distinct cavity shapes and surface chemical properties with hierarchical pore structures—like ramie, hemp, and linen—show notable benefits in gas adsorption. Compared to synthetic deodorizing materials, these bio-based fibers offer better biodegradability, renewability, and environmental compatibility. However, systematic research on the odor adsorption effectiveness of different bast fibers is still limited, especially when it comes to the structure–activity relationship between adsorption mechanisms and microstructural features. In this study, we investigate the adsorption behavior and underlying mechanisms of four cellulose fibers—degummed ramie, hemp, linen, and scoured cotton—using ammonia and acetic acid as model odor molecules. A range of multiscale characterization methods, including adsorption kinetic models, scanning electron microscopy (SEM), inverse gas chromatography (IGC), and density functional theory (DFT) were employed in our analysis. Our results reveal that ramie fiber, with its longitudinal grooves and loosely fibrillated structure, exhibits the highest adsorption capacity for ammonia (0.278 mg·g−1) and acetic acid (2.81 mg·g−1), attributable to its larger specific surface area (8.96 m2·g−1) and greater number of active sites Further investigation uncovers a synergistic process involving both chemical and physical adsorption. This study not only offers novel perspectives for development of high-performing, environmentally friendly deodorizing materials but also provides a theoretical basis for utilizing bast fibers in odor-control functional textiles.