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Demonstrates enhanced ammonia capture in industrial processes using carbon nanofibers, indicating their potential for better separation technologies.
High Resolution Image Download MS PowerPoint Slide Polyacrylonitrile-based carbon nanofibers (PAN-based CNFs) have potential as tunable adsorbents for NH 3 capture from industrial processes, with adsorbent properties controlled by the carbonization temperature. Fibers prepared by electrospinning and carbonized between 800 and 1000 °C were characterized by NH 3 adsorption isotherms at 25 and 50 °C and equilibration curves at 50 and 100 mbar. The NH 3 uptake showed that pore architecture, rather than surface composition, primarily governs both adsorption kinetics and capacity. High affinity toward NH 3 and Type I isotherms were observed for samples carbonized at 800 and 850 °C, associated with specific ultramicropores that provide strong physisorption, as confirmed by the isosteric heat of adsorption. Increasing carbonization temperature reduced pore accessibility, leading to diffusion limitations and lower NH 3 uptake. These findings demonstrate that PAN-based CNFs offer tunable adsorption behavior through control of carbonization temperature and could be used for NH 3 separation and purification at ambient conditions in industrial applications.
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Metschan et al. (2026) studied this question.
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