Kapok-Derived Super Hollow Porous Carbon Fibers and Their Greenhouse Gases Adsorption
Industrialization and modernization have significantly improved the quality of life but have also led to substantial pollution. Cost-effective technologies are urgently needed to mitigate emissions from major polluting sectors, such as the automotive and transport industries. In this study, we synth...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-07-01
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| Series: | Fibers |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-6439/13/7/92 |
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| Summary: | Industrialization and modernization have significantly improved the quality of life but have also led to substantial pollution. Cost-effective technologies are urgently needed to mitigate emissions from major polluting sectors, such as the automotive and transport industries. In this study, we synthesized naturally derived, kapok-based porous carbon fibers (KP-PCFs) with hollow structures. We investigated their adsorption/desorption behavior for the greenhouse gas n-butane following ASTM D5228 standards. Scanning electron microscopy and X-ray diffraction analyses were conducted to examine changes in fiber diameter and crystalline structure under different activation times. The micropore properties of KP-PCFs were characterized using Brunauer–Emmett–Teller, <i>t</i>-plot, and non-localized density functional theory models based on N<sub>2</sub>/77K adsorption isotherm data. The specific surface area and total pore volume ranged from 500 to 1100 m<sup>2</sup>/g and 0.24 to 0.60 cm<sup>3</sup>/g, respectively, while the micropore and mesopore volumes were 0.20–0.45 cm<sup>3</sup>/g and 0.04–0.15 cm<sup>3</sup>/g, respectively. With increasing activation time, the n-butane adsorption capacity improved from 62.2% to 73.5%, whereas retentivity (residual adsorbate) decreased from 6.0% to 1.3%. The adsorption/desorption rate was highly correlated with pore diameter: adsorption capacity was highest for diameters of 1.5–2.5 nm, while retentivity was greatest for diameters of 3.5–5.0 nm. |
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| ISSN: | 2079-6439 |