期刊
ADSORPTION SCIENCE & TECHNOLOGY
卷 36, 期 1-2, 页码 441-457出版社
SAGE PUBLICATIONS INC
DOI: 10.1177/0263617417700635
关键词
Natural fibers; natural fiber-derived activated carbon adsorbents; chemical activation; mesoporous activated carbon adsorbents; physical adsorption
资金
- NSF-EPSCoR [EPS-1158862]
- Deep South Center, Pilot Project Research from NIOSH [2T42OH008436]
- Center for Forest Sustainability, Auburn University
The first aim of this study was to investigate mesoporous activated carbon adsorbents from sisal, hemp, and flax fibers by cost-effective methods. Fibers were impregnated with low concentration (20 wt.%) phosphoric acid. Carbonization temperatures were defined by thermal analysis. Bast fibers (hemp, flax) decompose at lower temperatures (419.36 degrees C, 434.96 degrees C) than leaf fibers (sisal, 512.92 degrees C). The second aim was to compare bast and leaf fibers-derived activated carbon adsorbents by determining physical adsorption properties, chemical compositions, scanning electron microscope, and Fourier transform infrared spectroscopy. Results showed that natural fibers have good candidates to prepare mesoporous activated carbon adsorbents with high surface area (1186-1359 m(2)/g), high mesopore percentage (60-72%), and high C content (80-86%). Even though leaf-derived activated carbon developed more mesoporous structure (72%), bast-derived activated carbons provided higher surface areas (S-hemp=1359 m(2)/g; S-flax=1257 m(2)/g) and C content. Fourier transform infrared spectra for bast fibers-derived activated carbon adsorbents were quite similar while leaf fiber-derived activated carbon adsorbent had a different spectrum.
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