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Characterization of microstructure and surface properties of heat-treated PAN-and rayon-based activated carbon fibers

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Abstract

Polyacrylonitrile- and rayon-based activated carbon fibers (ACFs), subject to heat treatment over 600–1,100°C under N2 flow, were investigated using a number of surface analytical methods, including N2 adsorption isotherm, elemental analysis, and X-ray photoelectron spectroscopy. The adsorption capacities of benzene, carbon tetrachloride, and water vapor on as-received and heat-treated ACFs were determined. Results show that the ACFs under study were highly microporous but heat-treated ACFs contained more mesopores in the range of 20–30 Å for PAN-based and 30–45 Å for rayon-based. It can be seen that the high-resolution αs plot provided valuable information about structure properties. The pore size distributions of ACFs gave insight into the pore development with heat treatment temperature. Besides, phenolic groups were found to be the most abundant oxygen-containing functional groups on the surface of both ACFs. The vapor adsorptions on ACFs indicated that molecular size and polarity of vapors, as well as the microstructure and chemistry of ACFs profoundly influenced the adsorption performance.

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Acknowledgments

The authors thank the Precision Instrument Development Center of the National Science Council and the Yuan Ze Fuel Cell Center for the support of experimental instruments used in this study.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Yuan Ze University, 135 Yuan-Tung Rd., Chung-Li, Taoyuan, 320, Taiwan, ROC

    Yu-Chun Chiang & Hung-Chih Lee

  2. Department of Communications Engineering, Yuan Ze University, 135 Yuan-Tung Rd., Chung-Li, Taoyuan, 320, Taiwan, ROC

    Chien-Cheng Lee

Authors
  1. Yu-Chun Chiang
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  2. Chien-Cheng Lee
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  3. Hung-Chih Lee
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Correspondence to Yu-Chun Chiang.

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Chiang, YC., Lee, CC. & Lee, HC. Characterization of microstructure and surface properties of heat-treated PAN-and rayon-based activated carbon fibers. J Porous Mater 14, 227–237 (2007). https://doi.org/10.1007/s10934-006-9028-8

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  • DOI: https://doi.org/10.1007/s10934-006-9028-8

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