Porous carbon fibers prepared from cellulose
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A series of porous carbon microfibers has been prepared by controlled carbonization of cellulose precursors. Their surface area determined by the BET method from argon absorption ranges from about 1 to almost 1500 m2 g−1. The pore sizes of fibers determined with help of positron annihilation lifetime spectroscopy are in the range below 1 nm. Dried samples of the resulting material were imbued with water in order to characterize their water sorption abilities. Amount of absorbed water was precisely determined by thermogravimetry. Carbon fibers filled with water were analyzed with differential scanning calorimetry and positron annihilation lifetime spectroscopy. It has been shown that water sorption abilities of fibers are not simply proportional to their surface area; there exists a significant impact of other factors.
KeywordsPorous carbon fibers Thermogravimetry DSC Positron annihilation lifetime spectroscopy
The authors thank Dipl.-Ing. D. Kečkéšová for performing the XRD analysis. The work was partially supported by the Slovak Grant Agencies VEGA (Project 2/0127/17) and APVV (Project 16-0369).
- 3.Novák I, Berek D., Munka K, Varga S, Karácsonyová M. Method of preparation of composite sorbents for removal of contaminants from water. Slovak Patent 288563-2018.Google Scholar
- 5.Novák I, Berek D. Method for preparation of microporous fibrous carbon from cellulosic precursors. Slovak Patent 288507-2017.Google Scholar