Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 260, Issue 2, Pages 259-264Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/S0021-9797(02)00081-4
Keywords
activated carbon; pitch; pore structures; adsorption properties; surface properties
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The present study concerns the physical activation and chemical oxidation of pitch-based activated carbon fibers (ACFs) as ways to improve the adsorption properties. The surface oxides of the ACFs studied were determined by Boehm's titration and the pore structures were studied by the BET method with N-2/77 K adsorption. Also, the adsorption properties of the ACFs were investigated with chromium ion adsorption by different adsorption models. As a result, it was observed that carboxyl groups were largely created after nitric acid treatment on ACFs. The affinity for chromium ions increases with increasing specific surface area, micropore volume, and surface functionalities of ACFs as the activation time increases. (C) 2003 Elsevier Science (USA). All rights reserved.
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