Formaldehyde removal by Rayon-based activated carbon fibers modified by <Emphasis Type="Italic">P</Emphasis>-aminobenzoic acid |
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| Authors: | Haiqin Rong Zhenyu Liu Qilin Wu Ding Pan Jingtang Zheng |
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| Institution: | (1) College of Material Science and Engineering, Donghua University, 200051 Shanghai, China;(2) Library Information Center, Donghua University, 200051 Shanghai, China;(3) Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261, USA;(4) State Key Laboratory for Modification of Chemical Fibers & Polymer Materials, Donghua University, 200051 Shanghai, China;(5) Department of Textile & Clothing, University of California, Davis, CA 95616, USA;(6) State Key Laboratory of Heavy Oil Processing, China University of Petroleum, 257061 Dongying, China; |
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| Abstract: | We impregnated Rayon-based activated carbon fibers (ACFs) by p-aminobenzoic acid (PABA) and systematically investigated their porous structure, surface chemistry, and formaldehyde removal
behavior. Using standard nitrogen adsorption analysis, we found that the specific surface area, the micropore volume, and
the total pore volume decreased with increasing concentration of PABA. Through elemental analysis and X-ray photoelectron
spectroscopy, it was found that some nitrogen-containing functional groups presented on the surface of modified Rayon ACFs.
The modified Rayon-based ACFs showed much higher adsorption capacity and longer breakthrough time for formaldehyde than did
as-prepared Rayon-based ACF. We proposed that the improvement of formaldehyde removal by modified ACFs was attributed to the
combined effects of physisorption contributed by pore structures and chemisorption contributed by the N-containing functional
groups, whereas there was only physisorption between the as-prepared ACF and formaldehyde molecules. |
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