Journal
CHEMICAL ENGINEERING JOURNAL
Volume 200, Issue -, Pages 133-139Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2012.06.044
Keywords
Hydrophobic coating; Activated carbon fiber; Selectivity; Toluene adsorption; Volatile organic compounds
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Funding
- Agency for Defense Development through Chemical and Biological Defense Research Center
- Korea ministry of Environment as The Eco-Innovation Project
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The toluene adsorption and desorption behavior of bare activated carbon fibers (ACFs) and those with a thin hydrophobic coating were studied. ACF surfaces were made hydrophobic by evaporating polydimethylsiloxane (PDMS) on AFCs under atmospheric pressure condition. In the breakthrough curve of bare-ACF for toluene under humid air condition, the roll-up phenomenon towards toluene adsorption was observed. This was attributed to the substitution of the adsorbed toluene by water on ACF, leading to a rise of outlet concentration above the inlet concentration with a decrease in the amount of adsorbed toluene. Compared to bare-ACF, a superior selectivity and adsorption capacity for toluene was observed on the ACFs coated with PDMS. It is suggested that the PDMS-coating can increase the removal efficiency of ACF for toluene under humid air condition. (C) 2012 Elsevier B.V. All rights reserved.
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