Methylene Blue Sorption onto Oxygenated Pyrolytic Tire Char: Equilibrium and Kinetic Studies
Publication: Journal of Environmental Engineering
Volume 137, Issue 9
Abstract
A novel method is presented for pyrolyzing and activating waste tires for adsorptive removal of aqueous contaminants. The adsorption characteristics of a cationic dye (methylene blue, MB) by pyrolytic tire char were evaluated. Mechanistic insights into the adsorption of MB onto char made from pyrolyzed tires are discussed on the basis of equilibrium and kinetic studies. A comparative evaluation of the performance of unoxygenated, pyrolyzed chars (NoPPO) and oxygenated chars (P550250) is reported. Despite having similar surface areas between the oxygenated and unxoygenated chars, the adsorption capacity of the former was much higher than that of the latter. However, adsorption of MB is thermodynamically unfavorable () although oxygenation lowers the free energy of adsorption. MB sorption onto P550250 is inhibited by an external film, which was not observed in the case of NoPPO. An increase in the solution temperature was found to reduce the adsorption rates of MB onto P550250 but increase the sorption capacity of NoPPO. Overall, oxygenation was found to improve the sorption of MB onto pyrolytic chars.
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Published In
Journal of Environmental Engineering
Volume 137 • Issue 9 • September 2011
Pages: 833 - 841
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Apr 27, 2010
Accepted: Mar 8, 2011
Published online: Mar 10, 2011
Published in print: Sep 1, 2011
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