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Title: Methylene blue sorption onto oxygenated pyrolytic tire char: Equilibrium and kinetic studies
Authors: Quek, A.
Vijayaraghavan, K. 
Balasubramanian, R. 
Keywords: Adsorption
Methylene blue
Waste management
Issue Date: Sep-2011
Citation: Quek, A., Vijayaraghavan, K., Balasubramanian, R. (2011-09). Methylene blue sorption onto oxygenated pyrolytic tire char: Equilibrium and kinetic studies. Journal of Environmental Engineering 137 (9) : 833-841. ScholarBank@NUS Repository.
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 (ΔG>0) 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. © 2011 American Society of Civil Engineers.
Source Title: Journal of Environmental Engineering
ISSN: 07339372
DOI: 10.1061/(ASCE)EE.1943-7870.0000387
Appears in Collections:Staff Publications

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