Kinetics and mechanism of the adsorption of methylene blue onto ACFs

The kinetics and mechanism of methylene blue (MB) adsorption onto activated carbon fibers (ACFs) have been studied. The effects of various experimental parameters, such as the initial MB concentration and the ACF mass, on the adsorption rate were investigated. Equilibrium data were fit well by a Fre...

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Bibliographic Details
Published inJournal of China University of Mining and Technology Vol. 18; no. 3; pp. 437 - 440
Main Author YANG, Zhi-yuan
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.09.2008
Subjects
ACFs
equilibrium
mechanism
methylene blue
sorption
ACFs
methylene blue
equilibrium
mechanism
sorption
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Summary:The kinetics and mechanism of methylene blue (MB) adsorption onto activated carbon fibers (ACFs) have been studied. The effects of various experimental parameters, such as the initial MB concentration and the ACF mass, on the adsorption rate were investigated. Equilibrium data were fit well by a Freundlich isotherm equation. Adsorption measurements show that the process is very fast. The adsorption data were modeled using first- and second-order kinetic equations and intra-particle diffusion models. It was found that the first-order kinetic equation could best describe the adsorption kinetics. The adsorption process was found to be complex and controlled by both surface and pore diffusion with surface diffusion at the earlier stages, followed by pore diffusion at the later stages. The thermodynamic parameters ΔG 0, ΔS 0 and ΔH 0, have been calculated. The thermodynamics of the MB-ACF system indicate that the adsorption process is spontaneous.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1006-1266
DOI:10.1016/S1006-1266(08)60090-5