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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 7, No. 2, 2010, pp. 235-242
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Bioline Code: st10023
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 7, No. 2, 2010, pp. 235-242
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Adsorption of methyl tert-butyl ether using granular activated carbon: Equilibrium and kinetic analysis
Chen, D. Z.; Zhang, J. X. & Chen, J. M.
Abstract
The adsorption of methyl tert-butyl ether by granular activated carbon was investigated. The experimental
data were analyzed using the Freundlich isotherm and the Langmuir isotherm. Although equilibrium data were found to
follow Freundlich isotherm model, it were fitted better by the Langmuir model with a maximum adsorption capacity of
204.1 mg/g. The kinetic data obtained at different concentrations were analyzed to predict the constant rate of adsorption
using three common kinetic models: pseudo-first-order, pseudo-second-order equation and intraparticle diffusion
equation. The pseudo-second-order model was suitable for describing the adsorption kinetics for the removal of methyl
tert-butyl ether from aqueous solution onto granular activated carbon. Both the Lagergren first-order rate constant k1
and pseudo-second-order rate constant k2 decrease with increasing initial concentrations of methyl tert-butyl ether and
the intraparticle diffusion rate constant kp shows the reverse characteristic. Analysis of sorption data using a boyd plot
confirmed that external mass transfer is the main rate-limiting step at the initial stage of adsorption. Results illustrate
that granular activated carbon is an effective adsorbent for methyl tert-butyl ether and also provide specific guidance
into adsorption of methyl tert-butyl ether on granular activated carbon in contaminated groundwater.
Keywords
Adsorption equilibrium; Intraparticle diffusion model; Mechanism; Modeling
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