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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. 4, 2010, pp. 793-800
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Bioline Code: st10078
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. 4, 2010, pp. 793-800
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Lead removal from wastewater using fluted pumpkin seed shell activated carbon: Adsorption modeling and kinetics
Okoye, A.I.; Ejikeme, P.M. & Onukwuli, O.D.
Abstract
Activated carbon produced from fluted pumpkin (Telfairia occidentalis) seed shell was utilized for the
removal of lead (II) ion from simulated wastewater. Adsorption tests were carried out in series of batch adsorption
experiments. Several kinetic models (Bhattacharya-Venkobacher, Elovich, pseudo first and second order, intra-particle
and film diffusion) were tasted for conformity to the experimental data obtained. The Langmuir and Freundlich adsorption
models were also used to test the data. The amount of lead (II) ion adsorbed at equilibrium from a 200
mg/L solute concentration was 14.286 mg/g. The experimental data conform very well to the pseudo-second order
equation where equilibrium adsorption capacities increased with increasing initial lead (II) concentration. The rate of the
adsorption process was controlled by the film (boundary layer) diffusion as the film diffusion co-efficient values
obtained from data analysis were of the order of 106cm2/s. From the plots, the linear regression coefficient (R2) of the
Langmuir model was higher than that of the Freundlich: the adsorption isotherm obeyed the Langmuir model better than
the Freundlich model.
Keywords
Film diffusion; Intraparticle diffusion; Isotherm; Kinetic model; Lead (II) ions; Sorption; Telfairia occidentalis
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