Journal
CHEMICAL ENGINEERING JOURNAL
Volume 153, Issue 1-3, Pages 1-8Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2009.04.042
Keywords
Adsorption kinetics; Intraparticle diffusion model; Initial adsorption factor; Activated carbon
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Funding
- National Science Council [NSC 96-2221-E-239-021]
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The intraparticle diffusion model (IPD) proposed by Weber and Morris has been widely applied for the analysis of adsorption kinetics. In this work, the characteristic curves based on this model were plotted with various initial adsorption factors (R-i). Four zones of the initial adsorption according to Ri value from 0 to 1 were classified: that is, approaching completely initial adsorption (zone 4), strongly initial adsorption (zone 3), intermediately initial adsorption (zone 2), and weakly initial adsorption (zone 1). Activated carbons with micropore volume fraction of 0.537 and 0.686 were prepared from oil-palm shells by steam activation. Based on the standard deviations, the kinetics of the adsorption of tannic acid (TA), methylene blue (MB), phenol, and 4-chlorophenol (4-CP) on activated carbons could be best described by intraparticle diffusion model. The initial adsorption of TA and MB belonged to zone 2, and that of phenol and 4-CP mostly belonged to zone 3. Nearly 80% of the 86 adsorption systems surveyed belonged to zones 2 and 3, indicating that the R-i value was smaller when the carbon with smaller particle and steam-activated carbon was used. (C) 2009 Published by Elsevier B.V.
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