Journal
ENVIRONMENTAL POLLUTION
Volume 158, Issue 5, Pages 1669-1674Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2009.12.003
Keywords
Adsorption; Chlorophenol; Activated carbon; Intraparticle diffusion model; Textural characteristics
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Funding
- Research Grants Council (RGC) of Hong Kong SAR
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Batch adsorption experiments were carried out to study the adsorptive removal and diffusion mechanism of para-chlorophenol (p-CP) onto Calgon Filtrasorb 400 (F400) activated carbon. The external mass transfer resistance is negligible in the adsorption process carried out under different conditions in batch operation. Intraparticle diffusion model plots were used to correlate the batch p-CP adsorption data; three distinct linear sections were obtained for every batch operation. The textural properties of F400 activated carbon showed that it has a large portion of supermicropores, which is comparable to the size of the p-CP molecules. Due to the stronger interactions between p-CP molecules and F400 micropores, p-CP molecules predominantly diffused and occupied active sites in micropore region by hopping mechanism, and eventually followed by a slow filling of mesopores and micropores. This hypothesis is proven by the excellent agreement of the intraparticle diffusion model plots and the textural properties of F400 activated carbon. (C) 2009 Elsevier Ltd. All rights reserved.
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