External mass transfer during the adsorption of various pollutants onto activated carbon |
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| Authors: | Gordon McKay Murad J. Bino A. Altememi |
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| Affiliation: | 1. Harvard University, School of Engineering and Applied Sciences, Cambridge, MA, United States;2. Harvard University, Department of Chemistry and Chemical Biology, Cambridge, MA, United States;1. Department of Chemical Engineering, National Taiwan University of Science and Technology, 43, Keelung Road, Sec. 4, Taipei 106, Taiwan;2. Institute of Biomedical Engineering, National Yang-Ming University, 155 Li-Nung St., Sec. 2, Taipei 112, Taiwan |
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| Abstract: | A wide range of experimental studies are reported for the adsorption of phenol and p-chlorophenol onto activated carbon—Type Filtrasorb 400—in an agitated batch adsorber. A model has been used to determine the external mass transfer coefficient for the systems and the effect of several experimental variables have been investigated: these include agitation, initial pollutant concentration, carbon mass, carbon particle size and solution temperature. The mass transfer coefficient has been correlated in terms of the dimensionless Sh/Sc0.33 against each variable. The Sherwood number, Sh = kfR/Dmol, relates the external mass transfer coefficient kf to particle radius, R, and molecular diffusivity, Dmol. The Schmidt number, Sc, is the ratio of kinematic viscosity, v, to molecular diffusivity. A few results are also reported for the adsorption of sodium dodecyl sulphate and mercuric ions onto activated carbon. |
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| Keywords: | adsorption activated carbon phenol p-chlorophenol mercury sodium dodecyl sulphate mass transfer |
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