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Competitive adsorption and desorption of a bi-solute mixture: effect of activated carbon type

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Abstract

This study aims to clarify the effects of carbon activation type and physical form on the extent of adsorption capacity and desorption capacity of a bi-solute mixture of phenol and 2-chlorophenol (2-CP). For this purpose, two different PACs; thermally activated Norit SA4 and chemically activated Norit CA1, and their granular countertypes with similar physical characteristics, thermally activated Norit PKDA and chemically activated Norit CAgran, were used. The thermally activated carbons were better adsorbers for phenol and 2-CP compared with chemically activated carbons, but adsorption was more reversible in the latter case. 2-CP was adsorbed preferentially by each type of activated carbon, but adsorption of phenol was strongly suppressed in the presence of 2-CP. The simplified ideal adsorbed solution (SIAS) model underestimated the 2-CP loadings and overestimated the phenol loadings. However, the improved and modified forms of the SIAS model could better predict the competitive adsorption. The type of carbon activation was decisive in the application of these models. For each activated carbon type, phenol was desorbed more readily in the bi-solute case, but desorption of 2-CP was less compared with single-solute. This was attributed to higher energies of 2-CP adsorption.

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  1. Boğaziçi University Institute of Environmental Sciences, 34342, Bebek İstanbul, Turkey

    Özgür Aktaş & Ferhan Çeçen

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  1. Özgür Aktaş
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  2. Ferhan Çeçen
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Correspondence to Özgür Aktaş.

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Aktaş, Ö., Çeçen, F. Competitive adsorption and desorption of a bi-solute mixture: effect of activated carbon type. Adsorption 13, 159–169 (2007). https://doi.org/10.1007/s10450-007-9017-5

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  • DOI: https://doi.org/10.1007/s10450-007-9017-5

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