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Ionic surfactant adsorption onto activated carbons

The adsorption of sodium dodecyl sulfate onto a set of activated carbons from aqueous solutions has been studied in the low concentration range. The adsorption isotherms are reasonably well fitted by a double Langmuir equation but the calorimetry of adsorption enthalpies shows a rather wide distribu...

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Published in:	Journal of colloid and interface science 2004-10, Vol.278 (2), p.257-264
Main Authors:	González-García, C.M., González-Martín, M.L., Denoyel, R., Gallardo-Moreno, A.M., Labajos-Broncano, L., Bruque, J.M.
Format:	Article
Language:	English
Subjects:	Activated carbons Adsorbents Adsorption Chemistry Exact sciences and technology General and physical chemistry Interfacial free energy Ionic surfactant Langmuir equation Surface physical chemistry
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container_end_page	264
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container_title	Journal of colloid and interface science
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creator	González-García, C.M. González-Martín, M.L. Denoyel, R. Gallardo-Moreno, A.M. Labajos-Broncano, L. Bruque, J.M.
description	The adsorption of sodium dodecyl sulfate onto a set of activated carbons from aqueous solutions has been studied in the low concentration range. The adsorption isotherms are reasonably well fitted by a double Langmuir equation but the calorimetry of adsorption enthalpies shows a rather wide distribution of energies. This distribution is related to direct adsorbate–adsorbent interactions in pores of different size, without noticeable contributions from the chemical nature of the surface. The adsorbate–adsorbent interaction free energy through water is evaluated using the model proposed by van Oss and co-workers for the interfacial free energy. The obtained results indicate that the calculated free energy is in good agreement with that found from application of the double Langmuir equation to the adsorption isotherms.
doi_str_mv	10.1016/j.jcis.2004.06.012
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subjects	Activated carbons Adsorbents Adsorption Chemistry Exact sciences and technology General and physical chemistry Interfacial free energy Ionic surfactant Langmuir equation Surface physical chemistry
title	Ionic surfactant adsorption onto activated carbons
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