Determination of adsorptive properties of clay/water system: methylene blue sorption

In this study, adsorption of methylene blue onto clay was investigated. The effect of adsorption time and temperature on the adsorption process was studied. To reveal the adsorptive characteristics of the clay studied, porosity and BET surface area measurements were made. It was observed that the ad...

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Bibliographic Details
Published in:Journal of colloid and interface science 2004-01, Vol.269 (2), p.310-314
Main Authors: Gürses, A, Karaca, S, Doğar, Ç, Bayrak, R, Açıkyıldız, M, Yalçın, M
Format: Article
Language:English
Subjects:
Adsorption
Adsorption isotherms
Chemistry
Clay
Exact sciences and technology
General and physical chemistry
Methylene blue
Solid-liquid interface
Surface physical chemistry
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Summary:In this study, adsorption of methylene blue onto clay was investigated. The effect of adsorption time and temperature on the adsorption process was studied. To reveal the adsorptive characteristics of the clay studied, porosity and BET surface area measurements were made. It was observed that the adsorption capacity decreases with increasing temperature, and adsorption equilibrium was attained within 1 h. It was found that the data fit well to Langmuir, Halsey, Henderson, and Harkins–Jura models but experimental data deviate significantly from BET and Freundlich models at especially high concentrations. Furthermore, isosteric adsorption enthalpy and entropy are calculated as −7.99 kJ mol −1 and 25.41 J K −1 mol −1, respectively.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2003.09.004