Journal
CHEMICAL ENGINEERING COMMUNICATIONS
Volume 196, Issue 7, Pages 824-840Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00986440802668232
Keywords
Enthalpy variation; Entropy variation; Gibbs free energy variation; Organic acids
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In this study, the adsorption of some organic acids from aqueous solutions on modified and unmodified montmorillonite clays was carried out as a function of temperature and initial concentration of the adsorbate, through adsorption isotherms and their thermodynamic parameters (S, H, and G). The results showed that the adsorption capacity of the adsorbents increased with the concentration, at constant temperature, and decreased with the increase of temperature, at constant concentration. The negative values of G and H showed that the adsorption was a spontaneous and exothermic process. In general the experimental data were well represented by the Langmuir and Freundlich isotherms models.
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