Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 273, Issue -, Pages 425-434Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molliq.2018.10.048
Keywords
Equilibrium constant; Van't Hoof equation; Thermodynamic parameters of adsorption; Isotherm models
Funding
- National Council for Scientific and Technological Development (CNPq, Brazil)
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In the adsorption literature, the Van't Hoff equation is used in different manners without any criteria about the concepts of physical-chemistry of equilibrium for calculation of thermodynamic parameters of adsorption. Indeed, the equilibrium constant (K) should be dimensionless for being used in the Van't Hoff equation. However, this is not a simple adjustment of units, as being spread in the literature, to become K dimensionless. In this paper, it will be calculated the equilibrium constants using numeric examples and show the flaws of the thermodynamics calculations, when the value of K is wrongly calculated, and what are the expected results of the changes in enthalpy (Delta H degrees) and changes in the entropy (Delta S degrees) that are spread in the literature. (C) 2018 Published by Elsevier B.V.
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