- While many authors applied the van't Hoff equation for the calculation of the thermodynamic parameters of the adsorption, but there is widespread misuse of adsorption isotherm constants or distribution coefficient instead of the dimensionless thermodynamic equilibrium constant.
- The following papers have discussed this issue thoroughly, but there is a clear conclusion or compromise:
[78] H.N. Tran, S.-J. You, A. Hosseini-Bandegharaei, H.-P. Chao, Mistakes and inconsistencies regarding adsorption of contaminants from aqueous solutions: a critical review, Water research, 120 (2017) 88-116.
[79] F.-D. Kopinke, A. Georgi, K.-U. Goss, Comment on “Mistakes and inconsistencies regarding adsorption of contaminants from aqueous solution: A critical review, published by Tran et al.[Water Research 120, 2017, 88–116]”, Water research, 129 (2018) 520-521.
[80] X. Zhou, X. Zhou, The unit problem in the thermodynamic calculation of adsorption using the Langmuir equation, Chemical Engineering Communications, 201 (2014) 1459-1467.
[81] E.C. Lima, A. Hosseini-Bandegharaei, J.C. Moreno-Piraján, I. Anastopoulos, A critical review of the estimation of the thermodynamic parameters on adsorption equilibria. Wrong use of equilibrium constant in the Van't Hoof equation for calculation of thermodynamic parameters of adsorption, Journal of Molecular Liquids, 273 (2019) 425-434.
[82] A. Fenti, P. Iovino, S. Salvestrini, Some remarks on “A critical review of the estimation of the thermodynamic parameters on adsorption equilibria. Wrong use of equilibrium constant in the Van't Hoof equation for calculation of thermodynamic parameters of adsorption”-Journal of Molecular Liquids 273 (2019) 425–434, (2019).
[83] E.C. Lima, A. Hosseini-Bandegharaei, I. Anastopoulos, Response to “Some remarks on a critical review of the estimation of the thermodynamic parameters on adsorption equilibria. Wrong use of equilibrium constant in the van't Hoff equation for calculation of thermodynamic parameters of adsorption-Journal of Molecular Liquids 273 (2019) 425–434.”, Journal of Molecular Liquids, 280 (2019) 298-300.
[84] S. Salvestrini, V. Leone, P. Iovino, S. Canzano, S. Capasso, Considerations about the correct evaluation of sorption thermodynamic parameters from equilibrium isotherms, The Journal of Chemical Thermodynamics, 68 (2014) 310-316.
Can anyone help me to reach a solution?
Thanks
Dr Akbar --please take a look at the following useful RG link:
https://www.researchgate.net/post/How-to-calculate-kd-for-vant-hoff-graph
Article A critical review of the estimation of the thermodynamic par...
Thanks, dear ljaz.
I have read this worthwhile paper. But there are still many controversial discussions as you see in my listed references.
You mean the adsorption equilibrium constant, I guess. The problem is not to change the unit to dimensionless, because for many years standard values have been used here, but how to determine the value of this constant correctly. You will not find a clear answer in the cited publications. First of all, analogy to chemical reactions should be sought and try to base on mass-action law, but ....
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