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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
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作者:

Lima, Eder C.
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Fed Univ Rio Grande Sul UFRGS, Lab Environm Technol & Analyt Chem Latama, Inst Chem, Av Bento Goncalves 9500,Postal Box 15003, BR-91501970 Porto Alegre, RS, Brazil Fed Univ Rio Grande Sul UFRGS, Lab Environm Technol & Analyt Chem Latama, Inst Chem, Av Bento Goncalves 9500,Postal Box 15003, BR-91501970 Porto Alegre, RS, Brazil

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Moreno-Pirajan, Juan Carlos
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机构:
Univ Andes, Dept Chem, Bogota, Colombia Fed Univ Rio Grande Sul UFRGS, Lab Environm Technol & Analyt Chem Latama, Inst Chem, Av Bento Goncalves 9500,Postal Box 15003, BR-91501970 Porto Alegre, RS, Brazil

Anastopoulos, Ioannis
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Univ Patras, Dept Chem Engn, LBEET, Patras 26504, Greece Fed Univ Rio Grande Sul UFRGS, Lab Environm Technol & Analyt Chem Latama, Inst Chem, Av Bento Goncalves 9500,Postal Box 15003, BR-91501970 Porto Alegre, RS, Brazil
机构:
[1] Fed Univ Rio Grande Sul UFRGS, Lab Environm Technol & Analyt Chem Latama, Inst Chem, Av Bento Goncalves 9500,Postal Box 15003, BR-91501970 Porto Alegre, RS, Brazil
[2] Sabzevar Univ Med Sci, Fac Hlth, Dept Environm Hlth Engn, Sabzevar, Iran
[3] Islamic Azad Univ, Dept Engn, Kashmar Branch, POB 161, Kashmar, Iran
[4] Univ Andes, Dept Chem, Bogota, Colombia
[5] Univ Patras, Dept Chem Engn, LBEET, Patras 26504, Greece
关键词:
Equilibrium constant;
Van't Hoof equation;
Thermodynamic parameters of adsorption;
Isotherm models;
FREE-ENERGY CHANGE;
ACID RED 1;
AQUEOUS-SOLUTION;
EFFICIENT REMOVAL;
ACTIVATED CARBON;
LIQUID-PHASE;
KINETICS;
ADSORBENT;
BIOSORPTION;
DYE;
D O I:
10.1016/j.molliq.2018.10.048
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
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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页码:425 / 434
页数:10
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