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

被引：1395

作者：

Lima, Eder C. ^{[1
]}

Hosseini-Bandegharaei, Ahmad ^{[2
,3
]}

Moreno-Pirajan, Juan Carlos ^{[4
]}

Anastopoulos, Ioannis ^{[5
]}

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

来源：

JOURNAL OF MOLECULAR LIQUIDS | 2019年 / 273卷

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.

引用

页码：425 / 434

页数：10

共 57 条

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