期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 367, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.molliq.2022.120442
关键词
Langmuir isotherm; Adsorption; Adsorption Gibbs energy; Corrosion inhibitor; Plant extract; Metal
资金
- National Natural Science Foundation of China [21873026, 22173028]
In this study, the relationship between Langmuir adsorption coefficients and Gibbs free energy change is derived in detail, and the applicable conditions for correct application and avoiding misuse are analyzed and discussed.
To explore the inhibition mechanism of corrosion inhibitors for metals in aqueous solution, the Langmuir adsorption isotherm has been widely used to ascertain the adsorption mode of the inhibitors on the metal surface. Meanwhile the obtained Langmuir adsorption coefficients have been further applied to calculate Gibb free energy change in the adsorption processes. However, the relationship between the Langmuir adsorption coefficients and Gibbs free energy change of adsorption has been misused for plant extracts (as inhibitors) whose composition and/or content were unknown. Herein, the relationship between the Langmuir adsorption coefficients and Gibbs free energy change is derived detailedly. And the applicable conditions of the relationship are analyzed and discussed for correct application and avoiding misuse. (C) 2022 Elsevier B.V. All rights reserved.
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