期刊
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
卷 41, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colcom.2021.100376
关键词
Solid-liquid interface; Adsorption isotherms; Chemisorption; Physisorption
资金
- SGCyT-UNS
- ANPCYT-MINCYT
- CONICET
This paper evaluates the validity of the D-R equation in defining the binding mode of ions and molecules at the solid-water interface, revealing that the outcome of chemical or physical adsorption is influenced by the units of solute concentration in solution.
Defining the binding mode of ions and molecules at the solid-water interface is a key step to predict their reactivity. The Dubinin-Radushkevich (D-R) equation has been used in thousands of investigations to define if there is chemical or physical adsorption on solid surfaces from water. This paper evaluates the validity of the D-R equation to achieve this purpose. It is acknowledged that, either chemical or physical, the adsorption from solution is always an exchange of molecules or ions and thus enthalpy and free energy changes can take very small or nearly zero values. Therefore, characteristic energy values obtained from the D-R equation cannot be used as indicative of the adsorption mode. It is shown for the first time that the application of the equation always leads to chemical binding when molar units are used for the solute concentration in solution, and to physical binding when mg/L units are used.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据