Physical adsorption on solids: thermodynamic aspects

Quimica nova

Paternina, Elihu¹  Barragán, Daniel¹  Arias, Juan Miguel¹ 

[1] Universidad Nacional de Colombia, Bogotá, Colombia

关键词: physical adsorption;    Gibbs isotherm;    isosteric enthalpy.;   

DOI  :  10.1590/S0100-40422009000500046

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

A thermodynamic formalism based on the Gibbs Dividing Surface (GDS) for the description of a solid-fluid interface is presented, so that the adsorption layer is understand as a phase and the adsorption process as the transference of components between a 3-dimensional phase and a 2-dimensional one. Using a state equation derived from the Henry's Law, we shall show how the Langmuir isotherm is deduced from de Gibbs isotherm. The GDS is useful also for understanding the release of heat by a system as the adsorption occurs.

【 授权许可】

CC BY