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Liquid—solid adsorption from binary component mixture
Author(s) -
Geng XinPeng,
Geng XinDu
Publication year - 1993
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19930110501
Subject(s) - adsorption , chemistry , freundlich equation , partition coefficient , thermodynamics , stoichiometry , langmuir , binary number , ideal solution , component (thermodynamics) , partition (number theory) , displacement (psychology) , chromatography , mathematics , psychology , physics , arithmetic , combinatorics , psychotherapist
Based on five thermodynamic equilibria among the components I, II, and adsorbent, a stoichiometric displacement model of adsorption (SDM‐A) from binary liquid mixture with complete range of concentration in liquid‐solid system is proposed and tested by using data published in literatures. The two expressions of this model show the quantitative relationships between the activity of the component I on the surface and that in the bulk solution and between its partition coefficient in two phases and its equilibrium activity in bulk solution, respectively. In some cases, the two expressions may become two linear equations, from which the correspondingly linear slopes (i.e. the adsorption parameters) are obtained with which the stoichiometric displacement relation and relative adsorption ability between components I and II can be elucidated. The effectiveness of these two expressions for different adsorption systems and the similarity and difference between SDM‐A and the Freundlich Empirical Equation are also investigated. A rule illustrating a parallel relationship between 2 n/Z and the property of bulk solution is also found. And, having studied the quantitative relation of the adsorption from either ideal or non‐ideal liquid mixture and compaired their linear adsorption parameters, we find that SDM‐A is much better than the Langmuir's.