How does mechanism of biosorption determine the differences between the initial and equilibrium adsorption states?

Abstract

The analysis of various models assumed to represent the influence of pH on heavy metals biosorption equilibrium is presented. It shows that all of them lead to the same mathematical expressions (e.g. the Langmuir or the Flory adsorption isotherm equations) when the pH effects are neglected. Even if considering the pH effects, some of them (competitive adsorption and ion-exchange models, for instance) still lead to analogical expressions for sorption isotherm equations. The accepted mechanism of biosorption may, however, influence strongly the differences between the initial and equilibrium states of biosorption system. Keywords

Modeling the Effect of pH on Kinetics of Heavy Metal Ion Biosorption. A Theoretical Approach Based on the Statistical Rate Theory

“…This issue has been explained in a more detailed way in one of our previous papers . Also, very recently, some quantitative studies have been performed concerning this problem on the grounds of the SRT approach . Choosing 15 min of time was a compromise between having a substantial enough amount of data and the accuracy of the determination of N e values.…”