| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 594283 | Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2012 | 6 Pages |
During studying the distribution of pollutants between the aqueous and particulate phases, an anomalous Cs-effect phenomenon, namely, the experimentally measured partition coefficient (Kp) value of a given system decreased with increasing the sorbent concentration (Cs), was observed in a number of adsorption systems. Classical Langmuir model cannot predict the Cs-effect. In this paper, a surface component activity (SCA) model was proposed, which suggests that surface component (adsorption site or adsorbed solute) activity coefficient is a function of Cs because of the existence of adsorbent particle–particle interactions. A semi-empirical Cs-dependent function of partition coefficient was derived, and it can predict the Cs-dependence of partition coefficient for both organic compounds and heavy metals.
Graphical abstractA surface component activity model was proposed to predict the sorbent concentration (Cs) dependence of partition coefficient, and a semi-empirical Cs-dependent function of partition coefficient was derived.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A surface component activity (SCA) model to describe the Cs-effect of partition coefficient was proposed. ► A semi-empirical Cs-dependent function of partition coefficient was derived. ► The function can predict the Cs-dependence of partition coefficient for both organic compounds and heavy metals.
