Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 396, Issue -, Pages 29-34Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2011.12.026
Keywords
Adsorption; Sorbent concentration effect; Distribution phenomena; Partition coefficient
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Funding
- Taishan Scholar Foundation of Shandong Province of China [ts20070713]
- National Key Basic Research Program of China [2004CB418504]
- Natural Science Foundation of Shandong Province of China [Z2008B08]
- Graduate Independent Innovation Foundation of Shandong University [yzc10112]
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During studying the distribution of pollutants between the aqueous and particulate phases, an anomalous C-s-effect phenomenon, namely, the experimentally measured partition coefficient (K-p) value of a given system decreased with increasing the sorbent concentration (C-s), was observed in a number of adsorption systems. Classical Langmuir model cannot predict the C-s-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 C-s because of the existence of adsorbent particle-particle interactions. A semi-empirical C-s-dependent function of partition coefficient was derived, and it can predict the C-s-dependence of partition coefficient for both organic compounds and heavy metals. (C) 2011 Elsevier B.V. All rights reserved.
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