Comparison of first-order sorption kinetics using concept of two-site sorption model

Title
Comparison of first-order sorption kinetics using concept of two-site sorption model
Authors
이순재김동주최재우
Keywords
two-site sorption; parallel interface; serial interface; Type-1 site; Type-2 site
Issue Date
2012-11
Publisher
Environmental engineering science
Citation
VOL 29, NO 11, 1002-1007
Abstract
In this study, we compared two different approaches available in the literature for the first order sorption kinetics which constitutes the slow time-dependent part of the two-site sorption model commonly used for solute transport modeling. One assumes that sorbed concentrations in Type-1 site (S1) and Type-2 site (S2) are directly associated with solute concentration (C) in liquid phase by forming two-site sorption with parallel interface (TSPI), and the other assumes that S2 is associated with only S1 at Type-1 site resulting in two-site sorption with serial interface (TSSI). Application of different kinetics to a batch system where solute mass is conserved resulted in an identical type of liquid and sorbed concentration versus time equation in the form of exponential decay. However, due to different structure and components used to define the kinetic part (S2), some parameters estimated from the observed kinetic sorption data were deviated significantly from one to the other. For instance, the fraction (f) of Type-1 site varied as much as two fold, which led to different transport behavior. This indicates that choice of kinetic part in the two-site sorption model becomes important when attempting appropriate transport modeling on a reactive solute.
URI
http://pubs.kist.re.kr/handle/201004/42595
ISSN
10928758
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