Sorption of selenium species onto weakly basic anion exchangers: I. Equilibrium studies

被引：12
|
作者：
Erosa, M. S. Dzul [2 ]
Hoell, W. H. [1 ]
Horst, J. [3 ]
机构：
[1] Forschungszentrum Karlsruhe, Inst Funct Interfaces, D-76021 Karlsruhe, Germany
[2] Univ Autonoma Yucatan, Fac Quim, Merida, Yucatan, Mexico
[3] Fader Umweltanalyt, D-76227 Karlsruhe, Germany
来源：
REACTIVE & FUNCTIONAL POLYMERS | 2009年 / 69卷 / 08期
关键词：
Selenium species; Ion exchange; Weakly basic anion exchanger; Surface complexation model; COMPLEX-FORMATION MODEL; RESINS;
D O I：
10.1016/j.reactfunctpolym.2009.03.013
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The surface complexation model has been applied to the description of the sorption equilibrium of selenium species onto weakly basic anion exchangers. Considering local equilibria, logarithmic equilibrium parameters (generalized separation factors) can be deduced by measuring pH values and equilibrium concentrations. The generalized separation factors can be plotted as a function of the dimensionless loadings of the resin phase. By this means a set of two equilibrium constants is obtained for the uptake of each component. The major advantage of this theoretical approach is that these constants remain unchanged in multicomponent systems. Evaluation of experiments with two commercially available weakly basic anion exchangers demonstrate the validity of the approach. The equilibrium of binary (SeO32-, NO3- or SeO42-, NO3-), ternary (SeO32- /Cl-/NO3-, SeO42-/NO3- and SeO32-/SeO42-/NO3-) and quaternary systems (SeO32-/SeO42-/Cl-/NO3-) can be well correlated. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码：576 / 585
页数：10
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