کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5210882 1382924 2009 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sorption of selenium species onto weakly basic anion exchangers: I. Equilibrium studies
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Sorption of selenium species onto weakly basic anion exchangers: I. Equilibrium studies
چکیده انگلیسی

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-/Cl-/NO3- and SeO32-/SeO42-/NO3-) and quaternary systems (SeO32-/SeO42-/Cl-/NO3-) can be well correlated.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Reactive and Functional Polymers - Volume 69, Issue 8, August 2009, Pages 576-585
نویسندگان
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