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Na+/Cu2+ ion exchange equilibrium on Zeolite A: a thermodynamic study

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Abstract

The ion exchange isotherms at 302 K for Na+/Cu2+ and Cu2+/Na+ on zeolite A were determined for six total equivalent concentrations of the external solution, in the range 0.05–2.1 eq/L. Interpolated points from the curves fitted with different isotherms were used in the calculation of the selectivity coefficients. The activity coefficients in the external solution were calculated by means of the Pitzer model. Thermodynamic equilibrium constant values corresponding to different total concentrations of the external solution have been obtained investigating the reaction from both sides. The method of Gaines and Thomas, revised by Soldatov, based on the dependence of the normalized Kielland selectivity quotients on the copper ionic fraction in the zeolite was used in order to obtain the thermodynamic equilibrium constant value. The significance of the thermodynamic equilibrium constant and the reversibility of the process were analyzed, as well as the influence of the non-ideality of the zeolite and solution phases.

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Abbreviations

a :

Coefficient in isotherm equations, thermodynamic activity in solution

\( \bar{a} \) :

Thermodynamic activity in zeolite

b :

Coefficient in isotherm equations

c :

Coefficient in isotherm equation (Keller)

f γ :

Debye–Hückel term, in the equation for the activity coefficient

m :

Molality

r :

R-squared coefficient

x :

Ionic fraction in solution

\( \bar{x} \) :

Ionic fraction in zeolite

z :

Number of elementary charges of an ion

B :

Second virial coefficient in the Debye equation for activity coeffiecients

C :

Third virial coefficient in the Debye equation for activity coeffiecients

F:

Test value for errors

K :

Thermodynamic equilibrium constant

\( \tilde{K} \) :

Corrected selectivity quotient

γ:

Activity coefficient in solution

γ’:

Activity coefficient in zeolite

ν:

Number of ions in an electrolyte

a :

Index for anion

c:

Index for cation

i :

Index for ion

M :

A certain cation

X :

A certain anion

±:

Mean ionic

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Authors and Affiliations

  1. Department of General Chemistry, University “Politehnica” of Bucharest, Str. Polizu 1, Bucharest, Romania

    St. Perişanu

  2. Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, University “Politehnica” of Bucharest, Str. Polizu 1, Bucharest, Romania

    Ana-Maria Oancea

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Perişanu, S., Oancea, AM. Na+/Cu2+ ion exchange equilibrium on Zeolite A: a thermodynamic study. Adsorption 21, 343–351 (2015). https://doi.org/10.1007/s10450-015-9674-8

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