Removal of Heavy Metal Ions from Solutions by Means of Zeolites. I. Thermodynamics of The Exchange Processes between Cadmium Ions from Solution and Sodium Ions from Zeolite A (CROSBI ID 77610)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Biškup, Biserka ; Subotić, Boris
engleski
Removal of Heavy Metal Ions from Solutions by Means of Zeolites. I. Thermodynamics of The Exchange Processes between Cadmium Ions from Solution and Sodium Ions from Zeolite A
Relationships between corrected selectivity coefficient, KC, and fraction of the exchanged cadmium ions in zeolite A, fCd, Z, were determined from the data obtained by measuring the concentrations of sodium and cadmium ions in both the solid and the liquid phase at equilibrium of the exchange processes between cadmium ions from solution and sodium ions from zeolite A at different total ion concentrations and different temperatures. Thermodynamic equilibrium constants, Ka , calculated from the corresponding Kielland� s plots (KC vs. fCd, Z plots) were used for the calculation of the appropriate values of standard free energy, DGo , standard enthalpy, DHo and standard entropy, DSo. Influence of the degree of exchange on the activity coefficients of sodium and cadmium ions in zeolite is also considered.
cadmium ions; exchange equilibrium; ion exchange; sodium ions; thermodynamic data; zeolite A
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Podaci o izdanju
33 (4)
1998.
449-466-x
objavljeno
0149-6395
10.1080/01496399808544990