Ion-Exchange Equilibria between Some Rare Earth Metal Ions and Hydrogen Ions in Iron(III) and Tin(IV) Antimonates as Cation Exchangers

Ion-exchange equlibria of trivalent rare earth metal ions (Eu3+, Gd3+, and Tm3+)/H+systems were studied at 25, 35, and 50 ± 1°C on FeSb and SnSb as cation exchangers. The exchange isotherms were measured for both forward and reverse reactions with a solution of ionic strength 0.1 by the batch techni...

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Bibliographic Details
Published inMicrochemical journal Vol. 60; no. 2; pp. 95 - 100
Main Authors El-Shahat, M.F., Saad, E.A., Burham, N., El-Naggar, I.M.
Format Journal Article
LanguageEnglish
Published New York, NY Elsevier B.V 01.10.1998
Elsevier
Subjects
Chemistry
Exact sciences and technology
General and physical chemistry
Solution properties
Solutions
Equilibrium constant
Transition metal Compounds
Tin Antimonates
Temperature effect
Experimental study
Chemical equilibrium
Metal Compounds
Cation exchange capacity
Medium effect
Ionic strength
Thermodynamic parameter
Iron Antimonates
Aqueous solution
Lanthanide Ions
Physicochemical properties
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Summary:Ion-exchange equlibria of trivalent rare earth metal ions (Eu3+, Gd3+, and Tm3+)/H+systems were studied at 25, 35, and 50 ± 1°C on FeSb and SnSb as cation exchangers. The exchange isotherms were measured for both forward and reverse reactions with a solution of ionic strength 0.1 by the batch technique. Selectivity coefficients (log scale) varied with the equivalent fraction (X̄M) of rare earth metal ions in the exchanger and gave a linear function againstX̄Min the range 0.5 to 1. The selectivity sequence on zero loading is Tm3+< Gd3+< Eu3+for both exchangers. The overall thermodynamic data are evaluated.
ISSN:0026-265X
1095-9149
DOI:10.1006/mchj.1998.1647