Ion-exchange selectivity and metal ion separations with a perfluorinated cation-exchange polymer

1979 ◽  
Vol 51 (7) ◽  
pp. 862-865 ◽  
Author(s):  
H. L. Yeager ◽  
A. Steck
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Metal Ion ◽  
Metal Ion Separations ◽  
Exchange Selectivity

Alkali metal ion exchange selectivity of Al-substituted tobermorite

1989 ◽  
Vol 4 (3) ◽  
pp. 698-703 ◽  
Author(s):  
Masamichi Tsuji ◽  
Sridhar Komarneni
Keyword(s):  
Ion Exchange ◽  
Alkali Metal ◽  
Cation Exchange ◽  
Separation Factor ◽  
Metal Ion ◽  
Infinite Dilution ◽  
Exchange Reactions ◽  
Alkali Metal Ion ◽  
Metal Ion Exchange ◽  
Exchange Selectivity

Alkali metal ion exchange isotherms at a total ionic strength of 0.001 M were determined at 25 °C on a 1.13 nm anomalous [Al3+ + Na+]-substituted tobermorite with the formula, Ca5Na0.75Al0.9Si5.1O16(OH)2 · 6.03H2O. The Kielland plots of Na+/K+, Na+/Rb+, and Na+/Cs+ exchange reactions showed straight lines. The slopes were steeper for Cs+ and Rb+ exchange reactions, as compared to K+ exchange. The cation-exchange selectivity for alkali metals was found to increase as follows: Cs+>Rb+>K+>Na+. A new evaluation method of the separation factor (αMN/KMd/KNd,Kd: distribution coefficient) for a combination of two cations at infinite dilution was proposed in terms of the selectivity coefficient (KMNa) which can be easily determined from the Kielland plot. An extremely large separation factor for Cs (αCsNa = 112) was found at infinite dilution. These basic studies of cation exchange selectivity are of relevance in cation separation and purification and nuclear waste disposal.

Hofmeister Effects on Cation Exchange Equilibrium: Quantification of Ion Exchange Selectivity

2013 ◽  
Vol 117 (12) ◽  
pp. 6245-6251 ◽  
Author(s):  
Xinmin Liu ◽  
Hang Li ◽  
Wei Du ◽  
Rui Tian ◽  
Rui Li ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Exchange Equilibrium ◽  
Exchange Selectivity

Alginate Polyelectrolyte Ionotropic Gels-XII. Chromatographic Separation of Divalent Transition Metal Ions using Alginates as Ion Exchangers

1992 ◽  
Vol 4 (1) ◽  
pp. 49-54 ◽  
Author(s):  
Refat M. Hassan ◽  
S. A. El-Shatoury ◽  
M. Th. Makhlouf
Keyword(s):  
Ion Exchange ◽  
Metal Ions ◽  
Metal Ion ◽  
Transition Metal Ions ◽  
Selectivity Coefficient ◽  
Divalent Metal ◽  
Divalent Metal Ions ◽  
Ion Exchangers ◽  
Calcium Alginate Gel ◽  
Exchange Selectivity

The separation of divalent metal ion mixtures has been investigated chromatographically on columns of either gel or sol forms of alginate polyelectrolyte. Separation was obtained in the form of narrow sharp zones for the metal ions. Ion exchange selectivity indicated that Cu2+ ions were most strongly retained among the divalent metal ions studied. The factors which affect the ion exchange selectivity, such as the strength of chelation and the mobility and radii of the metal ions, are discussed. The selectivity coefficient for the separation of a mixture of Cu2+ and Co2+ ions on columns of calcium alginate gel or sodium alginate sol was determined and found to be 1.9 ± 0.1 in both ion exchangers at 25°C.

scholarly journals Cation-Exchange Properties of Aluminium(III) Phosphate

1996 ◽  
Vol 13 (4) ◽  
pp. 261-279 ◽  
Author(s):  
S. Mustafa ◽  
A. Naeem ◽  
N. Rehana ◽  
H.Y. Samad
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Thermodynamic Parameters ◽  
Metal Ion ◽  
Aqueous Electrolyte ◽  
Electrolyte Solutions ◽  
Ion Sorption ◽  
Metal Ion Uptake ◽  
Titration Data ◽  
Exchange Properties

Potentiometric titrations of aluminium(III) phosphate have been performed in the presence of aqueous electrolyte solutions containing Cu2+, Zn2+, Ni2+ and K+ ions as a function of the concentration of the latter, the pH and the temperature. The sorption of Zn2+ ions has also been studied and the data for metal ion sorption shown to correlate with the Potentiometric titration data, indicating that the process responsible for metal ion uptake is ion exchange. The pKa value of the exchanger and its thermodynamic parameters have been evaluated.

Study on Treatment of Heavy Metal Lons of Chemical Wastewater by Ion Exchange Resin

2014 ◽  
Vol 955-959 ◽  
pp. 2230-2233 ◽  
Author(s):  
Yong Gang Zeng ◽  
Long Li
Keyword(s):  
Heavy Metal ◽  
Ion Exchange ◽  
Cation Exchange ◽  
Flow Velocity ◽  
Metal Ion ◽  
Exchange Resin ◽  
Removal Rate ◽  
Cation Exchange Resin ◽  
Ion Exchange Resin ◽  
Resin Method

This paper used the ion exchange resin method to treat the heavy metal ion Cu2+ of a chemical wastewater and studied the flow velocity, pH and the temperature’s effect on Cu2+ removal effect by macroporous strongly acidic styrene type cation exchange resin D001. The results shown that: when the flow velocity was 1.5 mL/min, pH was 6.0 and the temperature was 30°C, the removal rate of Cu2+ by D001 reached 99.8%. The chemical wastewater could achieve the wastewater’s discharge standard.

Metal ion separations using electrically switched ion exchange

1997 ◽  
Vol 11 (3) ◽  
pp. 147-158 ◽  
Author(s):  
M.A. Lilga ◽  
R.J. Orth ◽  
J.P.H. Sukamto ◽  
S.M. Haight ◽  
D.T. Schwartz
Keyword(s):  
Ion Exchange ◽  
Metal Ion ◽  
Metal Ion Separations

Am3+ and Eu3+ /alkali cation exchange selectivity on mordenite and zeolite L

2000 ◽  
Vol 15 (12) ◽  
pp. 2849-2856 ◽  
Author(s):  
Masamichi Tsuji ◽  
Hitoshi Mimura
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Selectivity Coefficient ◽  
Alkali Cation ◽  
Ionic Form ◽  
Alkali Cations ◽  
Ionic Radii ◽  
Zeolite L ◽  
Exchange Site ◽  
Exchange Selectivity

Am3+ and Eu3+ /alkali cation exchange selectivity was studied on mordenite and zeolite L at 25 to 60 °C to examine the effect of their openings of ion-exchange sites. The corrected selectivity coefficient at the infinitesimal exchange increased in the order of Eu3+ < Am3+ on mordenite and Am3+ < Eu3+ on zeolite L. The selectivity reversal did not reflect the effect of the ionic form, but reflected the dimension of the opening of the ion-exchange site and charge of trivalent cations, since the crystal ionic radii of alkali cations were much smaller than the openings of these zeolites (7–8 Å).

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