Divalent ion exchange of alkaline-earth cations into the triple-layered perovskite RbCa2Nb3O10

1998 ◽  
Vol 33 (11) ◽  
pp. 1581-1586 ◽  
Author(s):  
Charles H Mahler ◽  
Brian L Cushing ◽  
John N Lalena ◽  
John B Wiley
Keyword(s):  
Ion Exchange ◽  
Alkaline Earth ◽  
Layered Perovskite ◽  
Alkaline Earth Cations

Topotactic route to synthesis of novel hydroxylated phases: I. Trioctahedral Micas

Clay Minerals ◽  
1986 ◽  
Vol 21 (2) ◽  
pp. 125-131 ◽  
Author(s):  
S. Komarneni ◽  
R. Roy
Keyword(s):  
Ion Exchange ◽  
Alkaline Earth ◽  
Water Molecules ◽  
Hydration Energy ◽  
Hydrothermal Conditions ◽  
Potential Applications ◽  
Clay Layers ◽  
First Time ◽  
Hydrolysis Of ◽  
Alkaline Earth Cations

AbstractK-depleted phlogopite mica was used as a topotactic precursor and treated with alkali (Li+, K+, , Rb+, Cs+), alkaline-earth (Mg2+, Ca2+, Sr2+, Ba2+) and trivalent (Al3+) cations under hydrothermal conditions of 200°C and 30 MPa pressure. K-, NH4-, Rb- and Cs-aluminosilicate micas were synthesised at 200°C in one day. The synthesis of Cs-aluminosilicate mica, with potential applications in the management of nuclear wastes, has been achieved for the first time by this approach. Ion exchange by Li+, Na+ and alkaline-earth cations under hydrothermal conditions did not produce anhydrous mica phases but resulted in hydrous phases with one or two layers of water molecules between the clay layers. The formation of hydrous phases may be attributed to the high hydration energy of the above cations compared to K+, , RB+ and Cs+. Ion exchange with Al3+ produced a chlorite-like phase because of the hydrolysis of Al3+ under these hydrothermal conditions. These studies are of relevance in the immobilization of wastes where hazardous ions can be fixed in highly stable insoluble phases like mica or chlorite.

scholarly journals Modified Zeolites in Gas Chromatography for the Analysis of Air Pollutants

1996 ◽  
Vol 14 (4) ◽  
pp. 209-216
Author(s):  
O.S. Banakh ◽  
R.I. Baranskyi ◽  
V.J. Rogovyk ◽  
I.M. Zybak
Keyword(s):  
Gas Chromatography ◽  
Ion Exchange ◽  
Air Pollutants ◽  
Alkaline Earth ◽  
Chromatographic Columns ◽  
Retention Volumes ◽  
Modified Zeolites ◽  
Alkaline Earth Cations

Based on zeolites of types X, Y and M, with and without binding clay, ion-exchange modifications containing alkali and alkaline earth cations (silver and copper) and different quantities of water have been prepared. Data obtained with these zeolites have enabled their retention volumes and selectivities towards low boiling hydrocarbons and oxide gases to be calculated. Sharp changes were observed in these parameters when the chromatography of ethane and other gases was conducted on such zeolites with up to 10% K+, Rb+ and Cs+ cations replaced, i.e. when low replacement of exchangable cations had been effected. The same effect was encountered with CO and olefins when 0.08CuNaY zeolite was employed. An increase in temperature and the introduction of water into the system caused a decrease in the effect. These observations have prove useful in the construction of chromatographic columns and adsorption filters for the extraction and concentration of certain pollutants.

UPTAKE OF METAL IONS BY A NEW CHELATING ION-EXCHANGE RESIN. VII. ALKALINE EARTH CATIONS∗∗

1995 ◽  
Vol 13 (6) ◽  
pp. 1063-1082 ◽  
Author(s):  
R. Chiarizia ◽  
J. R. Ferraro ◽  
E. P. Horwitz ◽  
K. A. D'Arcy
Keyword(s):  
Ion Exchange ◽  
Metal Ions ◽  
Alkaline Earth ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Alkaline Earth Cations
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