scholarly journals Structural and Ion-Exchange Properties of Natural Zeolite

10.5772/51682 ◽  
2012 ◽  
Author(s):  
Aiymgul M.
Keyword(s):  
Ion Exchange ◽  
Natural Zeolite ◽  
Exchange Properties

scholarly journals Ion-exchange properties of the natural zeolite amicite

2020 ◽  
Vol 39 (2) ◽  
pp. 207
Author(s):  
Nikita V. Chukanov ◽  
Olga N. Kazheva ◽  
Nadezhda A. Chervonnaya ◽  
Dmitry A. Varlamov ◽  
Vera N. Ermolaeva ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Infrared Spectra ◽  
Natural Zeolite ◽  
Unit Cell Volume ◽  
Cell Parameter ◽  
Direct Methods ◽  
Unit Cell ◽  
Unit Cell Parameters ◽  
Cell Parameters ◽  
Exchange Properties

Crystals of the natural zeolite amicite, ideally K4Na4(Al8Si8O32)·10H2O, were ion-exchanged in the reactions with 0.1 N aqueous solutions of AgNO3, RbNO3, CsNO3 and Pb(NO3)2 at 363 K for 24 h. Under these conditions, Cs+ substitutes K+ whereas the most part of Na+ remains unexchanged; Rb+ partly substitutes both Na+ and K+; Pb2+ and Ag+ completely substitute Na+ and K+. All the compounds are monoclinic. The Cs- and Rb-substituted samples have unit-cell parameters close to those of initial amicite. The exchange of Na+ and K+ for Ag+ is accompanied by a significant decrease of the unit-cell volume. The unit-cell parameter c of Pb-amicite is nearly threefold larger than the c parameter of initial amicite. Infrared spectra show that framework topology is preserved during the ion exchange. The crystal structures of initial and Cs-exchanged amicites have been solved by direct methods.

scholarly journals THE ION-EXCHANGE PROPERTIES OF NATURAL ZEOLITE MORDENITE

2016 ◽  
Vol 11 (1) ◽  
pp. 29-33 ◽  
Author(s):  
G. A. Mamedova
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Natural Zeolite ◽  
High Speed ◽  
Hydration Shell ◽  
Ionic Exchange ◽  
Sodium Potassium ◽  
Exchange Value ◽  
Sodium Cations ◽  
Exchange Properties

The cation exchange properties of mordenite (a Nakhchivan natural zeolite) were studied. Ion exchange of the original cations - sodium, potassium and calcium - by magnesium, strontium, cadmium, zinc and nickel cations was carried out. It was found that in the case of Zn cations cation exchange occurs readily at a high speed and the maximum value of the degree of exchange. A low value of the degree of cation exchange is observed for Mg. This is due to the large hydration shell of magnesium, which adversely affects the cation exchange. High values of the exchange rate of Na+ cations have already been explained at the first exchange of low content of sodium cations and their location mostly in exchange for positions available. The lesser ability to exchange K+, Na+ cations than contained in the natural zeolite is due to several reasons. With an increasing number of degrees of ionic exchange value exchangeable cations K+ vary to a greater degree than the degree of exchange of the cations Na+. Firstly, the content and size of the K+ cation are greater than those of the Na+ cations. Furthermore, a part of the K+ cations is in exchange for hard cancrinites cells. It has been found that the degree of cation exchange of K+ (αK), contained in the original zeolite, with Mg2+, Ni2+, Sr2+, Zn2+, Cd2+ cations is considerably lower than the values of the degree of cation exchange of Na+ (αNa) at the same cations.

ION Exchange Characterisation of Modified Zeolite

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2269-2272 ◽  
Author(s):  
Š Cerjan-Stefanovic ◽  
M. Kaštelan-Macan ◽  
T. Filipan
Keyword(s):  
Drinking Water ◽  
Ion Exchange ◽  
Anion Exchange ◽  
Natural Zeolite ◽  
Deionized Water ◽  
Isomorphous Substitution ◽  
Waste Waters ◽  
Modified Zeolite ◽  
Water Drinking

Isomorphous substitution of phosphorus into a natural zeolite affords the possibility to change the overall framework charge from negative to positive. The substances so created should be used for purification of waste waters. The work describes the preparation of phosphated zeolite, their characterisation and examples of their anion exchange of NO3 on observed in deionized water, drinking water and in the solution containing varying amounts of nitrate.

Homologous Series of 2D Chalcogenides Cs–Ag–Bi–Q (Q = S, Se) with Ion-Exchange Properties

2017 ◽  
Vol 139 (36) ◽  
pp. 12601-12609 ◽  
Author(s):  
Jing Zhao ◽  
Saiful M. Islam ◽  
Shiqiang Hao ◽  
Gangjian Tan ◽  
Constantinos C. Stoumpos ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Homologous Series ◽  
Exchange Properties
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