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Interdiffusion in alkali ion sorption from mixed-solvent solutions on hydrous stannic oxide.III. K/H exchange and general discussion

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CONTRIBUTORS:
  Author Nasr Z. Misak (Atomic Energy Authority)
  Author Hussein F. Ghoneimy
  Author Etidal M. Mikhail
JOURNAL:
  Solid State ionics, 60(4), 305 - 311.
YEAR: 1993
PUB TYPE: Journal Article
SUBJECT(S): hydrous stannic oxide, ion exchange, kinetics, mixed solvents,hydrous oxides, interdiffusion coefficients
DISCIPLINE: Chemistry
HTTP:
LANGUAGE: English
PUB ID: 103-434-779 (Last edited on 2007/05/30 11:56:29 GMT-6)
SPONSOR(S):
 
ABSTRACT:
In the purely hydroxide solutions of Li, Na and K ions, the interdiffusion coefficient D decreases always in the order: propan-1-ol, ethanol, methanol.This may show that on going from one alcohol to another, the decrease of ion size is the dominant factor. The role of ion size in determining D seems to increase from Li to K. a considerable replacement of the more retarding OH coions in the oxide by Cl ions ( by adding Cl ion to the external alcoholic hydroxide solution) enhances alkali ion diffusivity. However, diffusivity may decrease at low Cl ion in solution due to limited replacement of OH ions by Cl ions and to retardation by both coions. This is more often with K ions forming more ion pairs with Cl ions in solution, which may result in a higher invasion of the oxide by Cl ions. In the hydroxide/chloride splutions, the order of D for Li is the same as in the purely hydroxide solutions. With Na ions, this order is mostly the reverse order (methanol higher than ethanol, and ethanol is higher than propan-1-ol), This is due to the probably large differences from one alcohol to another in the Na ion- Cl coion interactions in the solid. the effect of these interactions outweighs the effect of an increasing role, relative to Li ion, of ion size in determining D. With K ion, irregular orders are obtained, which are resultants of increasing contradictory roles of alkali ion-Cl ion interactions and ion size.
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