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Hard and Soft Acid-Base Model Applied to Bivalent Cation Selectivity on a 2:1 Clay Mineral
Bivalent Cations Covalent Bonding Electronegativity HSAB Montmorillonite Selectivity Coefficient Softness
2011/12/8
Abstract: We applied the hard and soft acid-base (HSAB) model (Xu and Harsh 1990a, 1990b) to bivalent cation exchange on a purified Ca-montmorillonite. As a result, a satisfactory model is proposed to...
Alkali Cation Selectivity and Surface Charge of 2:1 Clay Minerals
Hard/soft acid/base model Ion exchange Isomorphic substitution Layer charge Lewis acid Lewis base Smectite Surface complexation Vermiculite
2011/12/31
A critical demand in environmental modeling and a desirable but elusive goal of research on the ion exchange properties of the charged solid surface has been to determine the selectivity coefficient f...
ALKALI CATION SELECTIVITY AND SURFACE CHARGE OF 2:1 CLAY MINERALS
Hard/soft acid/base model Ion exchange Isomorphic substitution Layer charge Lewis acid
2011/11/15
A critical demand in environmental modeling and a desirable but elusive goal of research on the ion exchange properties of the charged solid surface has been to determine the selectivity coefficient f...
Alkali Cation Selectivity and Fixation by Clay Minerals
Cation exchange Cation fixation Cation selectivity Equivalent anionic radius Free energy of exchange Illite Smectite
2012/2/9
Two variables must be considered when calculating exchange free energies (ΔG0ex) for 2:1 clays: (1) anionic field strength, as expressed by equivalent anionic radius (ra), and (2) interlayer water con...
An Interpretation of Cation Selectivity Variations in M+—M+ Exchange on Clays
Adsorption Cation exchange Montmorillonite Selectivity Statistical mechanics
2012/2/10
The decreasing preference of montmorillonite for K+ relative to Na+ as the clay adsorbs increasing amounts of K+ is shown to be the general rule for the exchange of strongly hydrating ions by weakly h...