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Charge Density and Na-K-Ca Exchange on Smectites
Cation exchange Charge density Selectivity coefficient Smectite Swelling
2011/11/25
Abstract: Ca-K-, Na-K-, and Ca-Na-exchange isotherms on four reference smectites were studied. The electric charge on the four smectites was due predominantly to cationic substitution in the octahedra...
Effect of Adsorbed Iron on Thermoluminescence and Electron Spin Resonance Spectra of Ca-Fe-Exchanged Montmorillonite
Electron spin resonance Iron Montmorillonite Surface adsorption Thermoluminescence
2012/1/13
The electron spin resonance (ESR) spectra and the natural and gamma-induced thermoluminescence (TL) glow curves of a series of variably cation-exchanged Fe-Ca-clays prepared from SWy-1 montmorillonite...
Interlayer Structures of the Two-Layer Hydrates of Na- and Ca-Vermiculites
Crystal structure Fourier projection Hydrates Interlayer cation Vermiculite
2011/11/25
Abstract: The three-dimensional order shown by the two-layer hydrates of Na- and Ca-vermiculite, prepared from Mg-vermiculite from Llano, Texas, has enabled clear, two-dimensional Fourier projections ...
Co, Cu, Ni, and Ca Sorption by a Mixed Suspension of Smectite and Hydrous Manganese Dioxide
Adsorption Analytical transmission electron microscopy Birnessite Cation exchange Manganese oxide Montmorillonite Transition metals
2012/1/13
The sorption properties of Co, Cu, Ni, and Ca were studied in a mixed mineral suspension of synthetic MnO2 and Wyoming montmorillonite. The distribution of the sorbed cations between the two solid pha...
Thermodynamic Study of Na-K-Ca Exchange Reactions in Vermiculite
Cation exchange Entropy Free energy Interstratification Thermodynamics Vermiculite
2012/2/6
The exchange of Na, K, and Ca ions in vermiculite has been studied between 50 and 150°C at a total normality of 0.1. The free energy changes were negative in the Na → K, Ca → K, and Na → Ca exchange r...
Electrical Conductivity of Na/Ca-Montmorillonite Gels
Cation mobility Electrical conductivity Electrolyte Montmorillonite
2011/11/23
Abstract: The specific conductivity, κg, of Na°Ca montmorillonite gels (0.02 and 0.04 g clay/cm3) as a function of the specific conductivity of the interclay solution, κw, was measured. For low values...
Water Vapor Isotherms and Heat of Immersion of Na- and Ca-Montmorillonite Systems. III. Thermodynamics
Adsorption Heat of immersion Montmorillonite Thermodynamics Water
2012/2/9
The integral thermodynamic quantities of adsorbed water on Na- and Ca-montmorillonite have been calculated from water adsorption isotherms on Na- and Ca-montmorillonite at 298° and 313°K and from one ...
Swelling Components of Compacted Ca-Montmorillonite
Compaction Double layer theory Montmorillonite Pore-size distribution Swelling Water adsorption
2012/2/8
Intracrystalline water adsorption of Ca-montmorillonite was calculated as the product of one-half the interlayer spacing from X-ray powder diffraction analysis and the difference between the desorptio...
Ca-K Exchange Reaction and Interstratification in Montmorillonite
Enthalpy Entropy Free energy Interstratification Ion exchange Montmorillonite
2012/2/10
Cation-exchange equilibrium for Ca-K-montmorillonite was studied at 35亱, 50亱, and 90亱C and at three total normalities of the equilibrium solution (0.1, 0.05, and 0.01 N). Changes of the standard free ...
Water Vapor Isotherms and Heat of Immersion of Na/Ca-Montmorillonite Systems—II: Mixed Systems
Adsorption Calcium Electrostatic Hydration Isotherm Montmorillonite Sodium
2012/2/9
Adsorption isotherms for water vapor, c-spacing and heat of immersion in water of mixed Na/Ca-montmorillonite were measured at 25°C at various RH. There was good agreement between the calorimetric dat...
A Direct Procedure for Determining the Number of Plates in Tactoids of Smectites: The Na/Ca-Montmorillonite Case
Bentonite Conductivity Dispersion Hydraulic Smectite Tactoid
2012/2/10
The dispersion of clays is of great importance in determining various soil properties such as hydraulic conductivity. A procedure which involves fixing followed by embedding of clay particles in an ep...
Experimental Evaluation of Ca-K Exchange Selectivity Reactions in Estuarine Sediments
Experimental Evaluation Ca-K Exchange Selectivity Reactions Estuarine Sediments
2011/11/18
Abstract: Clay materials separated from estuarine sediments in Louisiana exhibit a selectivity for exchangeable calcium in laboratory experiments. The studies were conducted at 25°C and 60°C in mixed ...
The Determination of Adsorbed Na, K, Mg and Ca on Sediments Containing CaCO3 and MgCO3
Sediments Determination clay minerals smectite-CaCO3 mixtures
2012/2/13
A method for the determination of the cations of Na, K, Mg and Ca adsorbed on clay minerals mixed with CaCO3 and MgCO3 is described. An ethanolic solution of LiCl-CsCl is used to displace the exchange...
Adsorption of Ethylenediamine (EDA) on Montmorillonite Saturated with Different Cations IV: Al-, Ca- and Mg-Montmorillonite: Protonation, Ion-Exchange, Co-ordination and Hydrogen-Bonding
Adsorption Ethylenediamine Montmorillonite Hydrogen-Bonding
2012/2/14
Ethylenediamine (EDA) adsorbed from aqueous solution or vapor phase on Al-, Ca- and Mg-montmorillonite was retained to a more or less large extent in protonated form. The NH3+ :NH2 ratio decreased wit...
Water Vapor Isotherms and Heat of Immersion of Na/Ca-Montmorillonite Systems—I: Homoionic Clay
Water Vapor Isotherms Na/Ca-Montmorillonite Systems Homoionic Clay
2012/2/13
Adsorption isotherms for water vapor, c-spacing and heat of immersion in water of Na- and Ca-montmorillonite were measured at 25°C at various r.h. The amount of water adsorbed as a function of the r.h...