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Model for Competitive Adsorption of Organic Cations on Clays
Adsorption Clay-organic Methylene blue Montmorillonite Organic cation Thioflavin T
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2012/1/9
The adsorption on montmorillonite of two monovalent organic cations, methylene blue (MB) and thioflavin T (TFT), was studied in four different situations: (1) separate adsorption of MB or TFT; (2) com...
Preparation of Delaminated Clay Having a Narrow Micropore Distribution in the Presence of Hydroxyaluminum Cations and Polyvinyl Alcohol
Delaminated clay Hydroxy aluminum Montmorillonite Ordering Pillaring Polyvinyl alcohol Pore size Surface area
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2012/1/9
The pillaring of Na-montmorillonite with cationic oligomers of hydroxyaluminum (COHA) in the presence of an aqueous solution of polyvinyl alcohol resulted in the formation of a clay having a large sur...
X-ray Photoelectron Spectroscopic Study of the Effect of Heating on Montmorillonite Containing Sodium and Potassium Cations
Montmorillonite Noncrystalline Surface composition Thermal treatment X-ray photo-electron spectroscopy X-ray powder diffraction
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2012/1/13
The effect of heating on montmorillonites containing exchangeable Na and K has been studied by X-ray photoelectron spectroscopy (XPS). The surface composition of the unheated montmorillonite was consi...
Iron Sites in Nontronite and the Effect of Interlayer Cations From Mossbauer Spectra
Interlayer cation Iron Mossbauer spectroscopy Nontronite Octahedral site
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2011/11/25
Abstract: The 57Fe Mössbauer spectra of untreated, Ca- and K-saturated nontronite from Garfield, Washington, were measured. The spectrum of the untreated sample was computer-fitted to 8 peaks def...
Clays, Cations, and Geophysical Log Response of Gas-Producing and Nonproducing Zones in the Gammon Shale (Cretaceous), Southwestern North Dakota
Exchange cations Geophysical log Mixed layer Natural gas Shale Statistical analysis
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2012/2/6
The Upper Cretaceous Gammon Shale has served as both source bed and reservoir rock for accumulations of natural gas. Gas-producing and nonproducing zones in the Gammon Shale are differentiated on the ...
Interlayer Cations as Reaction Directors in the Transformation of Limonene on Montmorillonite
Catalysis Cation Disproportionation Isomerization Limonene Montmorillonite
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2012/2/6
Clays may catalyze chemical reactions by acting as Br鰊sted acids, Lewis acids, and/or Lewis bases. The changes occurring when limonene (p-menthadiene) is heated in the presence of montmorillonite illu...
Interactions of Some Large Organic Cations with Bentonite in Dilute Aqueous Systems
Adsorption Bentonite Herbicide Organocations Smectite
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2012/2/8
Adsorption studies indicate that paraquat, diquat, and thionine are bound on bentonite by amounts greater than the measured cation-exchange capacity (CEC) of the clay. Methylene blue, new methylene bl...
Exchange and Selective Surface Uptake of Cations by Layered Silicates Using X-ray Photoelectron Spectroscopy (XPS)
Beidellite Cation Exchange Surface Exchange X-ray Photoelectron Spectroscopy
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2012/2/10
The cation-exchange capacities (CEC) of a previously well-characterized beidellite have been estimated nondestructively from X-ray photoelectron spectroscopy (XPS) data following exchange by various c...
Adsorption Of Ethylenediamine (EDA) On Montmorillonite Saturated with Different Cations—V. Ammonium- and Triethylammonium-Montmorillonite: Ion-Exchange, Protonation and Hydrogen-Bonding
Triethylammonium-Montmorillonite Adsorption Ethylenediamine
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2012/2/15
On NH4- as well as on (C2H5)3NH-montmorillonite EDA was adsorbed in protonated form. The extent of protonation depended on the relative basicities and concentrations of the interacting compounds. In t...
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
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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...
Adsorption of Ethylenediamine (EDA) on Montmorillonite Saturated with Different Cations—III. Na-, K- and Li-Montmorillonite: Ion-Exchange, Protonation, Co-Ordination and Hydrogen-Bonding
Adsorption of Ethylenediamine Montmorillonite Co-Ordination Hydrogen-Bonding
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2011/11/18
Abstract: Ethylenediamine (EDA) is adsorbed from aqueous solution on Na-, K- and Li-montmorillonite as the monoprotonated cation (EDAH+) through an ion-exchange process. On washing with distilled wate...
Dielectric Properties of Montmorillonites Saturated by Bivalent Cations
Montmorillonites Bivalent Cations Dielectric Properties
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2012/2/14
This study deals with the analysis of dielectric measurements made on montmorillonites saturated by bivalent cations. These measurements are performed between −150°C and + 30°C at frequencies ra...
Distribution of Major Cations in Estuarine Sediments
Distribution Major Cations Estuarine Sediments
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2012/2/15
This paper reports the measured distribution of major cations in interstitial, exchangeable and non-exchangeable phases of estuarine sediments. The observed changes in ionic ratios result from the val...
Adsorption of Ethylenediamine (EDA) on Montmorillonite Saturated with Different Cations—II. Hydrogen- and Ethylenediammonium-Montmorillonite: Protonation and Hydrogen Bonding
Ethylenediammonium-Montmorillonite Montmorillonite Protonation Hydrogen Bonding
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2012/2/17
The form under which ethylenediamine (EDA) is adsorbed from aqueous solution by hydrogen- and ethylenediammonium-montmorillonite was studied as a function of the amount of amine present in the system....
Selective Sorption and Fixation of Cations by Clay Minerals: A Review
Selective Sorption Fixation of Cations Clay Minerals Review
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2012/2/15
Investigations concerning selective sorption and fixation of K and similar cations by clay minerals and soil clays and the mechanisms of these reactions are reviewed. In particular, recent observation...