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Model for Competitive Adsorption of Organic Cations on Clays
Adsorption Clay-organic Methylene blue Montmorillonite Organic cation Thioflavin T
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...
Pentachlorophenol Sorption by Organo-Clays
Adsorption Hydrophobicity Organo-clay Pentachlorophenol Smectite Toxic wastes
2012/1/9
Several clay organic complexes were prepared by placing organic cations on the exchange sites of smectite clays and studied as sorbents for pentachlorophenol (PCP). The organic cations used ranged fro...
Fourier-Transform Infrared Study of Ethylene Glycol Monoethyl Ether Adsorbed on Montmorillonite: Implications for Surface Area Measurements of Clays
Adsorption Attenuated total reflectance spectroscopy Ethylene glycol monoethyl ether Infrared spectroscopy Molecular configuration Montmorillonite
2011/11/25
Abstract: Infrared spectra of 2-ethoxyethanol (ethylene glycol monoethyl ether, EGME) adsorbed on Camontmorillonite were obtained using diffuse-reflectance infrared-Fourier-transform (DRIFT) and atten...
Multiple Cation-Exchange Capacity Measurements on Standard Clays Using a Commercial Mechanical Extractor
Apparatus Cation-exchange capacity Ion-exchange method K-fixation Leaching tube 2:1 clay minerals
2011/11/25
Abstract: Sequential cation-exchange capacity (CEC) measurements were obtained from standard clays using a mechanized, variable-rate leaching device. The device consists of a motorized screwjack and a...
Hydrothermal Synthesis and Characterization of Cobalt Clays
Chrysotile Cobalt Mica Smectite Synthesis Talc Tetraatkylammonium ion Vermiculite
2011/11/25
Abstract: Reaction of mixtures of cobalt nitrate, colloidal silica, and a metal hydroxide (MOH) under hydrothermal conditions produced a range of cobalt hydroxysilicates, the components of which depen...
Composition of some Smectites and Diagenetic Illitic Clays and Implications for their Origin
Bentonite Chemical composition Illite Interstratified Layer charge Potassium Smectite X-ray fluorescence
2012/1/12
Chemical analysis by X-ray fluorescence (XRF) and calculated structural formulae of clay-size fractions of smectites from Cretaceous bentonites and illitic clays from Cretaceous, Devonian, and Ordovic...
Mossbauer Spectroscopic Study of the Iron Mineralogy of Post-Glacial Marine Clays
Hematite Iron Magnetite Mossbauer spectroscopy Quick clay Smectite Yield strength
2012/1/12
Three post-glacial marine clays from eastern Canada and one marine clay from Japan have been studied by M鰏sbauer spectroscopy to ascertain their iron mineralogy. Small amounts of hematite (in two samp...
High-Resolution Imaging of Ordered Mixed-Layer Clays
Chlorite Corrensite High-resolution transmission electron microscopy Illite Lattice imaging Mixed layer Particle size Rectorite Smectite
2012/1/11
High-resolution transmission electron microscopy (HRTEM) has been used to examine illite/smectite from the Mancos Shale; rectorite from Garland County, Arkansas; illite from Silver Hill, Montana; Na-s...
Palygorskite Separation from Dodecylammonium-Treated Clays
Dodecylammonium smectite Hydrophobic properties Mineral separation Palygorskite Sepiolite Smectite
2012/2/2
Three methods were investigated to separate palygorskite from mixtures of clay minerals in soils and sediments. The methods were based on the hydrophobic properties of a dodecylammonium-smectite compl...
Measurement of the Specific Surface Area of Clays by Internal Reflectance Spectroscopy
Ethylene glycol monoethyl ether Infrared spectroscopy Internal reflectance spectroscopy Molar absorptivity Montmorillonite Surface area
2012/2/2
The specific surface area, S, of a clay is commonly measured by the adsorption of ethylene glycol monoethyl ether (EGME); however, this method can be tedious and time consuming, especially if the clay...
Review of the Diffusion of Water and Pyridine in the Interlayer Space of Montmorillonite: Relevance to Kinetics of Catalytic Reactions in Clays
Catalysis Diffusion Interlayer space Kinetics Montmorillonite Pyridine Water
2012/2/1
With the current interest in the use of transition metal-exchanged phyllosilicates as catalysts for novel organic syntheses, investigations into the factors which affect the movement of reactant, prod...
Effect of the Dielectric Constant on the Double Layer on Clays
Dielectric constant Double layer potential Gouy model Montmorillonite Water
2012/2/2
Electric potentials as a function of distance were calculated for a model of the double layer on clays in which a surface zone a few water molecules thick has a low dielectric constant. This zone is f...
Interactions of Polycations of Aluminum and Iron with Clays
Aluminum Electrophoresis Intercalation Iron Kaolinite Montmorillonite Polycations Surface charge
2011/11/25
Abstract: Polycations of limited molecular size were prepared from 0.1 M solutions of Fe(III)(NO3)3 and Al(NO3)3 by ultrafiltration. Various amounts of the polycations were added to Na-kaolinite, Na-m...
Colloid Stability of Clays Using Photon Correlation Spectroscopy
Coagulation rate Hamaker constant Illite Kaolinite Light scattering Montmorillonite Palygorskite Photon correlation spectroscopy Stern potential
2012/2/6
Photon correlation spectroscopy (PCS), a dynamic light-scattering technique for particle size measurement, was used to determine the coagulation rates of aqueous dispersions of relatively mono-dispers...
Comparison of Rapid Methods for Chemical Analysis of Milligram Samples of Ultrafine Clays
Borate fusion Chemical analysis Classic rock analysis HF decomposition Microanalytical method
2012/2/7
Two rapid methods for the decomposition and chemical analysis of clays were adapted for use with 20–40-mg size samples, typical amounts of ultrafine products (≤0.5-µm diameter) obtained by moder...