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Oxidation State of Iron in Glauconite from Oxidized and Reduced Zones of Soil-Geologic Columns
Glauconite Iron Mossbauer spectroscopy Oxidized zone Pyrite Reduced zone Soil
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2011/11/30
Abstract: Glauconite from the oxidized and reduced zones of soil-geologic columns at two Coastal Plain sites, one in Maryland and one in New Jersey, was examined by M鰏sbauer spectroscopy. The data ind...
Chromate Removal by Dithionite-Reduced Clays: Evidence from Direct X-Ray Adsorption Near Edge Spectroscopy (Xanes) of Chromate Reduction at Clay Surfaces
Illite IMt-2 Kaolinite KGa-2 Montmorillonite Reduction Smectite Sorption SWa-1 SWy-1 XANES
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2011/12/6
Abstract: Chromium(VI) in the environment is of particular concern because it is toxic to both plants and animals, even at low concentrations. As a redox-sensitive element, the fate and toxicity of ch...
Partial Stabilization of Fe(II) in Reduced Ferruginous Smectite by Li Fixation
Ferric Ferrous Ferruginous Smectite Infrared Spectroscopy Li Fixation Mossbauer Spectroscopy Oxidation Reduction SWa-1
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2011/12/7
Abstract: Partial stabilization of Fe(II) in chemically reduced smectite, which normally readily undergoes reoxidation in air, was achieved. The purpose of this study was to determine if Fe(II) can be...
Swelling and Texture of Iron-Bearing Smectites Reduced by Bacteria
Bacteria Biological Reduction Organo-Clay Interactions Smectites Structural Iron Swelling Pressure Texture
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2011/12/8
Abstract: Microbial reduction of clay mineral structural Fe(III) decreases the swelling of nontronite gels, most importantly at intermediate oxidation states (40 to 80 cmol Fe(II) kg−1 clay). Th...
The Quantity of Reduced Nickel in Synthetic Takovite: Effects of Preparation Conditions and Calcination Temperature
Calcination Nickel particle size Takovite Temperature programmed reduction
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2011/12/28
Takovite, Ni6Al2(OH)16CO3·5H2O, with molar Ni/Al ratios of 2.5 and 3 is prepared by precipitation at pH levels of 7 and 10, periods of reaction of 3 and 20 hr, and calcination temperatures varying bet...
Swelling Properties of Microbially Reduced Ferruginous Smectite
Dithionite Microorganism Pseudomonas
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2011/12/29
Structural Fe in ferruginous smectite (sample SWa-1, Source Clays Repository of the Clay Minerals Society) was reduced by a mixture of five Pseudomonas species of bacteria in a defined Fe-free medium ...
Preparation and Characterization of Reduced-Charge Hectorites
Alkylammonium exchange Cation exchange capacity Dehydroxylation Deprotonation Fluorescence Infrared spectroscopy Quinotine Surface acidity Thermogravimetry
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2011/12/31
A series of reduced-charge (RC) hectorites were prepared by multiple heat (250°C) treatments of Mg-saturated hectorites (SHCa-1). Cation exchange capacity (CEC) measurements and alkylammonium exchange...
Intervalence Electron Transfer and Magnetic Exchange in Reduced Nontronite
Intervalence electron transfer Iron Magnetic susceptibility Nontronite Reduction UV-visible spectroscopy
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2012/1/11
The effects of chemical reduction of structural Fe3+ in nontronite SWa-1 (ferruginous smectite) on intervalence electron transfer (IT) and magnetic exchange were investigated. Visible absorption spect...
Preparation and Handling of Dithionite-Reduced Smectite Suspensions
Dithionite Iron Nontronite Reduction Reoxidation Smectite
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2012/2/3
Using Garfield, Washington, nontronite as the model mineral system, methods and apparatus were developed to prepare reduced suspensions in citrate-bicarbonate-dithionite (CBD) solution. These techniqu...
Infrared Spectroscopic Study of Adsorbed Water on Reduced-Charge Na/Li-Montmorillonites
Cation-exchange capacity Infrared spectroscopy Montmorillonite Reduced charge Water adsorption
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2011/11/23
Abstract: Infrared (IR) spectra in the fundamental and near-IR regions were obtained for Na-saturated Wyoming montmorillonite and reduced-charge Na/Li-saturated. Wyoming montmorillonites hydrated unde...
Infrared and M鰏sbauer Studies of Reduced Nontronites
Dithionite Hydrazine Iron Nontronite Smectite
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2011/11/22
Abstract: Infrared and M鰏sbauer spectroscopy show that the extent of the reduction of nontronite is dependent on the chemical composition of the nontronite and on the nature of the reducing agent. Hyd...
Interpretation of Infrared Spectra of Oxidized and Reduced Nontronite
Oxidized Reduced Nontronite Interpretation structural hydroxyls
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2012/2/13
Infrared spectra of nontronite reveal shifts to lower wave, number in peaks located at 3570, 1030, and 821 cm−1, which are assigned to vibrational modes for O-H stretching, Si-Ob (basal oxygens)...
Properties of Reduced Charge Montmorillonites: Hydrated Cu(II) Ions as a Spectroscopic Probe
Montmorillonites Hydrated Cu(II) Ions Spectroscopic Probe
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2011/11/18
Abstract: A series of Cu(II) reduced charge montmorillonites (RCM) of varying charge reduction has been prepared by exchange of the parent Li(I)-Na(I) mineral with CuCl2 in 95 per cent ethanol solutio...
Properties of Reduced Charge Montmorillonite: Tetra-Alkylammonium Ion Exchange Forms
Montmorillonite Tetra-Alkylammonium Ion Exchange Forms
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2012/2/15
Surface properties of reduced charge montmorillonites (RCM) whose exchange capacities were saturated with tetra-alkylammonium cations, were studied with X-ray diffraction, nitrogen, and water adsorpti...