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FTIR Reflectance vs. EPR Studies of Structural Iron in Kaolinites
EPR Fe Kaolinite Mid and near infrared Substitution
2011/12/29
The substitution of Fe3+ in the kaolinite structure is studied by EPR spectrometry and by FTIR spectrometry on a large set of kaolins from different origins (sedimentary and primary ores, soil kaolins...
Reduction of Structural Iron in Ferruginous Smectite by Free Radicals
Clay Dithionite Electron spin resonance spectroscopy ESR Hydrazine Iron Reduction Smectite Sulfide Thiosulfate
2011/12/31
The oxidation state of structural iron greatly influences the physical-chemical properties of clay minerals, a phenomenon that may have significant implications for pollutant fate in the environment, ...
Effects of Structural Iron Reduction on the Hydraulic Conductivity of Na-Smectite
Barriers Bulk density Clay Hydraulic conductivity Iron Liners Permeability Reduction Smectite Water
2011/12/31
The long-term impermeability of clay barriers in waste disposal facilities and hydraulic structures is of critical importance to environmental, agricultural, and industrial concerns. Changes in the ox...
Effects of Reduction and Reoxidation of Structural Iron on the Surface Charge and Dissolution of Dioctahedral Smectites
Dissolution Iron Nontronite Oxidation Reduction Smectite Surface area
2012/2/6
The effect of Fe oxidation state on the surface charge (CEC) and solubility of smectites were studied using the <2-祄, Na+-saturated fraction of an Upton, Wyoming; a Czechoslovakian; and a New Zealand ...
Mossbauer Effect Studies of Iron in Kaolin. I. Structural Iron
Iron Kaolinite Mossbauer effect Paramagnetism Structural substitution
2012/2/7
57Fe M鰏sbauer spectra of a cleaned Weipa, Australia, kaolin showed that a considerable fraction of the structural iron exhibits paramagnetic relaxation between 4癒 and 300癒 the first time that this has...
Oxidation and Reduction of Structural Iron in Chlorite at 480癈
Chlorite Infrared spectroscopy Iron Mossbauer spectroscopy Oxidation Reduction
2012/2/7
An iron-rich chlorite, ripidolite, was oxidized by air-heating at 480?i.e., below the dehydroxylation temperature and subsequently reduced in hydrogen at the same temperature. On the basis of chemical...
Catalytic Action of Copper on the Oxidation of Structural Iron in Vermiculitized Biotite
Biotite Catalyst Copper Iron Oxidation Vermiculite
2012/2/7
The ferrous iron content of two vermiculitized biotites decreased by treatment with 0.1 N salts of copper at 70°C from 9.1–14% to 1.8–2.6%. Presumably, interlayer copper ions acted as a catalyst (here...
Reactivity of Adsorbed and Structural Iron in Hectorite as Indicated by Oxidation of Benzidine
Adsorbed Iron Benzidine Catalysis Electron Transfer Hectorite Oxidation
2012/2/9
The roles of different forms of Fe(III) impurities in a hectorite with respect to the oxidation of benzidine in aqueous suspension have been evaluated using electron spin resonance and UV-visible spec...