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Influence of Citric and Tannic Acids on Hydroxy-Al Interlayering in Montmorillonite
Al polymers Hydroxy-Al interlayer Ion-exchange resin Montmorillonite Organic acid Specific surface
2011/11/25
Abstract: The formation of hydroxy-Al-interlayered montmorillonite was affected by complexing organic acids. Montmorillonite (<2.0 祄) was aged for three months at an initial pH of 5.0 or 6.0 in AlCl3 ...
Influence of Al Substitution and Crystal Size on the Room-Temperature Mossbauer Spectrum of Hematite
Aluminum Hematite Iron Mossbauer spectroscopy Particle size
2011/11/25
Abstract: Mossbauer spectra of 15 hematites with Al substitutions between 0 and 10 mole % were taken at room temperature. X-ray powder diffraction indicated dimensions of these hematites in the c-dire...
Influence of Glycine on Cu2+ Adsorption by Microcrystalline Gibbsite and Boehmite
Adsorption Boehmite Copper Electron spin resonance Gibbsite Glycine Hydrolysis
2012/2/2
The adsorption of Cu2+ on microcrystalline gibbsite and boehmite from aqueous solutions having 2/1 and 5/1 glycine/Cu ratios has been studied using electron spin resonance (ESR). The presence of glyci...
Influence of Citric Acid on the Formation of Short-Range Ordered Aluminosilicates
Allophane Aluminosilicate Citric acid Hydroxy-Al Imogolite Noncrystalline Pseudoboehmite
2012/2/2
Reactions between hydroxy-Al ions and orthosilicic acid as influenced by citric acid were studied at an initial Si concentration of 1.6 ?10−3 M, Si/Al molar ratios of 0.5 and 1.0, OH/Al molar ra...
Influence of Inorganic and Organic Ligands on the Formation of Aluminum Hydroxides and Oxyhydroxides
Aluminum hydroxide Boehmite Ligand Precipitation Pseudoboehmite X-ray powder diffraction
2012/1/13
Hydroxide and oxyhydroxide products of aluminum were formed at room temperature at an initial Al concentration of 2 × 10−3 M, pH 8.2, and at varying concentrations of organic and inorganic ligan...
The Influence of Aluminum on Iron Oxides. VIII. Unit-Cell Dimensions of Al-Substituted Goethites and Estimation of Al From Them
Aluminum Goethite Iron Unit-cell dimensions X-ray powder diffraction
2011/11/25
Abstract: The unit-cell dimensions of synthetic, Al-substituted goethites showed that the c dimension is a linear function of Al substitution in the range 0?3 mole % Al, but that the a dimension is va...
Influence of Chloride on the Formation of Iron Oxides from Fe(II) Chloride. II. Effect of [Cl] on the Formation of Lepidocrocite and its Crystallinity
Chloride Green rust Iron oxides Lepidocrocite Oxidation X-ray powder diffraction
2012/2/3
Diffractograms of lepidocrocites formed from the oxidation of Fe(II) chloride solutions at pH 7 and 25∑C showed differential line broadening with (0k0) reflections being much sharper than (hk0) or (hk...
Influence of Chloride on the Formation of Iron Oxides from Fe(II) Chloride. I. Effect of [Cl]/[Fe] on the Formation of Magnetite
Akaganeite Chloride Green rust Iron Lepidocrocite Maghemite Magnetite Synthesis
2012/2/3
The formation of fine-grained magnetite (∼0.1 µm) at pH 7 and 25°C from aeration of Fe(II) chloride solutions is presented. The magnetite converted at 105°C to maghemite with poorly develo...
Influence of Exchangeable Cation Composition on the Size and Shape of Montmorillonite Particles in Dilute Suspension
Exchange cations Light transmission Montmorillonite Particle size Tactoid Viscosity
2011/11/23
Abstract: Viscosity and light-transmission measurements of dilute suspensions of montmorillonites having different exchangeable cations were used to calculate relative particle sizes as a function of ...
Influence of Relative Humidity on the Crystallization of Fe(III) Oxides From Ferrihydrite
Ferrihydrite Goethite Hematite Iron oxides Relative humidity Synthesis
2012/2/7
Ferrihydrite prepared in different manners was kept under relative humidities ranging from 75 to 100% and at temperatures of 45° and 55°C for 180 days. Ferrihydrite transformed to hematite and goethit...
Influence of Silica Content on the Surface Charge Characteristics of Allophanic Clays
Allophane Andisols Desilication Soils Specific surface Zero point of charge
2012/2/7
The surface and charge characteristics of 6 allophanic clays originating from a climatosequence of Andisols have been studied by titration, ion retention, surface area, and reactivity measurements. Se...
Influence of pH, Concentration, and Chelating Power of Organic Anions on the Synthesis of Aluminum Hydroxides and Oxyhydroxides
Aluminum hydroxide Aluminum oxyhydroxide Carboxylic acid Chelation Crystallization Pseudoboehmite
2012/2/9
Chelating organic acids hampered the hydrolytic reactions of Al and affected the nature of the crystalline aluminum hydroxides. Chemical composition, structure, size, nature of functional groups, and ...
The Influence of Aluminum on Iron Oxides. VII. Substitution of Al for Fe in Synthetic Lepidocrocite
Aluminum Goethite Iron Lepidocrocite Substitution Synthesis
2012/2/9
The presence of Al hydroxy species in solution during the synthesis of lepidocrocite had been previously found to influence the reaction towards goethite formation. However, under certain conditions, ...
The Influence of Aluminum on Iron Oxides. VI. The Formation of Fe(II)-Al(III) Hydroxy-Chlorides, -Sulfates, and -Carbonates as New Members of the Pyroaurite Group and Their Significance in Soils
Fe-Al hydroxycarbonate Fe-Al hydroxychloride Fe-Al hydroxysulfate Green rust Iron oxide Pyroaurite
2012/2/9
In the absence of oxygen, Fe(II) chloride, sulfate, and carbonate solutions react at pH 6.5 to 7 with aluminum hydroxide suspensions to form new Fe(II)-Al(III) hydroxy anion compounds of the pyroaurit...
Influence of Organic Anions on the Crystallization of Ferrihydrite
Crystallization Ferrihydrite Goethite Hematite Hydroxy-carboxylic acid
2012/2/10
Hydroxy-carboxylic acids inhibit the crystallization of ferrihydrite in the pH range 9–11 in the order citric > meso tartaric > L-tartaric ≫ lactic and favor hematite formation relative to goeth...