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Synthesis and thermal stability of hydrotalcites containing manganese
Charmarite Rhodochrosite Hydrotalcite Hydrocalumite Synthesis Thermal stability
2011/11/10
The hydrotalcite based upon manganese known as charmarite Mn4Al2(OH)12CO3·3H2O has been synthesised with different Mn/Al ratios from 4:1 to 2:1. Impurities of manganese oxide, rhodochrosite and bayeri...
Formation of Banded Iron-Manganese Structures by Natural Microbial Communities
Bacteria Banded Fe-Mn Structure Biomats Biomineralization Zebra Architecture
2011/12/6
Abstract: Microbial structures in the form of banded zebra patterns have been found as periodic iron-manganese layers in living biomats on the coast of Satsuma-Iwo Jima, a small volcanic island near s...
Involvement of genes of the two-step protein secretion pathway in the transport of the manganese-oxidizing factor across the outer membrane of Pseudomonas putida strain GB-1
Involvement of genes two-step protein secretion pathway transport manganese-oxidizing factor Pseudomonas putida strain GB-1
2012/4/1
Microorganisms can accelerate the rate of Mn21 oxidation by up to five orders of mag-nitude compared to abiotic Mn21 oxidation. Mn21 oxidation in Pseudomonas putida strain GB-1 involves an enzyme inco...
Characterization of Iron-Manganese Concretions in Kentucky Alfisols with Perched Water Tables
Elemental Composition Fractionation Micromorphology Mineralogy
2011/12/22
Abstract: Iron-manganese concretions are common in upper sola of Alfisols in the Inner Bluegrass Region of Kentucky. Their nature and quantities appear to be related to the fluctuation of seasonal per...
Transformations of Synthetic Birnessite as Affected by pH and Manganese Concentration
Birnessite Manganese oxides Mn2+ concentration pH Structural conversion TEM XRD
2011/12/29
The amount of Mn2+ adsorbed or removed from solution by birnessite is several times greater than its reported cation exchange capacity. Extractability of the sorbed Mn2+ decreases with aging. It is un...
Residual Manganese(II) Entrapped in Single-Layer-Hydrate Montmorillonite Interlayers
Electron paramagnetic resonance Mn(II) coordination Montmorillonite
2011/12/30
Electron paramagnetic resonance (EPR) and Fourier transform infrared (FTIR) spectroscopy in combination with X-ray diffractometry and thermal methods were used to determine the coordination of residua...
Oxidation of Phenol in Acidic Aqueous Suspensions of Manganese Oxides
Buserite Feitknechtite Manganese oxide Manganite Oxidation Phenol Quinones Reduction potential
2011/12/30
Phenol (benzenol) oxidation by three synthetic manganese oxides (buserite, manganite, and feitknechtite) has been studied in aerated, aqueous, acidified suspensions. The rate of reaction was pH depend...
Characteristics of Products from the Acid Ammonium Oxalate Treatment of Manganese Minerals
Acid ammonium oxalate Dissolution Grinding Manganese oxides Surface area X-ray powder diffraction
2011/12/31
To determine the parameters that control the attack of Mn minerals by acid ammonium oxalate in darkness (AAOD), rhodochrosite, pyrolusite, manganosite, hausmannite, and bixbyite were shaken with AAOD ...
Effect of Cysteine and Manganese on the Crystallization of Noncrystalline Iron(III) Hydroxide at pH 8
Crystallization Cysteine Ferrihydrite Goethite Iron oxides Manganese
2011/11/30
Abstract: To provide a greater understanding of the crystallization of iron oxides under natural aqueous conditions, the combined effect of an inorganic ion (Mn2+) and a reducing organic ligand (L-cys...
Influence of Manganese Oxide Minerals on the Formation of Iron Oxides
Akaganeite Cryptomelane Feroxyhyte Hausmannite Iron oxides Manganese Oxidation-reduction Pyrolusite Synthesis
2012/1/10
The influence of manganese oxide minerals (cryptomelane, hausmannite, and pyrolusite) on the formation of iron oxides was studied in the FeCl2-NH4OH system at different Mn/Fe molar ratios (0, 0.01, 0....
Weathering Sequence and Alteration Products in the Genesis of the Graskop Manganese Residua, Republic of South Africa
Birnessite Dolomite Infrared spectroscopy Manganese Nsutite Petrography Wad Weathering X-ray powder diffraction
2012/1/10
Although numerous, small, manganese oxide deposits associated with dolomite in the Eastern Transvaal escarpment, Republic of South Africa, have been known for many years, their mineralogical make-up i...
Effect of Manganese on the Transformation of Ferrihydrite into Goethite and Jacobsite in Alkaline Media
Ferrihydrite Goethite Jacobsite Manganese Phyllomanganate Synthesis Transmission electron microscopy
2011/11/25
Abstract: In the presence of Mn(II), ferrihydrite transforms into Mn-goethite and/or jacobsite. Chemical analysis showed that as much as 15 mole % Mn replaced Fe in the goethite structure. If Mn(III) ...
Co, Cu, Ni, and Ca Sorption by a Mixed Suspension of Smectite and Hydrous Manganese Dioxide
Adsorption Analytical transmission electron microscopy Birnessite Cation exchange Manganese oxide Montmorillonite Transition metals
2012/1/13
The sorption properties of Co, Cu, Ni, and Ca were studied in a mixed mineral suspension of synthetic MnO2 and Wyoming montmorillonite. The distribution of the sorbed cations between the two solid pha...
Role of Manganese in the Oxidation of Arsenite by Freshwater Lake Sediments
Arsenic Lake sediments Manganese Oxidation
2012/2/8
The importance of various sediment components in the oxidation of As(III) (arsenite) to As(V) (arsenate) by freshwater lake sediments in southern Saskatchewan was examined. Treating the sediments with...
Manganese Minerals in Clays: A Review
Birnessite Ca-birnessite Manganese Rancieite Todorokite Vernadite
2012/2/9
Vernadite (MnO2 · nH2O) is a mineral with a poorly ordered structure. Its synthetic analogue is designated ヤ-MnO2. Birnessite and vernadite are independent mineral species and cannot be described furt...