Morphologically Tuned Aluminum Hydrous Oxides and Their Calcined Products

2016 ◽  
Vol 99 (7) ◽  
pp. 2273-2282 ◽  
Author(s):  
Sourav Ghosh ◽  
Rituparna Das ◽  
Milan Kanti Naskar
Keyword(s):  
Hydrous Oxides

Hydrous oxides and their cation-exchange properties

1965 ◽  
Vol 15 (10) ◽  
pp. 445-448 ◽  
Author(s):  
C. Heitner-Wirguin ◽  
A. Albu-Yaron
Keyword(s):  
Cation Exchange ◽  
Hydrous Oxides ◽  
Exchange Properties

scholarly journals Efficacy of a Phosphate-Charged Soil Material in Supplying Phosphate for Plant Growth in Soilless Root Media

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Young-Mi Oh ◽  
Paul V. Nelson ◽  
Dean L. Hesterberg ◽  
Carl E. Niedziela
Keyword(s):  
Plant Growth ◽  
Solution Concentration ◽  
Bulk Solution ◽  
P Deficiency ◽  
Soil Material ◽  
Hydrous Oxides ◽  
Acceptable Range ◽  
Root Media ◽  
Phosphate Fertilization ◽  
Phosphate Leaching

A soil material high in crystalline Fe hydrous oxides and noncrystalline Al hydrous oxides collected from the Bw horizon of a Hemcross soil containing allophane from the state of Oregon was charged with phosphate-P at rates of 0, 2.2, and 6.5 mg·g−1, added to a soilless root medium at 5% and 10% by volume, and evaluated for its potential to supply phosphate at a low, stable concentration during 14 weeks of tomato (Solanum esculentumL.) seedling growth. Incorporation of the soil material improved pH stability, whether it was charged with phosphate or not. Bulk solution phosphate-P concentrations in the range of 0.13 to 0.34 mg·dm−3were associated with P deficiency. The only treatment that sustained an adequate bulk solution concentration of phosphate-P above 0.34 mg·dm−3for the 14 weeks of testing contained 10% soil material charged with 6.5 mg·g−1P, but initial dissolved P concentrations were too high (>5 mg·g−1phosphate-P) from the standpoint of phosphate leaching. The treatment amended with 10% soil material charged with 2.2 mg·g−1P maintained phosphate-P within an acceptable range of 0.4 to 2.3 mg·dm−3for 48 d in a medium receiving no postplant phosphate fertilization.

Geochemistry of cobalt, nickel, chromium, and vanadium in the sediments of the estuary and open Gulf of St. Lawrence

1979 ◽  
Vol 16 (6) ◽  
pp. 1196-1209 ◽  
Author(s):  
D. H. Loring
Keyword(s):  
Mineral Deposit ◽  
Source Rocks ◽  
Anthropogenic Sources ◽  
Terrestrial Organic Matter ◽  
Lawrence Estuary ◽  
Fine Grained ◽  
Hydrous Oxides ◽  
High Concentrations ◽  
St Lawrence Estuary ◽  
Local Anomalies

Total Co (3–22 ppm), Ni (4–160 ppm), V (4–168 ppm), and Cr (8–241 ppm) concentrations vary regionally and with textural differences in the sediments of the St. Lawrence estuary and Gulf of St. Lawrence. They are, except for local anomalies, at or near natural levels relative to their source rocks and other marine sediments.Chemical partition and mineralogical analyses indicate that small but biochemically significant quantities (2–24%) of the total element concentrations are potentially available to the biota and are most likely held by fine-grained organic material, hydrous iron oxides, and ion exchange positions in the sediments. In the upper estuary, nondetrital Ni, Cr, and V supplied from natural and anthropogenic (Cr) sources are apparently preferentially scavenged from solution by terrestrial organic matter and hydrous oxides and concentrated in fine-grained sediments deposited below the turbidity maximum. In the lower estuary, the fine-grained sediments are relatively enriched in nondetrital V supplied from anthropogenic sources in the Saguenay system. Elsewhere the sedimentation intensities of the nondetrital elemental contributions have remained relatively constant with fluctuations in total sediment intensity.Seventy-six to 98% of the total Co, Ni, Cr, and V is not, however, available to the biota, but held in various sulphide, oxide, and silicate minerals. The host minerals have accumulated at the same rate as other fine-grained detrital material except for some local anomalies. In the upper estuary, detrital V concentrations are highest in the sands as an apparent result of an enrichment of ilmenite and titaniferous magnetite from a nearby mineral deposit. In the open gulf, relatively high concentrations of Ni, Cr, and V occur in sediments from the Bay of Islands, Newfoundland, and probably result from the seaward dispersal of detrital Ni, Cr, and V bearing minerals from nearby ultrabasic rocks.

The effect of UV light on the hydrous oxides of iridium

1988 ◽  
Vol 257 (1-2) ◽  
pp. 101-121 ◽  
Author(s):  
L.D. Burke ◽  
R.A. Scannell
Keyword(s):  
Uv Light ◽  
Hydrous Oxides

Selenium and Molybdenum Adsorption on Kaolinite Clay Mineral Coated with Hydrous Oxides of Iron and Aluminum

2003 ◽  
pp. 237-249 ◽  
Author(s):  
D. K. Bhumbla ◽  
S. S. Dhaliwal ◽  
K. S. Sajwan ◽  
B. S. Sekhon
Keyword(s):  
Clay Mineral ◽  
Kaolinite Clay ◽  
Hydrous Oxides

Formation of hybrid colloids by suspension polycondensation in the presence of hydrophilic block copolymers

2002 ◽  
Vol 726 ◽  
Author(s):  
Corine Gerardin ◽  
Valérie Buissette ◽  
François Gaudemet ◽  
Olivier Anthony ◽  
Nicolas Sanson ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Colloidal Suspensions ◽  
Surface Charges ◽  
Inorganic Particles ◽  
Hydrous Oxides ◽  
Stabilization Phase ◽  
Metal Ratio ◽  
Forced Hydrolysis ◽  
Hydrolysis Of

AbstractDouble hydrophilic block copolymers were used to control the growth of inorganic particles and directly prepare hybrid colloidal suspensions. Colloids of metal hydrous oxides were obtained by forced hydrolysis of metal ions in presence of the copolymers. The block copolymers contain a metal-complexing polyelectrolyte block and a stabilizing neutral block. The role of the first block is to ensure a controlled growth of the inorganic phase, while simultaneously, the second block ensures the colloidal stabilization. Phase diagrams presenting the conditions under which precipitation is inhibited are established. The nanoparticles are then characterized in terms of sizes, morphologies and surface charges. The main parameters controlling the size were identified: the copolymer-to-metal ratio and the metal prehydrolysis ratio. The synthesis steps were characterized. First, a key step of induced micellization of the hydrophilic copolymers leads to hybrid core-shell assemblies. The second step consists in mineralization of the micellar core. The suspension polycondensation leads to hairy particles whose morphologies depend on the nature of the metal and on synthesis parameters.

scholarly journals On the Occurrence of Sulphur in Marine Muds and Nodules, and its bearing on their Mode of Formation

1892 ◽  
Vol 18 ◽  
pp. 17-39 ◽  
Author(s):  
J. Y. Buchanan
Keyword(s):  
Deep Sea ◽  
Qualitative Composition ◽  
Hydrous Oxides ◽  
Iron And Manganese

In the first section of the cruise of the “Challenger,” that from Tenerife to Sombrero, the existence was established of deep-sea muds, perfectly free from carbonate of lime, consisting mainly of silicates mixed with ochreous material, principally hydrated oxides of iron and manganese, and of local concentrations of these materials in the form of nodules and of coatings or incrustations on dead calcareous matter. The qualitative composition of these concentrations was carefully determined, and it was particularly noted that whether in the form of nodules or of incrustations they were aggregations of the general materials of the bottom, and not concretions or coatings of pure hydrous oxides.

Preparation and properties of monodispersed colloidal metal hydrous oxides

1978 ◽  
Vol 50 (9-10) ◽  
pp. 1193-1210 ◽  
Author(s):  
E. Matijevic
Keyword(s):  
Hydrous Oxides ◽  
Colloidal Metal
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