• Ferrihydrite - Wikipedia

    en.wikipedia.org/wiki/Ferrihydrite Ferrihydrite (Fh) is a widespread hydrous ferric oxyhydroxide mineral at the Earth's surface, and a likely constituent in extraterrestrial materials. It forms in several types of environments, from freshwater to marine systems, aquifers to hydrothermal hot springs and scales, soils, and areas affected by mining.It can be precipitated directly from oxygenated iron-rich aqueous solutions, or by ...
  • Ferrihydrite - an overview | ScienceDirect Topics

    www.sciencedirect.com/topics/earth-and-planetary-sciences/ferrihydrite Ferrihydrite is a precursor for goethite and hematite. Its large surface area and reactivity allow it to serve as sink for nutrients and metals. In addition, the higher surface area enhances the contact between water and ferrihydrite. Another iron-based material is the ferrite which is formed by combination of transition metal and iron oxide.
  • Ferrihydrite: Mineral information, data and localities.

    www.mindat.org/min-1493.html It is a metastable nanomineral precursor to other minerals, e.g. hematite, goethite. There are no known deposits of ferrihydrite before the Pleistocene. Two structure models have been proposed: the "f-phase" model and the "akdalaite" model; the first one seems to be correct (Paktunc et al., 2013).
  • Ferrihydrite Mineral Data

    webmineral.com/data/Ferrihydrite.shtml Ferrihydrite Crystallography: Axial Ratios: a:c = 1:3.17567 : Cell Dimensions: a = 2.96, c = 9.4, Z = 1; V = 71.33 Den(Calc)= 3.93 : Crystal System:
  • Ferrihydrite - The Strongin Research Group

    sites.temple.edu/strongingroup/research-projects/ferrihydrite Ferrihydrite is the mineral name given to nanoscale iron oxyhydroxides, but multiple variations exist. The number of reflections observed with X-ray diffraction is conventionally used to differentiate between ferrihydrites with 2-line and 6-line being the most common. It is obvious that the primary difference between 2 and 6-line is the degree ...
  • Ferrihydrite - Assignment Point

    www.assignmentpoint.com/science/geographic-minerals/ferrihydrite.html Ferrihydrite (Fh) is a widespread hydrous ferric oxyhydroxide mineral at the Earth’s surface and a likely constituent in extraterrestrial materials.Ferrihydrite is a metastable mineral. It is known to be a precursor of more crystalline minerals like hematite and goethite by aggregation-based crystal growth.
  • Ferrihydrite Mineral Data - webmin.mindat.org

    webmin.mindat.org/data/Ferrihydrite.shtml General Ferrihydrite Information : Chemical Formula: Fe+++2O3•0.5(H2O) Composition: Molecular Weight = 168.70 gm Iron 66.21 % Fe 94.66 % Fe 2 O 3: Hydrogen 0.60 % H 5.34 % H 2 O: Oxygen 33.19 % O: 100.00 % 100.00 % = TOTAL OXIDE

    clays.org/journal/archive/volume%2042/42-6-737.pdf FERRIHYDRITE: SURFACE STRUCTURE AND ITS EFFECTS ON PHASE TRANSFORMATION JIANMIN ZHAO, FRANK E. HUGGrNS, ZHEN FENG, AND GERALD P. HUFFMAN The Consortium for Fossil Fuel Liquefaction Science, 341 Bowman Hall, University of Kentucky Lexington, Kentucky 40506 Abstract- X-ray absorption fine structure (XAFS) spectra were collected on a series of ...
  • Ferrihydrite–Humic Associations - Schwertmann - 2005 ...

    acsess.onlinelibrary.wiley.com/doi/abs/10.2136/sssaj2004.0274 However, DOM induced the formation of a four (XRD)‐line ferrihydrite that contained 96 mg C/kg. In contrast to a pure four‐line ferrihydrite, which was completely magnetically ordered at 4.2 K, the synthesized DOM–ferrihydrite was not fully ordered at 4.2 K and had a magnetic hyperfine field 1 to 2 T lower than the pure ferrihydrite.
  • Effect of sulfide on As(III) and As(V) sequestration by ...

    www.sciencedirect.com/science/article/pii/S0045653517310408 Ferrihydrite used in adsorption experiments was synthesized according to the method (Schwertmann and Cornell, 2000) with slight modification. Briefly, FeCl 3 solution was neutralized with NaOH solution to 7.5 under vigorous stirring and stabilized for 2 h. The resulting suspensions were dosed volumetrically to achieve a known concentration of iron.