Ferrihydrite (Fh) is a widespread hydrous ferric oxyhydroxide mineral at the Earth's surface, [6] [7] and a likely constituent in extraterrestrial materials. [8] 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.

Jun 22, 2007 · Despite the ubiquity of ferrihydrite in natural sediments and its importance as an industrial sorbent, the nanocrystallinity of this iron oxyhydroxide has hampered accurate structure determination by traditional methods that rely on long-range order.

Mar 15, 2013 · Ferrihydrite (Fh) is an yet enigmatic nano Fe(III)-oxide material, omnipresent in nature that can bind ions in large quantities, regulating bioavailability and ion mobility.

Ferrihydrite ((Fe 3+ 10 O 14 (OH) 2)) forms a significant proportion of soils, especially soils formed under cool, moist conditions and it occurs as a pre-terrestrial weathering product in meteorites. It provides the inorganic base of ferritin in biological systems and is present as rust and in acid mine drainage.

It forms by rapid oxidation and hydrolysis, and exists in varying degrees of structure disorder; the two extremes are the so-called 2-line and 6-line ferrihydrites (distinguished by their X-ray powder diffraction patterns). It is a metastable nanomineral precursor to …

Nov 13, 2019 · Ferrihydrite (Fh) is a poorly crystalline Fe(III)-oxyhydroxide found in abundance in soils and sediments. With a high specific surface area and sorption capacity at circumneutral pH, ferrihydrite is an important player in the biogeochemical cycling of nutrients and trace elements in redox-dynamic environments.

Sep 20, 2021 · Ferrihydrite is a poorly crystalline iron oxyhydroxide nanomineral that serves a critical role as the most bioavailable form of ferric iron for living systems. However, its atomic...

A recent study revealed that the red color of Mars could be due to the presence of an iron-containing mineral called ferrihydrite. It is a poorly crystalline nanomineral buildup of about 20% (FeO4) and 80% (FeO6) polyhedra. Formation: It forms by rapid oxidation and hydrolysis, and exists in varying degrees of structure disorder.

Jun 19, 2020 · Hydroxyl groups are the cornerstone species driving catalytic reactions on mineral nanoparticles of Earth’s crust, water, and atmosphere. Here we directly identify populations of these groups on...

Ferrihydrite is a nanoscale iron oxyhydroxide (Fe-O-OH) mineral that is ubiquitous in water and soil systems, and plays an important role in geochemical processes and the fate of contaminants.