Journal ArticleDOI
Insights into the crystal and aggregate structure of Fe3+ oxide/silica co-precipitates
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TLDR
In this paper, structural characteristics of Fe{sup 3+} oxide/silica co-precipitates were investigated and several previously undetermined key insights were gained into the structure of iron oxide and silica coprecimitates through this examination.Abstract:
Structural characteristics of Fe{sup 3+} oxide/silica co-precipitates were investigated. The association between these materials is relevant to practically all natural aqueous systems due to the prevalence of iron and silicon in the Earth's crust. Crystallographic information is very difficult to obtain from these precipitates due to the nanocrystalline nature of ferrihydrite and the amorphous structure of precipitated silica. Several previously undetermined key insights were gained into the structure of iron oxide/silica co-precipitates through this examination. The distribution of iron and silicon throughout co-precipitate particles is illustrated along with the influence of their association. Evidence to the governing factor behind differences in apparent crystallinity is also presented. This information culminates in the formulation of a precipitation pathway, displaying the formation of the co-precipitates.read more
Citations
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Properties of impurity-bearing ferrihydrite III. Effects of Si on the structure of 2-line ferrihydrite
TL;DR: In this article, the effects of Si (at concentrations ranging from 5 to 40 mol% Si) on synthetic ferrihydrite precipitates using structural data derived from synchrotron-based high energy X-ray scattering and pair distribution function (PDF) analysis, in combination with XANES spectroscopy, and transmission electron microscopy (TEM).
Journal ArticleDOI
Structure of Fe(III) precipitates generated by the electrolytic dissolution of Fe(0) in the presence of groundwater ions
TL;DR: In this paper, the authors applied Fe K-edge extended X-ray absorption fine structure (EXAFS) spectroscopy and pair distribution function (PDF) analysis of high-energy Xray scattering to investigate the effects of bivalent cation-oxyanion pairs on the structure of Fe(III) precipitates formed from the oxidation of Fe (II) generated by the electrolytic dissolution of Fe 0) electrodes.
Journal ArticleDOI
Formation and secondary mineralization of ferrihydrite in the presence of silicate and Mn(II)
Xiaoming Wang,Xiaoming Wang,Mengqiang Zhu,Shuai Lan,Matthew Ginder-Vogel,Fan Liu,Xionghan Feng +6 more
TL;DR: In this paper, the authors examined the effects of Fe(III) hydrolysis rate and dissolved Si concentration on ferrihydrite formation, as well as the effect of aqueous Mn(II) on the transformation of 2LFh.
Journal ArticleDOI
Iron and Carbon Dynamics during Aging and Reductive Transformation of Biogenic Ferrihydrite
TL;DR: Bulk and submicron-scale spectroscopic synchrotron methods are used to examine the in situ transformation of OM-bearing, biogenic ferrihydrite stalks, which formed following injection of oxygenated groundwater into a saturated alluvial aquifer at the Rifle, CO field site.
Journal ArticleDOI
Redoximorphic Bt horizons of the Calhoun CZO soils exhibit depth-dependent iron-oxide crystallinity
TL;DR: In this article, the authors investigated Fe solid phase speciation as a function of soil depth in a redoximorphic upland soil profile, which displayed alternating Fe-enriched and Fe-depleted zones of the Bt horizons with platy structure from 56 to 183 cm depth at the Calhoun Critical Zone Observatory in South Carolina, USA.
References
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Book
The iron oxides: structure, properties, reactions, occurrences and uses.
R. M. Cornell,Udo Schwertmann +1 more
TL;DR: In this article, the authors introduce the concept of iron oxides and their properties, including surface chemistry and Colloidal stability, as well as their properties in terms of surface area and porosity.
Journal ArticleDOI
Two-dimensional detector software: From real detector to idealised image or two-theta scan
TL;DR: Calibration methods and software have been developed for single crystal diffraction experiments, using both approaches for calibrate, and apply corrections, to obtain accurate angle and intensity information.
Journal ArticleDOI
PDFfit2 and PDFgui: computer programs for studying nanostructure in crystals
Christopher L. Farrow,Pavol Juhas,J W Liu,D Bryndin,E. S. Božin,Jacques Bloch,Th. Proffen,Simon J. L. Billinge +7 more
TL;DR: PDFfit2 is a program as well as a library for real-space refinement of crystal structures capable of fitting a theoretical three-dimensional structure to atomic pair distribution function data and is ideal for nanoscale investigations.
Book
Underneath the Bragg Peaks: Structural Analysis of Complex Materials
TL;DR: Egami and Billinge as discussed by the authors proposed a structural determination of crystalline solids with extensive disorder using modern tools of structural characterization, such as PDF analysis, and received the 2010 J. D. Hanawalt Award from the International Union of Crystallography.
Book
The iron oxides: structure, properties, reactions, occurrence and uses.
R. M. Cornell,Udo Schwertmann +1 more
TL;DR: An essential volume in industry and to all researchers who, whatever their background and level of experience, are interested in this rapidly expanding field as discussed by the authors, is a good resource for anyone interested in the field.
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The iron oxides: structure, properties, reactions, occurrences and uses.
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