Journal ArticleDOI
Infrared spectroscopy of goethite dehydroxylation: III. FT-IR microscopy of in situ study of the thermal transformation of goethite to hematite
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TLDR
The structural transformation between goethite and hematite through thermal dehydroxylation was interpreted in order to provide criteria that can be used for the characterisation of thermally activated bauxite and their conversion to activated alumina phases.About:
This article is published in Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy.The article was published on 2002-03-15. It has received 191 citations till now. The article focuses on the topics: Infrared microscopy & Hematite.read more
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Arsenate adsorption on an Fe-Ce bimetal oxide adsorbent: Role of surface properties
TL;DR: An Fe-Ce bimetal adsorbent was investigated with X-ray powder diffraction, transmission electron micrograph, Fourier transform infrared spectra, andXPS methods for a better understanding of the effect of surface properties on arsenate (As(V), proving that the adsorption of As(V) by Fe- CeO8 is mainly realized through the mechanism of quantitative ligand exchange.
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Hematite (alpha-Fe2O3) with various morphologies: ionic liquid-assisted synthesis, formation mechanism, and properties.
TL;DR: The alpha-Fe(2)O(3) with various morphologies has been successfully synthesized via an ionic liquid-assisted hydrothermal synthetic method and is expected to be a useful technique for controlling the diverse shapes of crystalline inorganic materials for a variety of applications, including sensors, gas and heavy metal ion adsorbents, catalytic fields, hydrogen and Li ion storage, and controlled drug delivery.
Journal ArticleDOI
Arsenic removal by electrocoagulation using combined Al-Fe electrode system and characterization of products
Jewel A. Gomes,Praveen Daida,Mehmet Kesmez,Michael G. Weir,Hector Moreno,José R. Parga,George Irwin,Hylton McWhinney,Tony Grady,Eric Peterson,David L. Cocke +10 more
TL;DR: The substitution of Fe3+ ions by Al3+ ion in the solid surface has been observed, indicating an alternative removal mechanism of arsenic in these metal hydroxides and oxyhydroxides by providing larger surface area for arsenic adsorption via retarding the crystalline formation of iron oxides.
Journal ArticleDOI
Heated goethite and natural hematite: Can Raman spectroscopy be used to differentiate them?
TL;DR: In this article, the authors used XRD, TEM and TG as supporting techniques to obtain both ex situ and in situ Raman spectra for disordered hematite.
Journal ArticleDOI
Effectiveness and mechanisms of phosphate adsorption on iron-modified biochars derived from waste activated sludge.
Qi Yang,Xiaolin Wang,Wei Luo,Jian Sun,Qiuxiang Xu,Fei Chen,Jianwei Zhao,Shana Wang,Fubing Yao,Dongbo Wang,Xiaoming Li,Guangming Zeng +11 more
TL;DR: Different iron modification was used to improve the phosphate adsorption capacity of waste activated sludge (WAS)-based biochar, and X-ray diffraction analyzes indicated that the iron in FeCl3-impregnated WAS-basedBiochar existed mainly in amorphous phase, as hematite andAmorphous hydroxides forms, which was of great benefit to the phosphate Adsorption.
References
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Book
An Introduction to the Rock-Forming Minerals
TL;DR: In this article, the authors define di-and ring silicates: olivine group humite group zircon sphene (titanite) garnet group, vesuvianite sillimanite, mullite, andalusite, kyanite topaz staurolite, chloritoid epidote group lawsonite, pumpellyite melilite group beryl, cordierite, tourmaline axinite.
Book
Atlas of Infrared Spectroscopy of Clay Minerals and Their Admixtures
TL;DR: In this paper, the authors greatly indebted to Professor Dr. W.A. Flaig, Director of the Institute for Biochemistry, Braunschweig, Germany, Ir. E.C. Rietz and Dr. P. Krohmer, Uberlingen, Germany for critical reading the manuscript.
Journal ArticleDOI
The Influence of Aluminum on Iron Oxides. VIII. Unit-Cell Dimensions of Al-Substituted Goethites and Estimation of Al From Them
TL;DR: In this article, an improved procedure for estimating Al substitution from x-ray powder diffraction positions requires (1) calculation of the c dimension from the positions of the 110 and 111 diffraction lines using the formula: c = (1/d(111)2 − 1/d (110)2)−1/2, and (2) estimation of Al substitutions from the relationship: mole % Al = 1730 − 572.0c.
Journal ArticleDOI
Infrared study of goethites of varying crystallinity and particle size. I: Interpretation of OH and lattice vibration frequencies
TL;DR: In this article, a detailed study of the IR spectrum of goethite is given with the aim of relating variations to crystalline order and particle size, and two different bending modes exist from site group splitting, their active modes from factor group splitting are at lower frequencies than the uncoupled ones.
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The Kinetics and Reaction Mechanism of the Goethite to Hematite Transformation
TL;DR: In this article, a complete mechanism for the transformation of goethite to hematite based on the results of thermogravimetric, transmission electron microscope and X-ray diffraction investigations is presented.
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