Lattice vibration spectra. Part XCV. Infrared spectroscopic studies on the iron oxide hydroxides goethite (α), akaganéite (β), lepidocrocite (γ), and feroxyhite (δ)

Weckler, B.; Lutz, H. D.

doi:10.1016/s0992-4361(99)80017-4

Cited by 181 publications

(104 citation statements)

References 44 publications

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“…41,43,45 Also, the studied materials demonstrate bands at 3450, 3000-2800, 1620, and 1380 cm -1 in the region of 600-4000 cm -1 . The bands at 3450 and 1620 cm -1 result from bending vibrations of hydrogen-bonded hydroxyl groups and physically adsorbed water on the surface of the samples, respectively.…”

Section: Description Of the Studied Samplesmentioning

confidence: 72%

Treatment of Biogenic Iron-Containing Materials

Shopska¹,

Cherkezova‐Zheleva²,

Paneva³

et al. 2014

Croat. Chem. Acta

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Abstract. Biogenic iron oxides could find application in catalysis but their structure and composition should be well characterized. The content of organic rests due to their origin should also be controlled. Samples of natural biomass and biomass obtained after cultivation in Adler's medium of the SphaerotilusLeptothrix group of bacteria were treated by different techniques to reduce or totally remove the organic residues. The aim of the study was to find procedures, which prevent changes in the oxidation state of the iron and of the type of iron-containing compound(s) during treatment. Mössbauer spectroscopy, IRS, DTA, and SEM were used in the study. Chemical treatment with H 2 O 2 or NaOH at room temperature did not significantly change the samples. Thermal treatment in oxidative flow mixture conducted up to 250 °C resulted in a transformation of the iron-containing phases only. The organic matter, which is included in the structure of the particles, cannot easily be affected. DTA revealed that removal of organic rests occurred in the interval of 250-600 °C. However, the transformation of the initial compounds could not be prevented using such a treatment.

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Section: Description Of the Studied Samplesmentioning

confidence: 72%

Treatment of Biogenic Iron-Containing Materials

Shopska¹,

Cherkezova‐Zheleva²,

Paneva³

et al. 2014

Croat. Chem. Acta

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“…as a wide absorption band with a maximum at 3158 stretching vibrations of H-O bonds [13]. Additionally, the spectrum of this sample contains weaker absorption bands with ν 1053, 1137 and 1160 cm −1 , which can be attributed to the stretching vibrations of (SO 4 ) 2− ions [14].…”

Section: Fig 2 the Average Crystal Size D (Nm) Of Phases Formed Inmentioning

confidence: 79%

Nanodisperse oxide compounds of iron formed in the FeSO4 – KOH – H2O – H2O2 system (4.0 ≤ pH ≤ 13.0)

Жеребцов¹,

Мирасов²,

Kleschev³

et al. 2015

Nanosist.: fiz. him. mat.

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The regularities of phase formation during oxidation of aqueous solutions of FeSO 4 and (or) suspensions of Fe(OH) 2 at quasi-constant temperature and pH values have been studied for wide intervals of temperature (20 -85• C) and (4.0 -13.0) of the reaction medium. The produced nanodisperse materials have been examined by X-ray phase analysis, IR spectroscopy, scanning electron microscopy and X-ray fluorescence analysis, as well as by thermogravimetric analysis combined with thermal analysis and mass spectrometric analysis of released gases. The dependences of the phase, chemical and disperse compositions of the formed precipitates on the synthesis parameters have been revealed.

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“…Four main absorption peaks are observed at approximately 1142, 1023, 750, and 583 cm À1 , which is characteristic of the bonding structure in -FeOOH. [20][21][22] The absorption band at approximately 1142 cm À1 is assigned to the in-plane Fe-O-H bending vibration, and it is shifted to a À1 is observed in Fig. 5(c), which is caused by Fe-O-Si bending vibration.…”

Section: Infrared Spectramentioning

confidence: 97%

Atomic-Scale Structure and Morphology of Ferric Oxyhydroxides Formed by Corrosion of an Iron–Silicon Alloy

et al. 2006

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Quantitative X-ray structural analysis using an in-house X-ray diffraction apparatus has been used for characterizing the atomic-scale structure of the -FeOOH (lepidocrocite) particles prepared by dipping a pure iron and an iron-silicon alloy into aqueous solutions containing sodium chloride. The morphology of the -FeOOH particles was observed by transmission electron microscopy (TEM), and their bonding structure were analyzed using Fourier transform infrared spectroscopy (FT-IR). The realistic atomic-scale structures in the -FeOOH particles were estimated by fitting the interference functions with the help of the reverse Monte Carlo (RMC) simulation technique. The results showed that the linkages of fundamental FeO 6 octahedral units in the particles were deviated from the ideal crystal structure. The structural deviation is considered to be due to the incorporation of foreign ions during the formation of these particles in the aqueous solutions.

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Lattice vibration spectra. Part XCV. Infrared spectroscopic studies on the iron oxide hydroxides goethite (α), akaganéite (β), lepidocrocite (γ), and feroxyhite (δ)

Cited by 181 publications

References 44 publications

Treatment of Biogenic Iron-Containing Materials

Treatment of Biogenic Iron-Containing Materials

Nanodisperse oxide compounds of iron formed in the FeSO4 – KOH – H2O – H2O2 system (4.0 ≤ pH ≤ 13.0)

Atomic-Scale Structure and Morphology of Ferric Oxyhydroxides Formed by Corrosion of an Iron–Silicon Alloy

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Lattice vibration spectra. Part XCV. Infrared spectroscopic studies on the iron oxide hydroxides goethite (α), akaganéite (β), lepidocrocite (γ), and feroxyhite (δ)

Cited by 181 publications

References 44 publications

Treatment of Biogenic Iron-Containing Materials

Treatment of Biogenic Iron-Containing Materials

Nanodisperse oxide compounds of iron formed in the FeSO4 – KOH – H2O – H2O2 system (4.0 ≤ pH ≤ 13.0)

Atomic-Scale Structure and Morphology of Ferric Oxyhydroxides Formed by Corrosion of an Iron&ndash;Silicon Alloy

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Atomic-Scale Structure and Morphology of Ferric Oxyhydroxides Formed by Corrosion of an Iron–Silicon Alloy