Ferrihydrite reactivity toward carbon dioxide

Hausner, Douglas B.; Bhandari, Narayan; Pierre-Louis, Andro-Marc; Kubicki, James D.; Strongin, Daniel R.

doi:10.1016/j.jcis.2009.05.069

Cited by 85 publications

(104 citation statements)

References 48 publications

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“…Ferrihydrite identification was also attained by ATR-FTIR spectroscopy, which shows the characteristic bands for this material as reported previously by Hausner et al (2009), and no major distinction between the FFh and AFh (Figure 9). Three predominant regions may be identified in the spectra: (i) near 3150 cm -1 the O-H stretching signals appear in a very broad band, related to structural hydroxide as well as adsorbed H 2 O; (ii) between 1650 and 1300 cm -1 , deformation water bending vibrations appears near 1630 cm -1 , and the asymmetric and symmetric stretching of C-O from adsorbed carbonate may be observed at 1465 and 1345 cm -1 , respectively (Bargar et al, 2005;Hausner, et al, 2009); (iii) Fe-O lattice stretching modes appear at 705, 565, 480 and 420 cm -1 .…”

Section: Attenuated Total Reflectance-fourier Transform Infrared (Atrsupporting

confidence: 76%

“…Three predominant regions may be identified in the spectra: (i) near 3150 cm -1 the O-H stretching signals appear in a very broad band, related to structural hydroxide as well as adsorbed H 2 O; (ii) between 1650 and 1300 cm -1 , deformation water bending vibrations appears near 1630 cm -1 , and the asymmetric and symmetric stretching of C-O from adsorbed carbonate may be observed at 1465 and 1345 cm -1 , respectively (Bargar et al, 2005;Hausner, et al, 2009); (iii) Fe-O lattice stretching modes appear at 705, 565, 480 and 420 cm -1 . However, factors such as the degree of crystallinity and extent of particle aggregation have all been shown to influence the infrared spectrum of iron oxide minerals, and therefore for 2-line ferrihydrite those signals are not well defined (Hausner et al, 2009).…”

Section: Attenuated Total Reflectance-fourier Transform Infrared (Atrmentioning

confidence: 99%

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Laboratory synthesis of goethite and ferrihydrite of controlled particle sizes

Villacís-García¹,

Ugalde-Arzate²,

Vaca-Escobar³

et al. 2015

BSGM

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Iron oxyhydroxides, such as goethite and ferrihydrite, are highly abundant and ubiquitous minerals in geochemical environments. Because of their small particle sizes, their surface reactivity is high towards adsorption of anions and cations of environmental relevance. For this reason these minerals are extensively studied in environmental geochemistry, and also are very important for environmental and industrial applications. In the present work, we report the synthesis and characterization of goethite and ferrihydrite of controlled particle sizes. It has been shown that surface reactivity of these minerals is highly dependent on crystal sizes, even after normalizing by specific surface area. In order to investigate the reasons for this changing reactivity it is necessary to work with reproducible particle sizes of these minerals. We investigated here the experimental conditions to synthesize goethite samples of four different specific surface areas: ca. 40, 60, 80 and 100 m 2 g -1 , through the controlled speed of hydroxide addition during hydrolysis of acid Fe(III) solutions. In the case of 2-line ferrihydrite, samples with two different particle sizes were prepared by changing the aging time under the pH conditions of synthesis (pH = 7.5). The synthesized minerals were identified and characterized by: X-ray diffraction, N 2 adsorption BET specific surface area, transmission electron microscopy, attenuated total reflectance Fourier transform infrared spectroscopy, and maximum Cr(VI) adsorption.Keywords: synthesis, iron oxides, specific surface area, goethite, ferrihydrite, particle size. Resumen

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Section: Attenuated Total Reflectance-fourier Transform Infrared (Atrsupporting

confidence: 76%

Section: Attenuated Total Reflectance-fourier Transform Infrared (Atrmentioning

confidence: 99%

Laboratory synthesis of goethite and ferrihydrite of controlled particle sizes

Villacís-García¹,

Ugalde-Arzate²,

Vaca-Escobar³

et al. 2015

BSGM

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“…1). The C-O stretches probably stemmed from adsorbed carbonate of ambient CO 2 (Hausner et al, 2009 The FTIR spectrum of pure Gohy humic acids (Fig. 1B) showed aliphatic C-H stretching modes at 2928 cm -1 (Xiaoli et al, 2013) and symmetric stretching modes of COO…”

Section: Sample Characterizationmentioning

confidence: 99%

Citrate influences microbial Fe hydroxide reduction via a dissolution–disaggregation mechanism

Braunschweig

Klier

Schröder

et al. 2014

Geochimica et Cosmochimica Acta

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Please cite this article as: Braunschweig, J., Klier, C., Schröder, C., Händel, M., Bosch, J., Totsche, K.U., Meckenstock, R.U., Citrate influences microbial Fe hydroxide reduction via a dissolution-disaggregation mechanism, Geochimica et Cosmochimica Acta (2014), doi: http://dx.doi.org/10.1016/j.gca. 2014.05.006 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Modelling of abiotic dissolution kinetics revealed that colloid stabilization was most pronounced at citrate:Fe ratios of 0.1 -0.5, whereas higher ratios led to enhanced dissolution of both colloidal and larger aggregated fractions. Mathematical simulation of the microbial reduction kinetics under consideration of partial dissolution and colloid stabilization showed that the bioaccessibility increases in the order large aggregates < stable colloids < Fe-citrate.These findings indicate that much of the organic acid driven mobilization of Fe oxy(hydr)oxides is most likely due to colloid formation and stabilization rather than solubilisation.

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“…Ferrihydrite has a large adsorption capacity for the anions and cations present in natural systems since it presents an extremely high surface area and reactivity. Numerous studies can be found in the literature studying the adsorption of different anions and cations onto ferrihydrite [2][3][4][5][6]. However, application of surface complexation models (SCM) to describe the adsorption behavior of ferrihydrite is challenging due to the limited and controversial knowledge of the ferrihydrite structure.…”

Section: Introductionmentioning

confidence: 99%