Physiochemical controls on the crystal-chemistry of Ni in birnessite: Genetic implications for ferromanganese precipitates

Peacock, Caroline L.

doi:10.1016/j.gca.2009.03.020

Cited by 89 publications

(97 citation statements)

References 38 publications

(78 reference statements)

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“…1b) at cation vacancy sites, while 25 % was incorporated into the sheet structure, as inferred from EXAFS-derived NiMn interatomic distances of 3.5 and 2.9 Å, respectively. These two coordination environments also were observed by Manceau et al (2007b) and Peacock and Sherman (2007b) and Peacock (2009) for Ni sorbed by -MnO 2 and hexagonal birnessite (H + -exchanged hexagonal birnessite prepared by acidifying crystalline triclinic Na-birnessite to pH 2), respectively, at very low Ni:Mn molar ratio (< 0.01). At pH 4, Ni was bound predominantly as a TCS complex (> 90 %), whereas at pH 7, variable extents of Ni incorporation (10 -45 %) were observed in samples with a 0.01 Ni: Mn molar ratio.…”

Section: Introductionsupporting

confidence: 55%

“…This lower energy barrier, thus larger rate coefficient, at high pH implies that the ratio of Ni-inc to Ni-TCS should increase with increasing pH in Ni-sorbed birnessite, as is indeed observed experimentally (Manceau et al, 2007b;Peacock and Sherman, 2007b;Peacock, 2009). Lastly, the structural distortion induced among the Mn atoms surrounding the invading Ni atom in Ni-inc may impose a limit on the maximum amount of Ni incorporation that is possible.…”

Section: Dft Geometry Optimizationsmentioning

confidence: 63%

“…At pH 4, Ni was bound predominantly as a TCS complex (> 90 %), whereas at pH 7, variable extents of Ni incorporation (10 -45 %) were observed in samples with a 0.01 Ni: Mn molar ratio. In support of the hypothesis that increased pH favors incorporation, Peacock (2009) observed that the fraction of Ni-inc increased to 20 % when samples initially equilibrated at pH 4 for 24 h were exposed to an electrolyte solution maintained at pH 7 for either 24 or 120 h.…”

Section: Introductionmentioning

confidence: 70%

“…Thus, besides pH and contact time, the formation of Ni-TCS versus Ni-inc in hexagonal birnessite may be influenced by structural disorder in the mineral. Differences between the hexagonal birnessite minerals studied by Manceau et al (2007b) and Peacock (2009) arise with respect to specific surface area and structural disorder, with the -MnO 2 sample employed by Manceau et al (2007b) having a greater surface area and lacking sheet-stacking order along the c-axis direction. The vacancy content of the two minerals may also differ; crystalline hexagonal birnessite has a vacancy content of 16.7 % (Lanson et al, 2000), whereas that of -MnO 2 may lie between 6 and 18 % (Villalobos et al, 2006;Grangeon et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Mechanisms of nickel sorption by a bacteriogenic birnessite

Peña

Kwon

Refson

et al. 2010

Geochimica et Cosmochimica Acta

119

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Bacteriogenic birnessite nanoparticles have a large capacity to adsorb metal cations due to their high proportion of cation vacancy defects. In the current study, a synergistic experimental-computational approach was used to study the molecular-scale mechanisms of Ni sorption at varying loadings and at pH 6-8 using the hexagonal birnessite produced by Pseudomonas putida GB-1. We found that Ni is scavenged effectively by the biomass-

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Section: Introductionsupporting

confidence: 55%

Section: Dft Geometry Optimizationsmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mechanisms of nickel sorption by a bacteriogenic birnessite

Peña

Kwon

Refson

et al. 2010

Geochimica et Cosmochimica Acta

119

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“…The ratio of external to internal Mn sites increases when the crystal size decreases, and biogenic vernadite with a layer dimension of 6-7 nm ) has ~20% of its Mn atoms exposed at the crystal edge compared to ~0.4% for a birnessite layer of ~30 nm in diameter (Lanson et al 2000). Thus, organic pollutants can be degraded and trace metals taken up by vernadite in natural systems (McKenzie 1980;Stone 1987;Stone and Ulrich 1989;Sunda and Kieber 1994;Manceau et al 2003Manceau et al , 2004Manceau et al , 2007aManceau et al , 2007bVillatoro-Monzón et al 2003;Marcus et al 2004a;Tebo et al 2004;Hochella et al 2005aHochella et al , 2005bIsaure et al 2005;Villalobos et al 2005;Peacock and Sherman 2007;Peacock 2009). …”

Section: +mentioning

confidence: 99%

Structure of nanocrystalline phyllomanganates produced by freshwater fungi

Grangeon

Lanson

Miyata

et al. 2010

American Mineralogist

142

134

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The crystal structures of biogenic Mn oxides produced by three fungal strains isolated from stream pebbles were determined using chemical analyses, XANES and EXAFS spectroscopy, and powder X-ray diffraction. The fungi-mediated oxidation of aqueous Mn 2+ produces layered Mn oxides analogous to vernadite, a natural nanostructured and turbostratic variety of birnessite. The crystallites have domain dimensions of ~10 nm in the layer plane (equivalent to ~35 MnO 6 octahedra), and ~1.5-2.2 nm perpendicularly (equivalent to ~2-3 layers), on average. The layers have hexagonal symmetry and from 22 to 30% vacant octahedral sites. This proportion likely includes edge sites, given the extremely small lateral size of the layers. The layer charge deficit, resulting from the missing layer Mn 4+ cations, is balanced mainly by interlayer Mn 3+ cations in triple-corner sharing position above and/or below vacant layer octahedra. The high surface area, defective crystal structure, and mixed Mn valence confer to these bio-minerals an extremely high chemical reactivity. They serve in the environment as sorption substrate for trace elements and possess catalytic redox properties.

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Effects of dry aging and heating on the structural characteristics and transformation of hexagonal turbostratic birnessite

Yin,

Zhang,

Xiang

et al. 2024

Soil Science Soc of Amer J

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Natural birnessite‐like minerals are commonly enriched in various transition metals (TMs), such as Fe. Though the fates of metals associated with birnessites during mineral transformation in aqueous conditions are thoroughly studied, we determined the Fe behaviors in Fe‐doped hexagonal turbostratic birnessites during mineral evolution in dry state at room temperature for 8 years and upon thermal treatments at temperatures ranging from 323–773 K covering the temperatures in extreme environments such as under wildfires. These Fe‐containing birnessites were very stable upon aging in the dry state. Upon thermal treatment, the birnessite sample with a small amount of Fe (≤ 2.8 wt.%) was transformed to cryptomelane at 573–673 K while for the sample with ∼5.6 wt.% Fe the transformation temperature increased to 673–773 K. This indicated that Fe adsorption enhanced the birnessite thermal stability. Further, there was a linear relationship between the fraction of edge‐sharing Fe‐Fe(Mn) pairs and temperature over 298–473 K. This implied the migration of Fe adsorbed on vacancies into birnessite layers and/or increased edge‐sharing of Fe around vacancies from adjacent layers during heating. The average Mn valences in the Mn dioxides were almost constant with the increase of temperature when the layer structure was kept but greatly increased when the tectomanganate was formed. These results provided deep insights into the mechanisms of Mn dioxide mineral transformation and the fates of associated metals under extreme conditions in terrestrial environments. Birnessite structure kept stable during 8 years dry aging. Fe adsorption enhanced birnessite thermal stability. Heating at 298‐473 K promoted the formation of edge‐sharing Fe‐Fe(Mn) pairs in the birnessite structure. Fe‐doped birnessite was converted to cryptomelane after heating at 673‐773 K. Average Mn valences were almost constant in birnessites but were greatly increased for cryptomelanes. This article is protected by copyright. All rights reserved

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Physiochemical controls on the crystal-chemistry of Ni in birnessite: Genetic implications for ferromanganese precipitates

Cited by 89 publications

References 38 publications

Mechanisms of nickel sorption by a bacteriogenic birnessite

Mechanisms of nickel sorption by a bacteriogenic birnessite

Structure of nanocrystalline phyllomanganates produced by freshwater fungi

Effects of dry aging and heating on the structural characteristics and transformation of hexagonal turbostratic birnessite

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