The influence of inorganic phosphate on the crystallization of magnetite (Fe3O4) from aqueous solution

Couling, Suzanne B.; Mann, Stephen

doi:10.1039/c39850001713

Cited by 45 publications

(29 citation statements)

References 1 publication

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“…The concentration of HCl-extractable Fe(II) in this study was similar to those obtained by ferrihydrite reduction in the presence and absence of 4 mM phosphate (1). Although the high concentrations of Fe(II) in both systems are conducive to magnetite precipitation, the strong surface complexation of phosphate with ferrihydrite might suppress the transformation of ferrihydrite to magnetite in the systems containing phosphate (27).…”

Section: Resultssupporting

confidence: 82%

Secondary Mineralization of Ferrihydrite Affects Microbial Methanogenesis in Geobacter-Methanosarcina Cocultures

Tang

et al. 2016

Appl Environ Microbiol

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The transformation of ferrihydrite to stable iron oxides over time has important consequences for biogeochemical cycling of many metals and nutrients. The response of methanogenic activity to the presence of iron oxides depends on the type of iron mineral, but the effects of changes in iron mineralogy on methanogenesis have not been characterized. To address these issues, we constructed methanogenic cocultures of Geobacter and Methanosarcina strains with different ferrihydrite mineralization pathways. In this system, secondary mineralization products from ferrihydrite are regulated by the presence or absence of phosphate. In cultures producing magnetite as the secondary mineralization product, the rates of methanogenesis from acetate and ethanol increased by 30.2% and 135.3%, respectively, compared with a control lacking ferrihydrite. Biogenic magnetite was proposed to promote direct interspecies electron transfer between Geobacter and Methanosarcina in a manner similar to that of ctype cytochrome and thus facilitate methanogenesis. Vivianite biomineralization from ferrihydrite in the presence of phosphate did not significantly influence the methanogenesis processes. The correlation between magnetite occurrence and facilitated methanogenesis was supported by increased rates of methane production from acetate and ethanol with magnetite supplementation in the defined cocultures. Our data provide a new perspective on the important role of iron biomineralization in biogeochemical cycling of carbon in diverse anaerobic environments. IMPORTANCE It has been found that microbial methanogenesis is affected by the presence of iron minerals, and their influences on methano-

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Section: Resultssupporting

confidence: 82%

Secondary Mineralization of Ferrihydrite Affects Microbial Methanogenesis in Geobacter-Methanosarcina Cocultures

Tang

et al. 2016

Appl Environ Microbiol

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“…Strong surface complexation of P with ferrihydrite apparently prevents the solid-state transformation of ferrihydrite to magnetite (Couling and Mann, 1985). The adsorption densities and aqueous concentration range over which P inhibits magnetite formation have not been established in either abiotic or biotic systems.…”

Section: Effect Of Pmentioning

confidence: 99%

“…Under identical conditions, but in the absence of P, magnetite is the predominant bacterial transformation product of ferrihydrite . Magnetite is thermodynamically more stable than GR (Génin et al, 1998), but P apparently impedes magnetite formation (Couling and Mann, 1985;Fredrickson et al, 1998). In contrast, GR was found as a primary anoxic transformation product of lepidocrocite by S. putrefaciens strain CIP in the absence of P (Ona- Nguema et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Biotransformation of two-line silica-ferrihydrite by a dissimilatory Fe(III)-reducing bacterium: formation of carbonate green rust in the presence of phosphate

Kukkadapu

Zachara

Fredrickson

et al. 2004

Geochimica et Cosmochimica Acta

170

169

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Abstract-The reductive biotransformation of two Si-ferrihydrite coprecipitates (1 and 5 mole % Si) by Shewanella putrefaciens, strain CN32, was investigated in 1,4-piperazinediethanesulfonic acid-buffered media (pH ϳ7) with lactate as the electron donor. Anthraquinone-2,6-disulfonate, an electron shuttle, was present in the media. Experiments were performed without and with PO 4 3Ϫ (P) (1 to 20 mmol/L) in media containing 50 mmol/L Fe. Our objectives were to define the combined effects of SiO 4 4Ϫ (Si) and P on the bioreducibility and biomineralization of ferrihydrites under anoxic conditions. Iron reduction was measured as a function of time, solids were characterized by powder X-ray diffraction and Mössbauer spectroscopy, and aqueous solutions were analyzed for Si, P, Cl Ϫ and inorganic carbon. Both of the ferrihydrites were rapidly reduced regardless of the Si and P content. Si concentration had no effect on the reduction rate or mineralization products. Magnetite was formed in the absence of P whereas carbonate green rust GR( ) varied with P concentration; the ratio was 2 in 1 mmol/L P and approached 1 with 4-and 10 mmol/L P. Green rust appeared to form by solid-state transformation of ferrihydrite. Media P and Si concentration dictated the mechanism of transformation. In the 1 mole % Si coprecipitate with 1 mmol/L P, an intermediate Fe(II)/Fe(III) phase with structural Fe(II) slowly transformed to GR with time. In contrast, when ferrihydrite contained more Si (5 mole %) and/or contained higher P (4 mmol/L), sorbed Fe(II) and residual ferrihydrite together transformed to GR. Despite similar chemistries, P was shown to have a profound effect on extent of ferrihydrite reduction and biotransformations while that of Si was minimal.

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“…Secondly, the polymer particles are separated by filtration and washed thoroughly with water until no iron is further detected in the eluent. Third, the oxidation of the ferrous ion was performed in alkaline medium at about pH 13 following a standard recipe [8]. The as-produced black composite was filtered, washed to neutral pH and dried at 60 • C, in air.…”

Section: Methodsmentioning

confidence: 99%

Characterization of magnetite nanoparticles supported in sulfonated styrene-divinylbenzene mesoporous copolymer

et al. 2009

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The chemical co-precipitation process was used to synthesize (in situ) spherical iron-oxide nanoparticle in sulfonated styrene-divinylbenzene polymeric template. X-ray diffraction technique supports the magnetite phase formation with a mean particle diameter of about 19 nm. The analysis of Mössbauer spectra is consistent with two magnetic splitting patterns assigned to A-and B-iron sites of magnetite, with no visible magnetic relaxation effect even at 297 K. Considering the different experimental time window between Mössbauer spectroscopy and DC magnetization, the results obtained from both techniques are in very good agreement. Magnetic data suggest hosting magnetite nanoparticles interacting antiferromagnetically.

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The influence of inorganic phosphate on the crystallization of magnetite (Fe3O4) from aqueous solution

Cited by 45 publications

References 1 publication

Secondary Mineralization of Ferrihydrite Affects Microbial Methanogenesis in Geobacter-Methanosarcina Cocultures

Secondary Mineralization of Ferrihydrite Affects Microbial Methanogenesis in Geobacter-Methanosarcina Cocultures

Biotransformation of two-line silica-ferrihydrite by a dissimilatory Fe(III)-reducing bacterium: formation of carbonate green rust in the presence of phosphate

Characterization of magnetite nanoparticles supported in sulfonated styrene-divinylbenzene mesoporous copolymer

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