Phosphate Adsorption Properties of Magnetite-Based Nanoparticles

Daou, T. Jean; Bégin‐Colin, Sylvie; Grenèche, Jean‐Marc; Thomas, Femy; Derory, A.; Bernhardt, Pierre; Légaré, P.; Pourroy, G.

doi:10.1021/cm071046v

Cited by 383 publications

(346 citation statements)

References 82 publications

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“…The apparent sorption of phosphate at circumneutral pH on biogenic magnetite was considerably higher than that reported by Daou et al (2007), which is consistent with the formation of a separate phase, vivianite. Detailed electron microscopy analysis of the phosphate-reacted magnetite sample incubated with U(VI) led to the conclusion that U-P species was formed.…”

Section: Discussionsupporting

confidence: 84%

Products of abiotic U(VI) reduction by biogenic magnetite and vivianite

Veeramani

Alessi

Suvorova

et al. 2011

Geochimica et Cosmochimica Acta

138

122

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Reductive immobilization of uranium by the stimulation of dissimilatory metal-reducing bacteria (DMRB) has been investigated as a remediation strategy for subsurface U(VI) contamination. In those environments, DMRB may utilize a variety of electron acceptors, such as ferric iron which can lead to the formation of reactive biogenic Fe(II) phases. These biogenic phases could potentially mediate abiotic U(VI) reduction. In this work, the DMRB Shewanella putrefaciens strain CN32 was used to synthesize two biogenic Fe(II)-bearing minerals: magnetite (a mixed Fe(II)-Fe(III) oxide) and vivianite (an Fe(II)-phosphate). Analysis of abiotic redox interactions between these biogenic minerals and U(VI) showed that both biogenic minerals reduced U(VI) completely. XAS analysis indicates significant differences in speciation of the reduced uranium after reaction with the two biogenic Fe(II)-bearing minerals. While biogenic magnetite favored the formation of structurally ordered, crystalline UO 2 , biogenic vivianite led to the formation of a monomeric U(IV) species lacking U-U associations in the corresponding EXAFS spectrum. To investigate the role of phosphate in the formation of monomeric U(IV) such as sorbed U(IV) species complexed by mineral surfaces, versus a U(IV) mineral, uranium was reduced by biogenic magnetite that was pre-sorbed with phosphate. XAS analysis of this sample also revealed the formation of monomeric U(IV) species suggesting that the presence of phosphate hinders formation of UO 2 . This work shows that U(VI) reduction products formed during in situ biostimulation can be influenced by the mineralogical and geochemical composition of the surrounding environment, as well as by the interfacial solute-solid chemistry of the solid-phase reductant.

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Section: Discussionsupporting

confidence: 84%

Products of abiotic U(VI) reduction by biogenic magnetite and vivianite

Veeramani

Alessi

Suvorova

et al. 2011

Geochimica et Cosmochimica Acta

138

122

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“…Although no significant traces of Fe oxides were observed in the XRD profile ͑see above͒, the parameters obtained from the analysis of room-temperature Mössbauer spectrum reveal that the Fe-oxide species could be either magnetite ͑Fe 3 O 4 ͒ or maghemite ͑␥-Fe 2 O 3 ͒ but a mixture of both seems rather reasonable because of the oxidation of magnetite into maghemite. 69,70 Therefore, we expect FIM behavior as the T N of these oxides, in the bulk form, are 860 K ͑Fe 3 O 4 ͒ and 1020 K ͑␥-Fe 2 O 3 ͒. However, with respect to the Mössbauer time scale of 10 −8 s, the quadrupolar structure of the Fe oxide displayed at room temperature unequivocally suggests the presence of superparamagnetic ͑SPM͒ fluctuations due to the existence of ultrafine domains while the broad single line does originate from domains the size of which is distributed and slightly larger.…”

Section: Fe Mössbauer Spectrometrymentioning

confidence: 99%

Microstructure and magnetism of nanoparticles withγ-Fecore surrounded byα-Feand iron oxide shells

et al. 2010

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Iron-carbon nanocomposites have been elaborated by means of a simple chemical procedure based on in situ synthesis of iron nanoparticles within the nanopores of an activated carbon. The Fe nanoparticles present a broad particle-size distribution ͑5-40 nm͒. A combined structural and magnetic study seems to suggest that most of the nanoparticles of mean size ϳ15 nm have exotic "onionlike" core-shell morphology of ␥-Fe nucleus surrounded by a concentric double shell of ␣-Fe and maghemitelike oxide. The true nature of Fe-oxide was successfully evidenced through room temperature x-ray absorption spectroscopy. The whole system does not reach a fully superparamagnetic regime even at 750 K, probably due to higher blocking temperatures for the largest nanoparticles. Mössbauer spectrometry indicates that low temperature para-to-antiferromagnetic transition for the ␥-Fe phase cannot be discarded. In addition, the external Fe-oxide shell exhibits spin-glass behavior giving rise to the freezing of its magnetic moments at low temperatures. Hence, we propose a competing double magnetic coupling: ͑i͒ the oxide shell/␣-Fe interaction and ͑ii͒ the possible antiferromagnetic coupling between ␥-Fe nucleus and ␣-Fe layer; as being both responsible for the observed exchange bias effect at T =5 K ͑H ex Ϸ 150 Oe͒.

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“…SRO minerals have been shown to influence nutrient availability in natural soils via sorptive processes (Grand and Lavkulich, 2015), and metal oxide ENMs may also demonstrate this effect. In particular, metal oxides are well known for their ability to covalently adsorb phosphate ions (PO 4 3À ) (Boehm, 1971;Daou et al, 2007) and, depending on the strength of this interaction, may prevent organisms from accessing this important nutrient.…”

Section: Introductionmentioning

confidence: 99%

Gravity-driven transport of three engineered nanomaterials in unsaturated soils and their effects on soil pH and nutrient release

Conway

Keller

2016

Water Research

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a b s t r a c tThe gravity-driven transport of TiO 2 , CeO 2 , and Cu(OH) 2 engineered nanomaterials (ENMs) and their effects on soil pH and nutrient release were measured in three unsaturated soils. ENM transport was found to be highly limited in natural soils collected from farmland and grasslands, with the majority of particles being retained in the upper 0e3 cm of the soil profile, while greater transport depth was seen in a commercial potting soil. Physical straining appeared to be the primary mechanism of retention in natural soils as ENMs immediately formed micron-scale aggregates, which was exacerbated by coating particles with Suwannee River natural organic matter (NOM) which promote steric hindrance. Small changes in soil pH were observed in natural soils contaminated with ENMs that were largely independent of ENM type and concentration, but differed from controls. These changes may have been due to enhanced release of naturally present pH-altering ions (Mg 2þ , H þ ) in the soil via substitution processes.These results suggest ENMs introduced into soil will likely be highly retained near the source zone.

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Phosphate Adsorption Properties of Magnetite-Based Nanoparticles

Cited by 383 publications

References 82 publications

Products of abiotic U(VI) reduction by biogenic magnetite and vivianite

Products of abiotic U(VI) reduction by biogenic magnetite and vivianite

Microstructure and magnetism of nanoparticles withγ-Fecore surrounded byα-Feand iron oxide shells

Gravity-driven transport of three engineered nanomaterials in unsaturated soils and their effects on soil pH and nutrient release

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