Characterization of iron–organic matter nano-aggregate networks through a combination of SAXS/SANS and XAS analyses: impact on As binding

Guénet, Hélène; Davranche, Mélanie; Vantelon, Delphine; Gigault, Julien; Prévost, Sylvain; Taché, Olivier; Jaksch, Sebastian; Pédrot, Mathieu; Dorcet, Vincent; Boutier, Antoine; Jestin, Jacques

doi:10.1039/c6en00589f

Cited by 45 publications

(76 citation statements)

References 56 publications

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“…This model of Fe oxy-hydroxide occlusion in OM is well illustrated in several studies (Du et al, 2018;Eusterhues et al, 2014;Kleber et al, 2015). The density of SROFe-OM aggregates (Eusterhues et al, 2008;Guenet et al, 2017;Mikutta, 2011;Mikutta et al, 2008) together with the size of the ferrihydrite crystallites and their crystallinity (Eusterhues et al, 2008;Mikutta, 2011;Mikutta et al, 2010;Schwertmann et al, 2005) has been shown to vary with the experimental conditions. In a limited number of studies, Fe-coprecipitates were reported to be formed by Fe-oligomers, without reaching the polymerization level of ferrihydrite (Angelico et al, 2014;Mikutta, 2011;Vilgé et al, 1999b).…”

Section: Introductionmentioning

confidence: 55%

“…This model of the structure of nanoCLICs differs from the models proposed in the literature. Previous models of coprecipitates included Fe only as ferrihydrite and monomeric Fe-OM (Eusterhues et al, 2014;Guenet et al, 2017;Kleber et al, 2015). In the model in Figure 6, other major elements potentially present in the soil solution are taken into account.…”

Section: Comparison With Previous Models and Limits Of The Modelmentioning

confidence: 99%

“…Thus, as a function of the Fe:C ratio (from 100 down to 0.01, Kleber et al (2015)), OM composition and pH, several Fe phases may coexist: (1) polymerized nano-oxy-hydroxides (dominant at high Fe:C ratios); (2) oligomeric clusters (dominant at intermediate Fe:C ratios); and (3) mononuclear complexes (dominant at low Fe:C ratios) (Chen et al, 2016;Mikutta, 2011). These co-existing phases led Guenet et al (2017) to propose a model of fractal organization of Fe-coprecipitates. Aside from the differences in the structure of Fecoprecipitates described in the studies cited above, all the authors acknowledge that the strong complexation between Fe and OM hinders the polymerization of Fe by occupying the crystal growth sites.…”

Section: Introductionmentioning

confidence: 99%

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Soil organo-mineral associations formed by co-precipitation of Fe, Si and Al in presence of organic ligands

Tamrat

Rose

Grauby

et al. 2019

Geochimica et Cosmochimica Acta

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Section: Introductionmentioning

confidence: 55%

Section: Comparison With Previous Models and Limits Of The Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Soil organo-mineral associations formed by co-precipitation of Fe, Si and Al in presence of organic ligands

Tamrat

Rose

Grauby

et al. 2019

Geochimica et Cosmochimica Acta

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“…Moreover, the precipitation of Fe in the presence of OM constrains the particle size and structural order of Fe (Schwertmann et al, 2005;Eusterhues et al, 2008;Cismasu et al, 2011;Pédrot et al, 2011). These results in wider lattice spacing, fewer crystal planes and Fe monomers, polymers and nanoparticles bound to OM (Vilgé-Ritter et al, 1999;Guénet et al, 2017). Threlfall (2003) showed that clusters and nanoparticles grow through a continuous supply of Fe(III) and Waychunas et al, (2005) demonstrated that this occurs through particle and cluster aggregation as observed in Figure 5.…”

Section: Accepted Manuscriptmentioning

confidence: 96%

“…following the procedure described in Guénet et al (2017). All references were measured in the same conditions as the samples.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Iron speciation at the riverbank surface in wetland and potential impact on the mobility of trace metals

Ratié

Vantelon

Lotfi-Kalahroodi

et al. 2019

Science of The Total Environment

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Fe oxyhydroxides in riverbanks and their high binding capacity can be used to hypothesize that riverbanks may act as a "biogeochemical filter" between wetlands and rivers and may constitute a major mechanism in the trapping and flux regulation of chemical elements. Until now, the properties of Fe minerals have been very poorly described in riverbanks. The goals of the present work are to identify Fe speciation in riverbanks where ferric deposits are observed and to determine their impact on the metal behavior (As, Co, Cu, Ni, Pb, Zn, etc.). At the surface, Fe speciation is mainly composed of small poorly crystalline Fe phases, i.e. ferrihydrite (~30%), Fe-OM associations (~40%) as well as crystalline Fe phases, i.e. goethite (~35%). At the subsurface, the Fe distribution is dominated by goethite (~35%) and Fe-mica (~35%), the proportion of which increases at the expense of ferrihydrite and the Fe-OM associations. At the riverbank surface, ferrihydrite and the Fe-OM associations are therefore the main Fe hosting phases in response to (i) the fast Fe(II) oxidation induced by the presence of O and (ii) the high amount of OM favoring the formation of nano-phases bound to OM (Fe monomers, polymers and nanoparticles) and preventing mineralogical transformation (ferrihydrite into goethite). During the high-water level period (high flow), a strong erosion of the riverbank transfers these ferric deposits into the river. However, the physicochemical parameters of the river (pH 6.6-7.6 and continuous oxic conditions) do not promote the dissolution of Fe oxyhydroxides and OM. Ferric deposits and the associated trace metals are therefore maintained as colloids/particles and are exported to the outlet. All of the results presented here demonstrate that the ferric deposits trap metals on a seasonal basis and are therefore a key factor in the mobilization of metals during riverbank erosion by river flow.

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Biological matter enhanced iron release from shallow marine bioturbated sediments: a case study of Late Cretaceous sandstone, northern Saudi Arabia

Zhang,

Li,

Qin

et al. 2023

Int J Earth Sci (Geol Rundsch)

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Characterization of iron–organic matter nano-aggregate networks through a combination of SAXS/SANS and XAS analyses: impact on As binding

Abstract: The present work highlights the fractal organization of iron nanoparticles associated with organic matter and the impact of the aggregate structure on arsenic adsorption.

Cited by 45 publications

References 56 publications

Soil organo-mineral associations formed by co-precipitation of Fe, Si and Al in presence of organic ligands

Soil organo-mineral associations formed by co-precipitation of Fe, Si and Al in presence of organic ligands

Iron speciation at the riverbank surface in wetland and potential impact on the mobility of trace metals

Biological matter enhanced iron release from shallow marine bioturbated sediments: a case study of Late Cretaceous sandstone, northern Saudi Arabia

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