Effect of adsorbed and substituted Al on Fe(II)-induced mineralization pathways of ferrihydrite

Hansel, Colleen M.; Learman, Deric R.; Lentini, C.J.; Ekstrom, Eileen B.

doi:10.1016/j.gca.2011.05.033

Cited by 116 publications

(83 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Cr-goethite was recrystallized through induction by Fe(II)aq, while the recrystallized products had a crystalline phase similar to that of the initial mineral. The rate of Fe atom exchange between the Fe(II) aq and Fe(III) oxide of iron (hydr)oxides were reported to be affected by various structural properties, for example, structural defects, particle sizes, and solid electron conductivity [6,30,32,37,38]. Notini et al [28] reported that surface defects of the goethite played an important role in Fe(II)-goethite redox interactions, and that the oxidation of Fe(II) aq by goethite was kinetically inhibited on structurally perfect surfaces.…”

Section: Influence Of Cr-substitution On Fe Atom Exchange and Electromentioning

confidence: 99%

<strong>Cr release from Cr-substituted goethite during the aqueous Fe(II)-induced recrystallization</strong>

Liu

Hua

Chen³

et al. 2018

Proceedings of the 1st International Electronic Conference on Mineral Science

View full text Add to dashboard Cite

Abstract:The interaction between aqueous Fe(II) (Fe(II) aq ) and iron minerals is an important reaction of the iron cycle, and it plays a critical role in impacting the environmental behavior of heavy metals in soils. Metal substitution into iron (hydr)oxides has been reported to reduce Fe atom exchange rates between Fe(II) aq and metal-substituted iron (hydr)oxides and inhibit the recrystallization of iron (hydr)oxides. However, the environmental behaviors of the substituted metal during these processes remain unclear. In this study, Fe(II) aq -induced recrystallization of Cr-substituted goethite (Cr-goethite) was investigated, along with the sequential release behavior of substituted Cr(III). Results from a stable Fe isotopic tracer and Mössbauer characterization studies show that Fe atom exchange occurred between Fe(II) aq and structural Fe(III) (Fe(III) oxide ) in Cr-goethites, during which the Cr-goethites were recrystallized. The Cr substitution inhibited the rates of Fe atom exchange and Cr-goethite recrystallization. During the recrystallization of Cr-goethites induced by Fe(II) aq , Cr(III) was released from Cr-goethite. In addition, Cr-goethites with a higher level of Cr-substituted content released more Cr(III). The highest Fe atom exchange rate and the highest amount of released Cr(III) were observed at a pH of 7.5. Under reaction conditions involving a lower pH of 5.5 or a higher pH of 8.5, there were substantially lower rates of Fe atom exchange and Cr(III) release. This trend of Cr(III) release was similar with changes in Fe atom exchange, suggesting that Cr(III) release is driven by Fe atom exchange. The release and reincorporation of Cr(III) occurred simultaneously during the Fe(II) aq -induced recrystallization of Cr-goethites, especially during the late stage of the observed reactions. Our findings emphasize an important role for Fe(II) aq -induced recrystallization of iron minerals in changing soil metal characteristics, which is critical for the evaluation of soil metal activities, especially those in Fe-rich soils.

show abstract

Section: Influence Of Cr-substitution On Fe Atom Exchange and Electromentioning

confidence: 99%

<strong>Cr release from Cr-substituted goethite during the aqueous Fe(II)-induced recrystallization</strong>

Liu

Hua

Chen³

et al. 2018

Proceedings of the 1st International Electronic Conference on Mineral Science

View full text Add to dashboard Cite

show abstract

“…Moreover, the experiments above on trace metal mobilization by aqueous Fe(II) were performed on pure iron-oxide phases. It has subsequently been shown that the inclusion of insoluble elements (e.g., Al, Cr and Sn) within the Fe oxide lattice can impede Fe(II) induced phase changes (e.g., Al, Hansel et al, 2011) and significantly reduce the release of Ni and Zn by inhibiting Fe atom exchange with Fe(II) . Given these considerations, this is a scenario likely to be more relevant for naturally occurring Fe oxide phases comprising IF.…”

Section: Considerations On the Diagenetic Mobility Of Zn And Ni And Imentioning

confidence: 99%

Limited Zn and Ni mobility during simulated iron formation diagenesis

et al. 2015

View full text Add to dashboard Cite

“…Arsenate stabilizes ferrihydrite too, but not to the same extent. Adsorption of cations, such as Al, also inhibits the transformation of ferrihydrite to crystalline iron oxides (Hansel et al 2011) and has probably very similar thermodynamic effect like phosphate or arsenate.…”

Section: Redox Potentials Of Fe and Mn Mineralsmentioning

confidence: 99%

Minerals and Aqueous Species of Iron and Manganese as Reactants and Products of Microbial Metal Respiration

Majzlan

2012

Microbial Metal Respiration

View full text Add to dashboard Cite

Minerals and aqueous species of redox-active elements are common participants in the processes of microbial metal respiration. Redox-active elements may be major or minor constituents of minerals and mineraloids. They are often adsorbed onto the surfaces on minerals that may or may not be involved in microbial metal respiration. They may be adsorbed onto or incorporated in solidlike organic matter; harvested by and contained in living cells; associated with aqueous colloidal matter, organic or inorganic; dissolved and complexed with humic substances; dissolved in the aqueous phase, possibly complexed with inorganic anions. Given their sheer abundance, iron and manganese are the most important elements from this point of view. Mineralogy of Fe is controlled by the two common oxidation states, +2 and +3. The three commonly available oxidation states of Mn (+2, +3, +4) make the mineralogy of this transition metal even more variable. Besides the chemical and crystallographic aspects of minerals of Fe and Mn, this chapter also briefly refers to the mounting evidence that essentially all near-surface minerals of Fe and Mn are involved in microbial metal respiration. In addition to the minerals of Fe and Mn, minerals with layered structure are discussed. These embrace clay minerals and layered double hydroxides; the latter group includes the ephemeral but important green rusts. Redox potentials for many of the minerals of Fe and Mn are calculated and the dependence of redox potentials on the particle size of iron oxides is quantitatively evaluated.

show abstract

Effect of adsorbed and substituted Al on Fe(II)-induced mineralization pathways of ferrihydrite

Cited by 116 publications

References 56 publications

<strong>Cr release from Cr-substituted goethite during the aqueous Fe(II)-induced recrystallization</strong>

<strong>Cr release from Cr-substituted goethite during the aqueous Fe(II)-induced recrystallization</strong>

Limited Zn and Ni mobility during simulated iron formation diagenesis

Minerals and Aqueous Species of Iron and Manganese as Reactants and Products of Microbial Metal Respiration

Contact Info

Product

Resources

About