Interactions of ferrous iron with clay mineral surfaces during sorption and subsequent oxidation

Groeningen, Natacha Van; ThomasArrigo, Laurel K.; Byrne, James M.; Kappler, Andreas; Christl, Iso; Kretzschmar, Ruben

doi:10.1039/d0em00063a

Cited by 30 publications

(16 citation statements)

References 72 publications

(109 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, trace amounts of Fe sulfides do not appear to be the major sink of Fe(II), which is a consequence of reductive dissolution of the ample present Fe(III) oxides. This indicates that Fe(II) is most likely adsorbed/substituted back into clay minerals which can provide a large surface for Fe adsorption [57,58]. The relatively higher adsorption affinity for Fe(II) is probably due to slightly alkaline pH conditions in the aquifers, in such adsorption of Fe(II) to clay minerals is favored at pH above 6.0 [59].…”

Section: Speciation and Reactivity Of Fe-s-as Coupled Minerals In The Sediments Profilementioning

confidence: 99%

Vertical redox zones of Fe–S–As coupled mineralogy in the sediments of Hetao Basin – Constraints for groundwater As contamination

Wang

Göttlicher

Byrne

et al. 2021

Journal of Hazardous Materials

View full text Add to dashboard Cite

The formation of iron-sulfur-arsenic (Fe-S-As) minerals during biogeochemical processes in As contaminated aquifers remains poorly understood despite their importance to understanding As release and transport in such systems. In this study, X-ray absorption and Mössbauer spectroscopies complemented by electron microscopy, and chemical extractions were used to examine vertical changes of As, Fe and S speciation for the example of sediments in the Hetao Basin.Reduction of Fe(III), As(V) and SO4 2species were shown to co-occur in the aquifers. Iron oxides were observed to be predominantly goethite and hematite (36 -12%) and appeared to decrease in abundance with depth. Furthermore, reduced As (including arsenite and As sulfides) and sulfur species (including S(-II), S(-I) and S 0 ) increased from 16% to 76% and from 13% to 44%, respectively.Iron oxides were the major As carrier in the sediments, and the lower groundwater As concentration consists with less desorbable and reducible As in the sediments. The formation of As-Fe sulfides (e.g., As containing pyrite and greigite) induced by redox heterogeneities likely contribute to localized lower groundwater As concentrations. These results help to further elucidate the complex relationship between biogeochemical processes and minerals formation in As contaminated aquifers.

show abstract

Section: Speciation and Reactivity Of Fe-s-as Coupled Minerals In The Sediments Profilementioning

confidence: 99%

Vertical redox zones of Fe–S–As coupled mineralogy in the sediments of Hetao Basin – Constraints for groundwater As contamination

Wang

Göttlicher

Byrne

et al. 2021

Journal of Hazardous Materials

View full text Add to dashboard Cite

show abstract

“…The characteristic bands of 3697, and 3620 cm −1 correspond to the stretching vibration of the hydroxyl groups (OH) of Si and Al, respectively, in the clay minerals. Meanwhile, the absorption peaks at 1637 cm −1 can be attributed to the C=O stretching vibration of the carboxyl group (-COO) [ 7 , 8 ]. The Si-O-Si band is observed at 1032 cm −1 as a result of the Si-O vibration.…”

Section: Resultsmentioning

confidence: 99%

“…Among the particulates, the metal-bearing particles were the most influential in the contaminated soil. These contaminants, containing a diverse form of toxic heavy metals, are associated with particles not heated up to melting temperatures, metal fragments and Fe oxide particles [ 7 , 8 ]. A number of previous studies have reported that contaminant emissions into the atmosphere on a regional scale could be related to wind direction and the size of particulates emitted by the smelter [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Remediation of Toxic Heavy Metal Contaminated Soil by Combining a Washing Ejector Based on Hydrodynamic Cavitation and Soil Washing Process

Kim

Cho

Purev

et al. 2022

IJERPH

View full text Add to dashboard Cite

Based on the features of hydrodynamic cavitation, in this study, we developed a washing ejector that utilizes a high-pressure water jet. The cavitating flow was utilized to remove fine particles from contaminated soil. The volume of the contaminants and total metal concentration could be correlated to the fine-particle distribution in the contaminated soil. These particles can combine with a variety of pollutants. In this study, physical separation and soil washing as a two-step soil remediation strategy were performed to remediate contaminated soils from the smelter. A washing ejector was employed for physical separation, whereas phosphoric acid was used as the washing agent. The particles containing toxic heavy metals were composed of metal phase encapsulated in phyllosilicates, and metal phase weakly bound to phyllosilicate surfaces. The washing ejector involves the removal of fine particles bound to coarse particles and the dispersion of soil aggregates. From these results we determined that physical separation using a washing ejector was effective for the treatment of contaminated soil. Phosphoric acid (H3PO4) was effective in extracting arsenic from contaminated soil in which arsenic was associated with amorphous iron oxides. Thus, the obtained results can provide useful information and technical support for field soil washing for the remediation of soil contaminated by toxic heavy metals through emissions from the mining and ore processing industries.

show abstract

“…Some oxidation even proceeds under anoxic conditions, as catalyzed by the sorbate, e.g. NOM (Daugherty et al, 2017) or phyllosilicates (Van Groeningen et al, 2020), or by microorganisms (Bryce et al, 2018).…”

Section: Feox Precipitation and Morphology Are Governed By Heterogene...mentioning

confidence: 99%

Freshwater Suspended Particulate Matter – Key Components and Processes in Floc Formation and Dynamics.

Walch¹,

Kammer²,

Hofmann³

2022

Preprint

View full text Add to dashboard Cite

Freshwater suspended particulate matter (SPM) plays an important role in many biogeochemical cycles and serves multiple ecosystem functions. Most SPM is present as complex floc-like aggregate structures composed of various minerals and organic matter from the molecular to the organism level. Flocs provide habitat for microbes and feed for larger organisms. They constitute microbial bioreactors, with prominent roles in carbon and inorganic nutrient cycles, and transport nutrients as well as pollutants, affecting sediments, inundation zones, and the ocean. Composition, structure, size and concentration of SPM flocs are subject to high spatiotemporal variability. Floc formation processes and compositional or morphological dynamics can be established around three crucial components: phyllosilicates, iron oxides/(oxy)hydroxides (FeOx) and microbial extracellular polymeric substances (EPS). These components and their interactions increase heterogeneity in surface properties, enhancing flocculation. Phyllosilicates exhibit intrinsic heterogeneities in surface charge and hydrophobicity. They are preferential substrates for precipitation or attachment of reactive FeOx. FeOx form patchy coatings on minerals, especially phyllosilicates, which increase surface charge heterogeneities. Both, phyllosilicates and FeOx strongly adsorb natural organic matter (NOM), preferentially certain EPS. EPS comprise various substances with heterogeneous properties that make them a sticky mixture enhancing flocculation. Microbial metabolism, and thus EPS release, is supported by the high adsorption capacity and favorable nutrient composition of phyllosilicates and FeOx supply essential Fe.

show abstract

Interactions of ferrous iron with clay mineral surfaces during sorption and subsequent oxidation

Abstract: Under anoxic conditions, clay minerals sorb dissolved Fe(ii) predominantly by forming surface precipitates, which transform into Fe(iii)-phases upon aeration.

Cited by 30 publications

References 72 publications

Vertical redox zones of Fe–S–As coupled mineralogy in the sediments of Hetao Basin – Constraints for groundwater As contamination

Vertical redox zones of Fe–S–As coupled mineralogy in the sediments of Hetao Basin – Constraints for groundwater As contamination

Remediation of Toxic Heavy Metal Contaminated Soil by Combining a Washing Ejector Based on Hydrodynamic Cavitation and Soil Washing Process

Freshwater Suspended Particulate Matter – Key Components and Processes in Floc Formation and Dynamics.

Contact Info

Product

Resources

About