Direct Visualization of Arsenic Binding on Green Rust Sulfate

• Published in: Environmental science & technology Vol. 54; no. 6; pp. 3297 - 3305
• Main Authors: H. Perez, Jeffrey Paulo, Freeman, Helen M, Brown, Andy P, van Genuchten, Case M, Dideriksen, Knud, S’ari, Mark, Tobler, Dominique J, Benning, Liane G
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 17.03.2020
• Subjects: Absorption spectroscopy; Adsorption; Arsenates; Arsenic; Binding; Distribution functions; Energy dispersive X ray spectroscopy; Ferric Compounds; Fine structure; Green rust; Image resolution; Immobilization; Iron; Mapping; Morphology; pH effects; Phases; Scanning transmission electron microscopy; Spectrum analysis; Substrates; Sulfates; Surface chemistry; Transmission electron microscopy; Ultrastructure; X ray absorption; X-Ray Absorption Spectroscopy

“Green rust” (GR), a redox-active Fe­(II)–Fe­(III) layered double hydroxide, is a potential environmentally relevant mineral substrate for arsenic (As) sequestration in reduced, subsurface environments. GR phases have high As uptake capacities at circum-neutral pH conditions, but the exact interacti...