Adsorption of antimony onto iron oxyhydroxides: Adsorption behavior and surface structure

- Antimony adsorption depended on the Sb species, pH, and the type of iron oxides.
- Sb(V) adsorption favored at acidic pH, Sb(III) adsorption optimized in wider pH.
- Antimony was adsorbed onto the iron oxides by the inner-sphere surface complex.
- Bidentate mononuclear (2E) was the dominant form of Sb incorporated into HFO.
- XAFS and XPS indicated Sb(III) adsorbed was slowly oxidized to Sb(V).