In Situ Grazing-Incidence Extended X-ray Absorption Fine Structure Study of Pb(II) Chemisorption on Hematite (0001) and (1-102) Surfaces
The dominant mode of binding of aqueous Pb(II) to single crystal (0001) (C-cut) and (1-102) (R-cut) surfaces of a-Fe2O3 has been determined using grazing-incidence x-ray absorption fine structure (GI-XAFS) spectroscopy. Oligomeric Pb(II) complexes were found to bind in inner-sphere modes on both surfaces, which is in contrast with the binding of aqueous Pb(II) on a-Al2O3 (0001) surfaces, where Pb(II) was found in past GI-XAFS studies to bind in a dominantly outer-sphere mode, indicating a significant difference in reactivity of these two surfaces to Pb(II). This difference in reactivity to Pb(II) is explained on the basis of recent crystal truncation rod diffraction studies of the a-Fe2O3 and a-Al2O3 C-cut surfaces in contact with bulk water, which found major structural differences between the surfaces of these two metal oxides.
- Research Organization:
- Pacific Northwest National Lab., Richland, WA (US), Environmental Molecular Sciences Laboratory (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 15007114
- Report Number(s):
- PNNL-SA-40145; 2594; KP1301030
- Journal Information:
- Langmuir, Journal Name: Langmuir Journal Issue: 5 Vol. 20; ISSN LANGD5; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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