In-situ Grazing-Incidence EXAFS Study of Pb(II) Chemisorption on Hematite (0001) and (1-102) Surfaces (titled changed by journal: IN SITU GRAZING INCIDENCE EXTENDED X-RAY ABSORPTION FINE STRUCTURE STUDY OF PB(II) CHEMISORPTION ON HEMATITE (0001) AND (1-102) SURFACES)
- SLAC
The dominant mode of binding of aqueous Pb(II) to single crystal (0001) (C-cut) and (1-102) (R-cut) surfaces of {alpha}-Fe{sub 2}O{sub 3} 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 {alpha}-Al{sub 2}O{sub 3} (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 {alpha}-Fe{sub 2}O{sub 3} and {alpha}-Al{sub 2}O{sub 3} C-cut surfaces in contact with bulk water, which found major structural differences between the surfaces of these two metal oxides.
- Research Organization:
- Stanford Linear Accelerator Center, Menlo Park, CA (US)
- Sponsoring Organization:
- USDOE Office of Science (US)
- DOE Contract Number:
- AC03-76SF00515;
- OSTI ID:
- 826809
- Report Number(s):
- SLAC-PUB-10385
- Country of Publication:
- United States
- Language:
- English
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