Tungstate ion-alumina interaction in a {sup 188}W {yields} {sup 188}Re biomedical generator
- Lucas Heights Research Lab., Menai (Australia)
- Oak Ridge National Lab., TN (United States)
The surface interaction between WO{sub 4}{sup 2} ions and the alumina support in the {sup 188}W {yields} {sup 188}Re/Al{sub 2}O{sub 3} biomedical generator system was examined by the dynamic adsorption method employing the {sup 187}W tracer and by FT-IR, Raman, {sup 27}Al MAS NMR, and XPS spectroscopic methods. These studies demonstrated the complex physical and chemical nature of WO{sub 4}{sup 2-} ion adsorption on alumina. The dynamic adsorption studies indicated that the adsorption process includes several stages from initial monolayer formation to almost complete saturation of the alumina surface. FTIR, Raman, and {sup 27}Al MAS NMR data showed that adsorption of WO{sub 4}{sup 2-} on the Al{sub 2}O{sub 3} surface in slightly acidic solutions proceeds via formation of thermodynamically stable complexes of tetrahedrally coordinated aluminum atoms and WO{sub 4}{sup 2-} tetrahedrons. Previously, these complexes were shown to form, and were identified, only under calcination conditions. Our conclusion on the nature of WO{sub 4}{sup 2-}-Al{sub 2}O{sub 3} complex in aqueous solutions was further supported by the results from XPS studies where it was shown that W-containing species are strongly attached to the surface of alumina via W-O bonds. 20 refs., 6 figs., 4 tabs.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 81328
- Journal Information:
- Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 27 Vol. 99; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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