The structure of actinide ions exchanged into native and modified zeolites and clays
X-ray absorption spectroscopy (XAS) has been used to investigate the structure and valence of thorium (Th{sup 4+}) and uranyl (UO{sub 2}{sup 2+}) cations exchanged into two classes of microporous aluminosilicate minerals: zeolites and smectite clays. XAS is also employed to examine the fate of the exchanged cations after modification of the mineral surface using self-assembled organic films and/or exposure to hydrothermal conditions. These treatments serve as models for the forces that ultimately determine the chemical fate of the actinide cations in the environment. The speciation of the cations depends on the pore size of the aluminosilicate, which is fixed for the zeolites and variable for the smectites.
- Research Organization:
- Argonne National Laboratory, Argonne, IL (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 751840
- Report Number(s):
- ANL/CHM/CP-99588; TRN: US0003155
- Resource Relation:
- Conference: MRS '99 Fall Meeting, Boston, MA (US), 11/29/1999--12/03/1999; Other Information: PBD: 16 Feb 2000
- Country of Publication:
- United States
- Language:
- English
Similar Records
Speciation of uranium in surface-modified, hydrothermally treated, (UO{sub 2}){sup 2+}-exchanged smectite clays
An experimental and modeling investigation of UO{sub 2}{sup 2+} interaction with smectite clays