Anomalous small angle x-ray scattering study of layered silicate clays containing Ni(II) and Er(III)
- Intense Pulsed Neutron Source Division and Chemistry Division, Argonne National Laboratory, Argonne, IL 60439 (United States)
These studies concern the synthesis of heterogeneous catalysts and the incorporation of heavy metals in trapping media. The Ni(II) containing clays were synthesized at 200{degree}C whereas those containing Er(III) were ion-exchanged natural clays. For the first system, ASAXS data were measured at 5 different energies near the {ital K}{alpha} edge of Ni at three different reaction times: unreacted, 4 hrs, and 15 hrs when the crystallization is essentially complete. The data for the unreacted sample showed no correlations for a lamellar particle, while that reacted for 4 hrs indicated the evolution of lamella, and the crystallized sample (15 hrs) exhibited much larger lamellar correlations. Systematic variations are seen in the data for the 4 hr and 15 hr samples that are due to the anomalous scattering from the ordered Ni atoms in the layered silicates. The erbium study provides the first scattering measurements of heavy metal ion solvation and migration in clays, which has implications for both catalysis and environmental issues. Systematic energy-dependent variations in the signals near the L{sub III}edge of Er are observed for the hydrated sample but not for the {open_quote}{open_quote}dry{close_quote}{close_quote} as-prepared sample. {copyright} {ital 1996 American Institute of Physics.}
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 389576
- Report Number(s):
- CONF-9510119--
- Journal Information:
- Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 9 Vol. 67; ISSN 0034-6748; ISSN RSINAK
- Country of Publication:
- United States
- Language:
- English
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