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Nb-substitution and Cs+ ion-exchange in the titanosilicate sitinakite
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UNSPECIFIED (2002) Nb-substitution and Cs+ ion-exchange in the titanosilicate sitinakite. MICROPOROUS AND MESOPOROUS MATERIALS, 55 (1). pp. 1-13. ISSN 1387-1811.
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Abstract
Cesium-133 MAS NMR and X-ray powder diffraction have been used to investigate Cs+ ion-exchange in synthetic samples of the titanosilicate mineral, sitinakite. The effect of incorporating Nb using Nb(V) ethoxide as the Nb source into the sitinakite framework and its influence on Cs+ ion-exchange was also studied. Refinements of X-ray powder data show that substitution of niobium for titanium in the sitinakite framework occurs to a limited extent using the synthetic method employed. Niobium substitution is also supported by Si-29 MAS NMR spectra. Any niobium that was not substituted into the sitinakite structure was present in a distinct Nb-rich oxide/hydroxide phase. NMR studies reveal that in the undoped samples with low Cs loadings, at least four types of Cs+ are present, while at higher levels of Cs+ loadings, an additional two sites are populated. Similar sites appear to be occupied in the Nb-substituted samples but the relative occupancies are strongly modulated relative to the undoped samples. The multiple Cs environments are attributed to Cs+ ions occupying similar structural sites in the titanosilicate channels but experiencing different hydration water coordination environments. (C) 2002 Elsevier Science Inc. All rights reserved.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QD Chemistry T Technology T Technology > TA Engineering (General). Civil engineering (General) |
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| Journal or Publication Title: | MICROPOROUS AND MESOPOROUS MATERIALS | ||||
| Publisher: | ELSEVIER SCIENCE BV | ||||
| ISSN: | 1387-1811 | ||||
| Official Date: | August 2002 | ||||
| Dates: |
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| Volume: | 55 | ||||
| Number: | 1 | ||||
| Number of Pages: | 13 | ||||
| Page Range: | pp. 1-13 | ||||
| Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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