Nb-substitution and Cs+ ion-exchange in the titanosilicate sitinakite

V Luca; J V Hanna; M E Smith; M James; D R G Mitchell; John R Bartlett

doi:10.1016/S1387-1811(02)00353-0

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Nb-substitution and Cs+ ion-exchange in the titanosilicate sitinakite

Journal article

Peer reviewed

Nb-substitution and Cs+ ion-exchange in the titanosilicate sitinakite

V Luca, J V Hanna, M E Smith, M James, D R G Mitchell and John R Bartlett

Microporous and Mesoporous Materials, Vol.55(1), pp.1-13

2002

DOI: https://doi.org/10.1016/S1387-1811(02)00353-0

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Abstract

Chemical Sciences

Engineering

silicotitanate

titanosilicate

ion-exchange

cesium

NMR

XRD

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 29Si 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.

Details

Title: Nb-substitution and Cs+ ion-exchange in the titanosilicate sitinakite
Authors: V Luca (Author) - Australian Nuclear Science and Technology Organisation Materials Division
J V Hanna (Author) - Australian Nuclear Science and Technology Organisation Materials Division
M E Smith (Author) - University of Warwick, United Kingdom
M James (Author) - Australian Nuclear Science and Technology Organisation Physics Division
D R G Mitchell (Author) - Australian Nuclear Science and Technology Organisation Materials Division
John R Bartlett (Author) - Australian Nuclear Science and Technology Organisation Materials Division
Publication details: Microporous and Mesoporous Materials, Vol.55(1), pp.1-13
Publisher: Elsevier BV
Date published: 2002
DOI: 10.1016/S1387-1811(02)00353-0
ISSN: 1387-1811
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99448896702621
Output Type: Journal article

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