DEVELOPMENT OF PROTOTYPE TITANATE ION EXCHANGE LOADED MEMBRANES FOR STRONTIUM, CESIUM AND ACTINIDE DECONTAMINATION FROM AQUEOUS MEDIA Page: 3 of 19
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We have successfully incorporated high surface area particles of titanate ion exchange
materials (monosodium titanate and crystalline silicotitanate) with acceptable particle size
distribution into porous and inert support membrane fibrils consisting of
polytetrafluoroethylene (Teflon*), polyethylene and cellulose materials. The resulting
membrane sheets, under laboratory conditions, were used to evaluate the removal of
surrogate radioactive materials for cesium-137 and strontium-90 from high caustic
nuclear waste simulants. These membrane supports met the nominal requirement for non-
chemical interaction with the embedded ion exchange materials and were porous enough
to allow sufficient liquid flow. Some of this 47-mm size stamped out prototype titanium
impregnated ion exchange membrane discs was found to remove more than 96% of
dissolved cesium-133 and strontium-88 from a caustic nuclear waste salt simulants. Since
in traditional ion exchange based column technology monosodium titanate (MST) is
known to have great affinity for the sorbing of other actinides like plutonium, neptunium
and even uranium, we expect that the MST-based membranes developed here, although
not directly evaluated for uptake of these three actinides because of costs associated with
working with actinides which do not have "true" experimental surrogates, would also
show significant affinity for these actinides in aqueous media.
It was also observed that crystalline silicotitanate impregnated polytetrafluoroethylene or
polyethylene membranes became less selective and sorbed both cesium and strontium
from the caustic aqueous salt simulants.
Keywords: Monosodium titanate, crystalline silicotitanate, ion exchange membranes.
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Oji, L; Keisha Martin, K & David Hobbs, D. DEVELOPMENT OF PROTOTYPE TITANATE ION EXCHANGE LOADED MEMBRANES FOR STRONTIUM, CESIUM AND ACTINIDE DECONTAMINATION FROM AQUEOUS MEDIA, article, May 30, 2008; [Aiken, South Carolina]. (digital.library.unt.edu/ark:/67531/metadc894905/m1/3/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.