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- Author or Editor: Y. Onodera x
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Abstract
A study of fixation of caesium on crystalline titania by co-precipitation was carried out. A maximum loading of ∼46wt% of caesium was found to be incorporated in the titania matrix. High leach-resistivity of Cs cations was observed to be in the order of 10−6–10−8 g.m−2.d−1 by Soxhlet flow refluxing at 97 °C of the composite material calcined at 800, 1000 °C for 48 hours. The analysis of X-ray powder diffractions of the composite materials revealed that cesium was fixed in the crystal lattice of host titania with the formation of new mineral phases of CsTi4O9 and Cs2Ti5O11. The results, taken together, implicate that a better fixation of caesium on titania can be achieved by calcination at 1000 °C for 48 hours.
Abstract
Microcapsules enclosing an extractant with strong affinity for Am were prepared by employing a biopolymer gel as an immobilization matrix. A relatively large separation factor between Am and Eu was exhibited by the microcapsule containing of bis(2,4,4-trimethylpentyl)dithiophosphinic acid (Cyanex 301, HA) and alginic acid (HALG). The chromatographic separation of these metal ions was accomplished by gradient elution through the column packed with HA-HALG.
Abstract
The uptake behavior of Am3+ was investigated by using alginic acid and alginate polymer gels. The affinity of radioactive nuclides for carboxyl groups in gel matrices increased in the order of Na+ < Cs+ < Co2+ < Pd2+, Sr2+, Fe3+ < Eu3+, Am3+. Among alginate gels, calcium alginate exhibited relatively higher uptake rate and distribution coefficient of Am3+. The column packed with calcium alginate beads was effective for the removal of trace amounts of Am3+ from acidic nitrate solutions.
