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Immobilization of yttrium over crystalline titania

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Abstract

A co-precipitation method was adopted for the immobilization of yttrium radioactive waste over crystalline titania. A high uptake of91Y was observed over the preformed hydrous titania. Weighable quantity of Y was coprecipitated with Ti(IV) hydroxide and a maximum of ∼38 wt% was found to be adsorbed. Mixed masses were calcined separately at 800 and 1000°C for 20 hours, and soxhlet leach tests at 97°C, repeated 7 times at an interval of 24 hours, showed the release of yttrium in the order of 10−1 and 10−2 g·m−2·d−1, respectively. X-ray powder diffraction analysis revealed that the yttrium was immobilized in the titania crystal lattice which suffered some structural changes with the formation of new mineral phase Y2Ti2O7 which is accompanied by rutile and little quantity of anatase form of titania at 800°C, and only rutile form of titania at 1000°C.

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  1. Nuclear Chemistry Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, 700 064, Calcutta, (India)

    N. C. Dutta & D. K. Bhattacharyya

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  1. N. C. Dutta
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  2. D. K. Bhattacharyya
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Dutta, N.C., Bhattacharyya, D.K. Immobilization of yttrium over crystalline titania. Journal of Radioanalytical and Nuclear Chemistry, Articles 204, 167–172 (1996). https://doi.org/10.1007/BF02060877

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