Sorption Kineitics Of Uranium

Category: Ukrainean-polish sympozium

SORPTION KINEITICS OF URANIUM

BY TITAN-CONTAINING SORBENTS

V. V. Strelko, T. S. Psareva, O. I. Zakutevsky

Institute for sorption and problems of Endoecology of National Academy of Sciences, 13 General Naumov street, 03680 Kyiv-164, Ukraine

The object of study was the sorption of uranium by the titan-containing sorbents of the following composition: Ti-P, Ti-Si-P and Ti-Si. An optimal proportion of components that provide for the most complete extraction of the uranium from the water solution was determined in the course of the series of experiments.

It was found out and demonstrated that the sorption of uranium by the titan-containing sorbents depends on pH value (or is pH-sensitive); its optimal value is 5-5,5, and thus coinsides with the formation of hydrolized forms of uranil, with its concentration in the initial (parent) solution about 10-4 –10-5M [1]. Particle size and pore parameters have a considerable impact on the sorption kinetics. It has been estimated that the rate of ion-exchange process depends on concentration of uranil-ion in the solution, but is independent of the intensivity of stirring.

The rate of the process is increasing after a kinetic experiment had been interrupted for some time. Thus, we could speak of a combined kinetic mechanism of the process of uranium sorption by titan-containing sorbents.

In the initial stage of the process its rate is determined by external diffusion of the sorbate particles to sorbent surface. Durind the next step after filling up of the surface an internal diffusion becomes a limiting stage, i.e. diffusion of uranium into a particle.

For the quantitive treatment a kinetic model proposed by the authors [1] was used; this model considered a two-phased (staged) kinetic mechanism, thus enabling to determine coefficients of external and internal diffusion.

References

1. P.Michard, E.Guibal, T.Vincent, P.LeCloires Microporous Materials,1966, 5 , p.p. 309-324.

2. P.Michard, E.Guibal, T.Vincent, P.LeCloirec, Microporous Materials, 1996, 5, p.p.309-324



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