Adsorption and separation behavior of yttrium and strontium in nitric acid solution by extraction chromatography using a macroporous silica-based adsorbent

摘要

To separate ~(90)Y from the fission product ~(90)Sr- ~(90)Y group, a silica-based TODGA/SiO _2-P adsorbent was prepared by impregnating N,N,N',N'-tetraoctyl-3-oxapentane-1,5-diamide (TODGA) extractant into the macroporous SiO _2-P support with a mean diameter of 60μm. The adsorption behavior of Sr(II) and Y(III) onto TODGA/SiO _2-P adsorbent from HNO _3 solution and their mutual separation were investigated. Under the experimental conditions, this adsorbent showed high adsorption affinity to Y(III) and weak adsorption to Sr(II). It was found that the adsorption process of Y(III) could be expressed by both of Langmuir monomolecular layer adsorption mode and the pseudo-second order model. From the results of stability experiments, it became clear that TODGA/SiO _2-P adsorbent is stable in 3M HNO _3 solution for 1 month contact time at 298K. Using a column packed with TODGA/SiO _2-P adsorbent, Sr(II) and Y(III) were eluted by distilled water and diethylenetriamine pentaacetic acid (DTPA) solution, respectively. The separation of Y(III) from Sr(II)-Y(III) group was achieved successfully.