Adsorption and Separation of Sr(II) and Y(III) by Extraction Chromatography Using HDEHP-impregnated Adsorbent

Abstract

To separate Y (III) and Sr(II) from a Sr(II)-Y(III) mixed solution, a silica-based (HDEHP+Oct)/SiO 2 -P adsorbent was prepared by successive impregnation and fixing the bis(2-ethylhexyl)phosphate (HDEHP) and its molecule modifier 1 - octanol into the macroporous SiO 2 -P support with a mean diameter of 50 μ m. The adsorption and separation of Y(III) and Sr(II) from HNO 3 or HCl solutions onto the adsorbent were investigated by batch and column methods. The adsorbent showed a higher adsorption affinity to Y(III) than Sr(II). The adsorption of Y(III) decreased as the acidity of the solution increased. The adsorption of Y(III) could be expressed by the Langmuir adsorption model and was governed by chemisorption. In column experiments, using a column packed with (HDEHP+Oct)/SiO 2 -P adsorbent, Sr(II) and Y(III) were eluted by HNO 3 or HCl solution, respectively. The separation of Y(III) from Sr(II)-Y(III) mixed solution was achieved successfully. packed column, Sr(II) and Y(III) were eluted by HNO 3 or HCl solution, respectively. A successful separation of Y(III) from Sr(II)-Y(III) mixed solution was achieved.