As the primary fission product in spent nuclear fuel being generally filed into the high-level liquid waste, the 90 Sr recovered from the reprocessed nuclear fuel could be a significant source for producing 90 Y nuclide (the decay daughter). It presents as one favorable therapeutic radionuclide candidate for radiolabeling of pharmaceuticals in widespread clinical application. Under this situation, a novel silica-based adsorbent (HDEHP/SiO 2 -P) was developed for selective separation of Y 3+ from concentrated Sr 2+ in aqueous solution. Batch adsorption process was investigated under different parameters of acid type and strength, contact time, temperature, ionic concentration and molar ratio etc. It was confirmed that, the HDEHP/SiO 2 -P had highly selective properties toward Y 3+ over Sr 2+ in different acidic medium (i.e., hydrochloric, nitric and acetic acid), with maximum adsorption capacity 34.05 mg Y 3+ /g. Sorption isotherms and uptake kinetics, were better fitting for Langmuir monomolecular layer adsorption mode and the pseudo-second order (PSORE) kinetic model respectively. The sorbent shows high SF Y/Sr of 1.93 × 10 3 even at a Sr-Y molar ratio of 2 × 10 3 . Moreover, dynamic separation of trace amount of Y 3+ from the concentrated Sr 2+ aqueous solution was successfully validated by the column test, in which 100 % Y 3+ was recovered. The produced eluate is characterized by a sharp elution curve without Sr trailing under high acidic conditions of 6 M HCl. All these results would promisingly promote the application of the developed material and chromatographic approach to facilely obtain the adequate quantities of 90 Y with required radiochemical purity for its widespread clinical use.
Kaibo Hu,Wenyi Zhang,Yucheng Liu,Qian Xu,Tianci Chen,Jiuyang Lin,Xuewei Li,Yinhua Wan
Yttrium (Y) separation from Y-rich heavy rare earth groups is a complex challenge due to their similar physical and chemical properties. Conventional industrial separation processes require the use of complex and polluting techniques, thus highlighting the need for cleaner and more efficient methods for Y separation. In this study, a new method for separating Y from Y-rich heavy rare earth groups was developed using the hollow fiber renewal support liquid membrane (HFRLM) with an amine-group-functionalized ionic liquid ([N1888][CA12]) system, which eliminates the need for acids and bases during the extraction and stripping process. The high extraction efficiency and strong hydrophobicity of [N1888][CA12] enhances the stability and efficacy of the HFRLM . The optimal hydrodynamic conditions were achieved using a stripping solution of water, phase volume ratio of 4.8, NaCl concentration of 0.6 mol/L, [N1888][CA12]concentration of 0.4 mol/L, and flow rate of 350 mL/min. Moreover, a deionized water regeneration [N1888][CA12]-HFRLM method was established, and the system remained highly stable after five regenerations. Furthermore, the [N1888][CA12]-HFRLM system was evaluated for separating Y from Y-rich heavy rare earth groups, and it was found that the molar ratio of Y increased from 70.9% to over 98.4%.
危险品化学品经营许可证（带存储）