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近年来,超临界CO_2体系中萃取锕系、镧系元素研究已经取得许多进展,在核废物处理方面呈现较好的应用前景。然而对于锕系和镧系在超临界CO_2中的分离行为仍有待研究。本项目研究了硝酸铀酰和硝酸钕固体与络合剂TBP的络合行为,采用紫外可见光谱法在线监测了络合物在超临界CO_2中的浓度。研究发现,随着TBP量的增加,TBP-U(Ⅵ)络合物的浓度比TBP-Nd(Ⅲ)先达到平衡(两种络合物的结构示于图1)。当升高
In recent years, the research on extraction of actinides and lanthanides in supercritical CO_2 system has made a lot of progress, and has shown a good application prospect in nuclear waste treatment. However, the behavior of actinides and lanthanides in the supercritical CO 2 separation remains to be studied. In this project, the complexation behavior of uranyl nitrate and neodymium nitrate with complexing agent TBP was investigated. The concentration of complex in supercritical CO 2 was monitored online by UV-visible spectroscopy. It was found that the concentration of TBP-U (VI) complex equilibrated with TBP-Nd (III) as the amount of TBP increased (the structures of the two complexes are shown in Figure 1). When rising