Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Dalton Trans. 2013 Jun 21;42(23):8413-9. doi: 10.1039/c3dt32832e. Epub 2013 Apr 25.
Imidazolium-based Fe-containing ionic liquids (ILs) can directly dissolve UO2 in the presence of their corresponding imidazolium chlorides without additional oxidants. The dissolution process follows pseudo first-order kinetics initially. Raman spectroscopic studies indicate that FeCl4(2-) is the predominant reduction product after UO2 dissolution, and attenuated total reflection-Fourier transform infrared spectroscopy indicates that the UO2(2+) complex is the principal product in the ILs. The dissolved uranyl species can be successfully separated from the Fe-containing ILs via a combination of centrifugation and solvent extraction, and also, the Fe-containing ILs can be recovered easily. In conclusion, imidazolium-based Fe-containing ionic liquids in the presence of imidazolium chlorides could be used as effective and recoverable oxidants for the dissolution of UO2.
基于咪唑的含 Fe 离子液体（ILs）在相应的咪唑氯化物存在下可以直接溶解 UO2，而无需额外的氧化剂。溶解过程最初遵循准一级动力学。拉曼光谱研究表明，UO2 溶解后，FeCl4(2-) 是主要的还原产物，衰减全反射-傅里叶变换红外光谱表明 UO2(2+) 配合物是 ILs 中的主要产物。溶解的铀酰物种可以通过离心和溶剂萃取的组合从含 Fe 的 ILs 中成功分离，并且含 Fe 的 ILs 也可以很容易地回收。总之，在咪唑氯化物存在下的基于咪唑的含 Fe 离子液体可以用作 UO2 溶解的有效和可回收的氧化剂。
