Fe-containing ionic liquids as effective and recoverable oxidants for dissolution of UO2 in the presence of imidazolium chlorides.
Fe-containing ionic liquids as effective and recoverable oxidants for dissolution of UO2 in the presence of imidazolium chlorides.
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DOI：
10.1039/c3dt32832e
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发表时间：
2013-05
影响因子：
4
通讯作者：
Aining Yao;Taiwei Chu
中科院分区：
文献类型：
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作者：
Aining Yao;Taiwei Chu
咪唑类含铁离子液体（Imidazolium-based Fe ionic liquids，ILs）可以在相应的咪唑氯化物存在下直接溶解UO 2。溶解过程遵循伪一级动力学。拉曼光谱研究表明，FeCl 4（2-）是UO 2溶解后的主要还原产物，衰减全反射-傅里叶变换红外光谱研究表明，离子液体中的主要产物是UO 2（2+）络合物。通过离心和溶剂萃取相结合的方法，可以成功地将溶解的铀酰物质从含铁离子液体中分离出来，而且含铁离子液体可以很容易地回收。因此，咪唑类铁离子液体在咪唑类氯化物存在下，可以作为有效的、可回收的氧化剂溶解UO 2。
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.