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- Title
Solvent extraction of uranium(VI) by a dipicolinamide using a room-temperature ionic liquid.
- Authors
Sun, Man; Yuan, Li-Yong; Tan, Ni; Zhao, Yu-Liang; Chai, Zhi-Fang; Shi, Wei-Qun
- Abstract
Room-temperature ionic liquids (RTILs) have recently received increasing attention as solvent alternatives for possible application in spent fuel reprocessing, particularly in the extraction of metal ions from high-level radioactive aqueous waste, due to their unique physical and chemical properties. Herein, the solvent extraction of the uranyl ions (UO22+) was performed using N, N′-diethyl- N, N′-di(para)tolyl-dipicolinamide (Et(p)TDPA) as the extractant in a commonly used ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([C4mim][PF6]). The effects of vortexing time, phase ratio and the concentration dependence of Et(p)TDPA, nitric acid and sodium nitrate on the extraction were studied in detail. The extraction mechanism was deduced based on the slope analysis and UV-vis measurement. The distribution ratio of U from 3 mol/L nitric acid by 0.3 mol/L EtTDPA/C4mimPF6 is found to be almost 100. Conventional log-log plot analysis of the extraction equilibrium data suggests that the ions are extracted as a complex in 2:3 ratio of UO22+ to extractant, and the extraction most likely occurs by a cation-exchange mode since the concentration of C4mim+ in the aqueous phase increases linearly with the percent extraction of UO22+ evidenced by UV-vis measurement. This work promises to provide new efficient media based on RTILs for separation of uranium from the radioactive aqueous waste.
- Subjects
EXTRACTION (Chemistry); URANIUM; IONIC liquids; SALTS; CHEMICAL properties; RADIOCHEMISTRY
- Publication
Radiochimica Acta, 2014, Vol 102, Issue 1/2, p87
- ISSN
0033-8230
- Publication type
Article
- DOI
10.1515/ract-2014-2095