摘要
初步研究了以咪唑类离子液体1-辛基-3-甲基咪唑六氟磷酸盐([C8mim][PF6])、1-丁基-3-甲基咪唑六氟磷酸盐([C4mim][PF6])和季胺类离子液体三辛基甲基氯化铵([N8881][Cl])为稀释剂,TBP为萃取剂,从硝酸介质中萃取铀酰离子。研究结果表明,铀的萃取分配比随水相初始硝酸浓度的增加而增加,季胺类离子液体略好于咪唑类离子液体,但都比对照稀释剂异辛烷差。研究了以碳酸胍为反萃剂的反萃条件。碳酸胍在实验条件下均能从这3种离子液体萃取体系中定量反萃铀酰离子,解决了用离子液体萃取铀酰离子中的反萃及离子液体的循环使用问题。
The extraction of uranium from nitric acid medium by TBP in room-temperature ionic liquids （RTIL） based on imidazolium ion, such as 1-octyl-3-methylimidazolium hexafluoro- phosphate（[C8 mim] [PF6 ]）, and 1-butyl-3-methylimidazolium hexafluorophosphate （[C, mim] [PF6]）, and on tetraalkylammonium ion, such as trioctyl methyl ammonium chloride（[N8881 ] [Cl]）, was studied. The distribution ratio for extraction of uranium by TBP-RTIL was found to increase with increase of intial nitric acid concentration. Although performance of TBP- [N8881][C1] system is a little better than those of the two TBP-[Cn mim][PF6] systems, none of these three is superior to TBP-isooctane system. The experimental results indicate that the extracted uranium could be completely stripped by aqueous guanidinium carbonate solution from the TBP-RTIL phases. Recycle experiments show that no appreciable decline in the extraction and stripping efficiency is observed after 5 extraction-stripping cycles, and thus TBP- RTIL could be reused.
出处
《核化学与放射化学》
EI
CAS
CSCD
北大核心
2007年第3期146-150,共5页
Journal of Nuclear and Radiochemistry
关键词
离子液体
萃取
铀酰离子
反萃
room-temperature ionic liquids
extraction
uranyl ion
stripping
