TODGA/[C_2mim][NTf_2]萃取Th^(4+)  

Solvent Extraction of Th^(4+) with TODGA in [C_2mim][NTf_2]

作　　者：刘超[1] 赵龙[1] 韦悦周[1] 何林峰[2] 唐方东[2] 

机构地区：[1]上海交通大学核科学与工程学院,核能化工实验室,上海200240 [2]上海市计量测试技术研究院,化学与电离辐射计量技术研究所,上海201203

出　　处：《无机化学学报》2015年第1期121-126,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金资助项目(11475112;91126006);上海高校特聘教授(东方学者)岗位计划资助项目

摘　　要：研究了N,N,N′,N′-四辛基-3-氧戊二酰胺(TODGA)溶于疏水性离子液体咪唑类离子液体1-乙基-3-甲基咪唑双三氟甲磺酰亚胺盐([C2mim][NTf2])中对硝酸水溶液体系中四价钍离子(Th4+)的萃取行为。详细考察了接触时间、酸度、Th4+浓度、TODGA浓度、温度对TODGA/[C2mim][NTf2]体系萃取性能的影响。作为对比,我们还考察了TODGA在传统有机溶剂异辛烷中对Th4+的萃取。结果表明:TODGA/[C2mim][NTf2]体系对Th4+的萃取是吸热反应,且在50℃下,能在5 min内达到平衡。萃取体系随着酸度对Th4+的萃取性能先降后增大;Th4+浓度的增大,TODGA浓度的降低,对Th4+的萃取性能下降。TODGA在离子液体萃取体系中比在有机体系中有更好的Th4+萃取效果,特别是在低酸条件下。通过萃取机理研究,推测出在低酸下萃取反应是离子交换且TODGA与Th4+配比为2∶1,在高酸下萃取是中性配位。The extraction behavior of Th^4＋ from nitric acid solution with N,N,N′,N′-tetraoctyldiglycolamide（TODGA） dissolved in hydrophobic ionic liquid [C2mim][NTf2] was studied.The effect of contact time,acidity,Th^4＋ concentration,TODGA concentration and temperature on the extraction performance of TODGA/[C2mim] [NTf2]system were investigated.For comparison,the same experiment in TODGA/isooctane system was also done.The results showed that the extraction of TODGA/[C2mim] [NTf2] system against Th^4＋was endothermic reaction and could balance within 5 min at 50 ℃.The extraction efficiency decreased first and then increased with the in-creasing of acidity and Th^4＋concentration as well as decreasing of TODGA concentration.It was found that TODGA/[C2mim] [NTf2] system had better extraction efficiency than TODGA/isooctane system especially at low acidity.The extraction mechanism was suggested that at low acidity the extraction proceed via ion exchange mechanism to a coordination compound,and the mechanism at the high acidity was neutral complex.

关 键 词：四价钍离子 N N N′ N′-四辛基-3-氧戊二酰胺 离子液体 萃取 

分 类 号：O658.2[理学—分析化学] O614.42[理学—化学]