(DdO)2DGA萃取Nd(Ⅲ)形成三相的研究  

Third Phase Formation in Extraction of Nd(Ⅲ)by(DdO)2DGA

作　　者：何喜红 卢淳[1] 叶国安 李林波[1,3] 曹智[2] 王薪尧 HE Xihong;LU Chun;YE Guoan;LI Linbo;CAO Zhi;WANG Xinyao(School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Department of Radiochemistry,China Institute of Atomic Energy,Beijing 102413,China;Shaanxi Engineering Research Center of Metallurgical,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]中国原子能科学研究院放射化学研究所,北京102413 [3]陕西省冶金工程技术研究中心,陕西西安710055

出　　处：《原子能科学技术》2020年第11期1999-2005,共7页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(21790371)。

摘　　要：N,N′-二辛基-N,N′-二(十二烷基)-3-氧戊二酰胺((DdO)2DGA)是一种用于提取高放废液中三价锕系、镧系元素的不对称酰胺荚醚萃取剂,为确定其在萃取时的三相行为,本文以镧系元素中的代表性元素Nd为研究对象,考察酸度、温度、共存离子浓度对(DdO)2DGA-正十二烷体系萃取Nd(Ⅲ)的极限有机相浓度(LOC)的影响,并采用红外光谱、紫外-可见吸收光谱、荧光光谱研究了三相出现前后(DdO)2DGA-Nd(Ⅲ)萃合物结构的变化。结果表明,降低酸度、升高温度、降低共存离子浓度,Nd(Ⅲ)的LOC增加,但三相出现前后,萃合物结构没有改变,三相的形成是由于萃合物聚集形态改变所致。N,N′-di-octyl-N,N′-di-dodecyl-3-oxapentane-1,5-diamide((DdO)2DGA)is a new unsymmetrical diglycolamide extractant for the separation of trivalent actinides and lanthanides from high level liquid waste.In this paper,the representative element Nd in lanthanides was taken as the research object to study the third phase formation behavior of Nd(Ⅲ)in(DdO)2DGA,the influence of aqueous phase acidity,temperature and co-existing metal ion concentration on the limiting organic concentration(LOC)of Nd(Ⅲ)in(DdO)2DGA/n-dodecane solution was investigated.The structural variation of(DdO)2DGA-Nd(Ⅲ)complex formed in the organic phase before and after third phase formation was also studied by infrared spectra,UV-vis spectra and fluorescence spectra.The results show that LOC of Nd(Ⅲ)increases with temperature,and decreases with increase of aqueous acidity and co-existing metal ion concentration.However,the structure of(DdO)2DGA-Nd(Ⅲ)complex is not varied before and after third phase formation,and the reason for third phase formation is the variation of aggregation behavior of extracted complexes.

关 键 词：(DdO)2DGA 三相 Nd(Ⅲ) 萃合物结构 

分 类 号：TL941.1[核科学技术—辐射防护及环境保护]