二(2-乙基己基)二硫代磷酸对镅和稀土元素协同萃取的研究  

Extraction of Am^(3+)and rare eaths by DEHDTP combined with TOPO, DPPHEN and TOPS

作　　者：许启初[1] 张利兴[1] 杨裕生[1] 

机构地区：[1]西北核技术研究所,西安710024

出　　处：《核技术》2004年第7期547-550,共4页Nuclear Techniques

基　　金：国家自然科学基金资助项目(29771026)

摘　　要：研究了二(2-乙基己基)二硫代磷酸(DEHDTP)和三辛基氧磷(TOPO)、4,7-二苯基-1,10-邻二氮菲(DPPHEN)、三辛基硫磷(TOPS)三种协萃剂对Am3+、Nd3+、Eu3+、Tm3+的协同(混合)萃取行为。TOPO和DPPHEN有很强的协萃能力,并提高了镅和稀土元素之间的分离系数,前者β(Am/Eu)=3.9,后者β(Am/Eu)=2,而TOPS几乎没有协萃作用。在常量稀土离子存在时分离系数进一步提高,TOPO的β(Am/Eu)=71,DPPHEN的β(Am/Eu)=3。The extraction behavior of Am3 +, Nd3 +, Eu3 + and Tm3 + from NaClO4 solution by di (2-ethylhexyl) di-thiophosphoric acid (DEHDTP) combined with trioctylphosphine oxide ( TOPO ), 4,7-diphenyl-1,10-phenanthroline (DPPHEN) and trioctylphosphine sulfide (TOPS) was studied. While TOPO and DPPHEN give strong synergism and higher selectivity toward Am3 + ( TOPO: β(Am/Eu)= 3.9, DPPHEN: β(Am/Eu)= 2), TOPS presents no synergism. Using DEHDTP combined with TOPO, the separation factor β(Am/Eu) increases as high as 71 in the presence of macroNd(ClO4)3.

关 键 词：协同萃取 镅 镧系元素 

分 类 号：O615.11[理学—无机化学]