摘要
本文研究了以磺化煤油为稀释剂,N,N,N′,N′-四(2-乙基己基)-3-氧戊二酰胺(T2EHDGA)从硝酸中对U(Ⅵ)的萃取性能。考察了HNO_3浓度、T2EHDGA浓度、盐析剂浓度及温度对萃取性能的影响。该萃取过程为一放热过程,在所研究的条件下没有三相的形成。给出了萃取机理,确定由2个萃取剂分子参与U(Ⅵ)配位,其萃合物组成为UO_2(NO_3)_2·2T2EHDGA。通过红外光谱确定了由羰基及醚氧键参与配位。
The extractive properties of N,N,N′,N′-tetra-2-ethylhexyldiglycolamide（T2EHDGA） were examined for the extraction of uranium（Ⅵ） from nitric acid medium, in which sulfonated kerosene was used as diluent. There′s no third phase formation under the studied conditions. The number of ligand molecules present in the stoichiometry of the extracted species of U （Ⅵ） was found to be two. Thermodynamics studies suggested that the extraction is exothermic. The extraction influence of nitric acid concentration and T2 EHDGA concentration as well as salting-out agent and temperature on the extraction distribution ratio was investigated. The extraction mechanism was established and the stoichiometry of the main extracted species was confirmed to be UO-2（NO-3）-2·2T2EHDGA. The IR spectra of the loaded organic phase were also recorded.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2016年第6期1089-1094,共6页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.21171069,21077044)资助项目
