摘要
研究了以煤油为稀释剂、甲基膦酸二(1-甲庚)酯(DMHMP)对硝酸介质中Np(Ⅳ)的萃取性能,考察相接触时间、萃取剂浓度、硝酸根浓度、HNO_(3)浓度和温度对Np(Ⅳ)萃取分配比的影响。萃取过程主要以中性分子形式对Np(Ⅳ)进行萃取,利用斜率分析方法对萃取机理进行了探究,表明萃合物的组成为Np(NO_(3))_(4)·2DMHMP。该反应的焓变为负值,表明萃取反应为放热反应。
The extraction of Np(Ⅳ) from nitric acid medium by using di(1-methyl-heptyl) methyl phosphonate diluted in kerosene was investigated. The influences were studied in this research including the contact time, the concentration of DMHMP, HNO_(3)as well as nitrate and the temperature. Slope analyses indicate that Np(Ⅳ) is coordinated mainly in the form of neutral molecules and the extractant complex is Np(NO_(3))_(4)·2 DMHMP. The value of enthalpy change for the reaction is negative which means that the extraction of Np(Ⅳ) is an exothermic process.
作者
肖哲
李峰峰
汪艺霖
张烨
于婷
贾红伟
何辉
叶国安
XIAO Zhe;LI Feng-feng;WANG Yi-lin;ZHANG Ye;YU Ting;JIA Hong-wei;HE Hui;YE Guo-an(China Institute of Atomic Energy,P.O.Box 275(26),Beijing 102413,China)
出处
《核化学与放射化学》
CAS
CSCD
北大核心
2022年第2期178-185,共8页
Journal of Nuclear and Radiochemistry