摘要
研究了二氯苯基二硫代膦酸(DCPDTPA)在低浓度硝酸介质中对Pu(Ⅲ)的萃取行为,考察了萃取时间、萃取剂浓度、平衡水相pH值、盐析剂浓度以及温度等因素对萃取分配比的影响,确定了萃合物组成和萃取反应方程式。结果表明,DCPDTPA对Pu(Ⅲ)的萃取过程为阳离子交换机理,对应的反应为放热反应,萃取反应焓ΔH=(-11.7±0.7)kJ/mol,在298K时萃取表观反应平衡常数为(0.18±0.03)L/mol。
Extraction behavior of Pu（Ⅲ） from HNO3 solution of low concentration with di- （chlorophenyl）-dithiophosphinic acid（DCPDTPA） in toluene was studied. The distribution ratios of Pu（Ⅲ） were determined as function of extraction time, pH of the aqueous phase, the concentration of NaNO3, concentration of DCPDTPA as well as the ambient tempera- ture. The composition of the extraction complex and the extraction reaction equation are discussed, suggesting that the extraction is mainly a cation exchange process, which is exothermic with the extraction enthalpy of （- 11.7±0. 7） kJ/mol and an equilibrium constant of （0.18±0.03） L/mol at 298 K.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
2014年第2期75-79,共5页
Journal of Nuclear and Radiochemistry
关键词
二氯苯基二硫代膦酸
萃取
Pu(Ⅲ)
di（chlorophenyl） dithiophosphinic acid
extraction
Pu（ Ⅲ ）
