CAJ | 학술논문

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298 K时萃取表观反应平衡常数为(0.18±0.03)L/mol。
연구료이록분기이류대련산(DCPDTPA)재저농도초산개질중대Pu(Ⅲ)적췌취행위,고찰료췌취시간、췌취제농도、평형수상 pH 치、염석제농도이급온도등인소대췌취분배비적영향,학정료췌합물조성화췌취반응방정식。결과표명,DCPDTPA대Pu(Ⅲ)적췌취과정위양리자교환궤리,대응적반응위방열반응,췌취반응함ΔH=(-11.7±0.7)kJ/mol,재298 K시췌취표관반응평형상수위(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 (-1 1.7 ± 0.7 )kJ/mol and an equilibrium constant of (0.18±0.03)L/mol at 298 K.