摘要
研究了1-苯基-3-甲基-4-辛酰基吡唑啉酮-5(PMCP或HA)、2-噻吩甲酰三氟丙酮(TTA或HT)和甲基膦酸二异戊酯(DAMP或B)三元萃取剂的甲苯溶液,从高氯酸钠底液中对U(Ⅵ)的协同萃取。发现有显著的二元及三元协萃效应。用斜率法测得萃合物及协萃物的组成分别为UO_2A_2、UO_2A_2B、UO_2T_2B、UO_2AT及UO_2ATB。其萃取平衡常数及协萃平衡常数分别为lgK_A=-0.42、lgK_(AB)=4.21、lgK_(TB)=3.83、lgK_(AT)=-0.60、lgK_(ATB)=4.27(25℃)。讨论了萃合物及协萃物的可能结构式。
This paper studied the synergistic extraction of Uranium (Ⅵ) from sodium perchlorate solution with ternary system of 1-phenyl-3-methyl-4-caprylyl pyrazolone-5 (PMCP or HA),thenoyl trifluo-roacetone (TTA or HT) and diisoamyl methyl phosphonate (DAMP or B). The formation of a singlet extracted complex UO2A2,two binary adduct complexes,i, e. UO2A2B,UO2T2B and a ternary extracted complex UO2ATB were confirmed by slope analysis. The equilibrium constants at 25±1℃ were determined to be KA = 10-0.42(UO22+ + PMCP system) , KAB = 104.21(UO22+ + PMCP + DAMP system) and KATB = 104.27(UO22+ + PMCP + TTA + DAMP system) respectively.The mechanism of extraction and structures of the extracted species have been discussed.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
1993年第1期50-55,共6页
Journal of Nuclear and Radiochemistry
关键词
PMCP
TTA
DAMP
协同萃取
铀
PMCP TTA DAMP Synergistic extraction Uranium (Ⅵ) Equilibrium constants.
