摘要
研究了1,4-双(1′-苯基-3′-甲基-5′-氧代吡唑-4′-基)丁二酮(H2BPMPBD,简为H2A)和三正辛基氧化膦(TOPO)的氯仿溶液从硝酸介质中对Ln3+的协同萃取。用斜率法确定了萃合物的组成为LaA.HA.TOPO,考察了萃取剂浓度和溶液酸度对萃取机理的影响,测定了半萃取pH1/2值和萃取反应平衡常数Ks.e.,求得了反应的焓变和熵变。
Synergistic extraction of lanthanide ions （La^3＋ , Pr^3＋, Nd^3＋, Gd^3＋ and Dy^3＋ ） by bis （ 1′- phenyl - 3′- methyl-5′-pyrazolone-4′-yl） butanedione - [1,4]（H2BPMPBD or H2A） with trioctylphospine oxide （TOPO） from nitric acid solution has been studied. The synergistic coefficient for La^3＋ is 4.45. The composition of the extracted compound was shown to be LaA · HA · TOPO. The pH1/2 values for La^3＋ , Pr^3＋ , Nd^3＋ , Gd^3＋ and Dy^3＋ are 4.38, 4.00, 3.77, 3.54 and 3.25,respectively. The extraction equilibrium constants, enthalpy change and entropy change of the reaction also have been calculated.
出处
《稀土》
EI
CAS
CSCD
北大核心
2005年第4期33-35,41,共4页
Chinese Rare Earths
基金
陕西省自然科学研究基金项目(2000H07)
