H_2BPM PBD和PM TFP协同萃取Ln(Ⅲ)的研究

Synergistic Extraction of Lanthanide by Bis(1′-Phenyl-3′-Methyl-5′-Pyrazolone-4′-Yl) Butanedione-[1,4] and 1-Phenyl-3-Methyl-4-Trifluoroacetyl-Pyrazolone-5

研究了1,4-双(1′-苯基-3′-甲基-5′-氧代吡唑-4′-基)丁二酮(H2BPM PBD,简写为H2A)和1-苯基-3-甲基-4-三氟乙酰基吡唑酮-5(PM TFP)的氯仿溶液从硝酸介质中对Ln(Ⅲ)的协同萃取。用斜率法确定了萃合物的组成为LaA.HA.PM TFP,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。

The 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 1 - phenyl - 3-methyl- 4- trifluoroacetyl-pyrazolone-5 （PMTFP） from nitric acid solution has been studied. The synergistic coefficient for La^3＋ is 4. 76. The composition of the extracted compound was shown to be LaA·HA·PMTFP. The pH1/2 values for La^3＋ ,Pr^3＋, Nd^3＋ , Gd^3＋ and Dy^3＋ are 4.36,3. 99, 3.75, 3. 51 and 3.24,respectively. The extraction equilibrium constants, enthalpy change and entropy change of the reaction also have been calculated.