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H2BPM 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
【摘要】 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。
【Abstract】 The synergistic extraction of lanthanide ions(La3+,Pr3+,Nd3+,Gd3+ and Dy3+) by Bis(1′-phenyl-3′-methyl-5′-pyrazolone-4′-yl) butanedione-(H2BPMPBD or H2A) with 1-phenyl-3-methyl-4-trifluoroacetyl-pyrazolone-5(PMTFP) from nitric acid solution has been studied.The synergistic coefficient for La3+is 4.76.The composition of the extracted compound was shown to be LaA·HA·PMTFP.The pH1/2values forLa3+,Pr3+,Nd3+,Gd3+and Dy3+ 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.
【Key words】 synergistic extraction; lanthanide ions; bis(phenyl methyl pyrazolone-yl) butanedione phenyl-methyl-trifluoroacetyl-pyrazolone;
- 【文献出处】 稀土 ,Chinese Rare Earths , 编辑部邮箱 ,2007年03期
- 【分类号】TF804.2
- 【下载频次】95