摘要
研究了1,4-双(1′-苯基-3′-甲基-5′-氧代吡唑-4′-基)丁二酮-[1,4](H2BPMPBD,简为H2A)和氨基比林(AP)的氯仿溶液从硝酸介质中对Ln( )的协同萃取。用斜率法确定了萃合物的组成为LaA·HA·(AP)2,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+), Dy^(3+)) by Bis(1′-phenyl-3′-methyl-5′-pyrazolone-4′-yl) butanedione - [1,4](H_2BPMPBD or H_2A) with Aminopyrine(AP) from nitric acid solution has been studied.The synergistic coefficient for La^(3+) is 7.02. The composition of the extracted compound was shown to be LaA·HA·(AP)_2. The pH_(1/2) values for La^(3+), Pr^(3+), Nd^(3+), Gd^(3+) and Dy^(3+) are 4.28, 3.84, 3.60, 3.38 and 3.09,respectively. The extraction equilibrium constants, enthalpy change and entropy change of the reaction have been also calculated.
出处
《稀土》
EI
CAS
CSCD
北大核心
2004年第4期32-35,共4页
Chinese Rare Earths
基金
陕西省自然科学研究基金项目(2000H07)
