摘要
本文进一步研究了螯合－中性协同萃取体系：１－苯基－３－甲基－４－（２′－氯苯甲酰基）吡唑酮－５（ＰＭＣＢＰ）分别与三辛基氧膦（ＴＯＰＯ）、二辛基亚砜（ＤＯＳＯ）、二环己基亚砜（ＤＣｙＨＳＯ）和磷酸三丁酯（ＴＢＰ）的二甲苯溶液从盐酸介质中对铕（Ⅲ）的萃取．实验结果表明均有明显的协同应采用斜率法测定了协萃配合物的组成为：ＥｕＡ２·Ｃｌ·Ｂ（ＨＡ＝ＰＭＣＢＰ，Ｂ＝ＴＯＰＯ，ＤＯＳＯ，ＤＣｙＨＳＯ，ＴＢＰ）．中性萃取剂的协萃能力是：ＴＯＰＯ＞ＤＯＳＯ＞ＤＣｙＨＳＯ＞ＴＢＰ．计算了它们的萃取平衡常数。
A study of the synergistic extraction of europium(Ⅲ) from hydrochloric acid solution by using chelating agent: 1-phenyl-3-methyl-4-(2′-chlorobenzoyl)-pyrazolone-5 (PMCBP) and the neutral extractants trioctylphosphine oxide(TOPO), dioctyl sulfoxide(DOSO), dicyclohexyl sulfoxide (DC y HSO) and tributylphosphate (TBP) in xylene has been respectively described. Some synergistic effects have been observed. The experimental results suggest that the composition of synergistic complex species be EuA2·Cl·B (where HA=PMCBP, B=neutral extractants). Synergistic extraction power of the neutral extractants increases as follows: TOPO>DOSO>DC y HSO>TBP. The equilibrium constants for these synergistic extraction have been calculated and the mechanism of the synergistic extraction is discussed as well.
关键词
螯合萃取剂
中性萃取剂
协同萃取
铕
Chelating agent, Neutral extractant, Synergistic extraction, Europium
