Solvent extraction of thorium, lanthanum and europium ions by bis(2-ethylhexyl)phosphoric acid using 2-nitrobenzo-18-crown-6 as ion size selective masking agent

被引：44

作者：

Zamani, AA ^{[1
]}

Yaftian, MR ^{[1
]}

机构：

[1] Zanjan Univ, Fac Sci, Dept Chem, Zanjan 45195313, Iran

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2004年 / 40卷 / 02期

关键词：

thorium; lanthanides; extraction; bis(2-ethylhexyl)phosphoric acid; crown ethers; masking effect; thermodynamics;

D O I：

10.1016/j.seppur.2004.01.012

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The separation of thorium, lanthanum and europium ions has been improved by acidic extractant bis(2-ethylhexyl)phosphoric acid (DEHPA) in cyclohexane using 2-nitrobenzo-18-crown-6 (NB18C6) as a selective masking agent. The presence of NB 18C6 shifts the extraction curve of lanthanide ions versus pH towards higher pH region. NB 18C6 was efficient masking agent towards lanthanide ions and a better separation was obtained as compared to 18C6. The stability constants of the lanthanide-crown ether complexes in aqueous phase and the thermodynamic parameters associated with the extraction process were evaluated. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：115 / 121

页数：7

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