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
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
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DOI：
10.1016/j.seppur.2004.01.012
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发表时间：
2004-12
影响因子：
8.6
通讯作者：
A. Zamani;M. Yaftian
中科院分区：
文献类型：
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作者：
A. Zamani;M. Yaftian
以2-硝基苯并-18-冠-6（NB_（18）C_6）为选择性掩蔽剂，在环己烷介质中，用酸性萃取剂双（2-乙基己基）磷酸（DEHPA）改进了钍、镧、铕的分离。NB 18 C6的存在使镧系离子对pH的萃取曲线向更高pH区域移动。NB_（18）C_6是一种有效的镧系离子掩蔽剂，与~（18）C_6相比，具有更好的分离效果。测定了稀土冠醚配合物在水相中的稳定常数以及萃取过程的热力学参数。
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 NB18C6 shifts the extraction curve of lanthanide ions versus pH towards higher pH region. NB18C6 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.