Solvent extraction of alkaline earths and lanthanides using crown ethers as ion size selective masking reagents: A macrocycle application
Solvent extraction of alkaline earths and lanthanides using crown ethers as ion size selective masking reagents: A macrocycle application
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使用冠醚作为离子尺寸选择性掩蔽剂溶剂萃取碱土金属和镧系元素：大环应用
DOI：
10.1021/ac00104a025
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发表时间：
1995
影响因子：
7.4
通讯作者：
M. Matsui
中科院分区：
文献类型：
--
作者：
S. Tsurubou;M. Mizutani;Y. Kadota;Tadashi Yamamoto;S. Umetani;T. Sasaki;Quyen T. H. Le;M. Matsui
用1-苯基-3-甲基-4-苯甲酰基-5-吡唑酮和三正辛基氧化膦萃取碱土金属，用双（2-乙基己基）磷酸萃取镧系元素，可获得较好的萃取分离效果。在这两种情况下，通过向水相中加入18-冠-6作为离子尺寸选择性掩蔽剂，具有较大离子半径的金属离子的萃取转移到较高的pH区域。因此，增强了金属离子之间的分离。环己烷用于有机相。18-冠-6在环己烷和水之间的分配比低，即，18-冠-6定量地保留在水相中。以苯为有机相时，18-冠-6对碱土金属有沿着协同萃取作用，TOPO对碱土金属有掩蔽作用，18-冠-6的分布对萃取有不可忽视的影响
Improved extraction-separation can be achieved in the extractions of alkaline earths with 1-phenyl-3-methyl-4- benzoyl-5-pyrazolone and tri-n-octylphosphine oxide and of lanthanides with bis(2-ethylhexyl)phosphoric acid. In both cases, by adding 18-crown-6 to the aqueous phase as an ion size selective masking reagent, the extractions of metal ions with larger ionic radii shifted to the higher pH region. Consequently, the separation among the metal ions was enhanced. Cyclohexane was employed for the organic phase. The distribution ratio of 18-crown-6 between cyclohexane and water is low, i.e., 18-crown-6 remains quantitatively in the aqueous phase. The synergistic extraction of alkaline earths with 18-crown-6 was observed along with that with TOPO being subject to the masking reaction when benzene was used for the organic phase, to which the distribution of 18-crown-6 is not negligible