Intramolecular synergism for group separation extraction of trivalent rare earths with a cross type calix[4]arene with phosphonic and carboxylic acid bifunctionality
Intramolecular synergism for group separation extraction of trivalent rare earths with a cross type calix[4]arene with phosphonic and carboxylic acid bifunctionality
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具有膦酸和羧酸双功能的交叉型杯[4]芳烃基团分离萃取三价稀土的分子内协同作用
DOI：
10.1007/s10847-014-0457-8
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Jumina
中科院分区：
文献类型：
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作者：
A. B. Chetry;T. Matsufuji;B. B. Adhikari;S. Morisada;H. Kawakita;K. Ohto;T. Oshima;Jumina
为了研究三价稀土与选定的二价金属的萃取行为，制备了一种组织良好的锥形构型的杯[4]芳烃衍生物，其羧基和膦酸基团位于远端对。由于这些三价离子与上述两个官能团的互补性而不与苯氧基氧原子螯合，该产品对稀土元素表现出比所研究的二价金属更高的萃取能力。稀土的萃取是通过一种离子交换进行的，其中三个质子被一个 Ln(III) 阳离子取代。稀土络合的化学计量也通过斜率分析、加载测试和连续变化程序确定。上述试剂对各个稀土离子的萃取能力是恒定的，并且它们相对于其他金属离子的基团分离被证明是可能的。结论是，杯芳烃结构上两个不同官能团的存在导致与镧系元素产生有利的协同相互作用。还报告了负载金属的剥离实验结果。
A well organized calix[4]arene derivative in the cone configuration with carboxylic and phosphonic acid groups positioned at distal pairs has been prepared in order to investigate the extraction behavior of trivalent rare earths together with selected divalent metals. This product exhibited high extraction ability for the rare earths over the divalent metals investigated due to the complementarity of these trivalent ions with the above two functional groups without chelation to the phenoxy oxygen atoms. The extraction of the rare earths takes place by one of ion-exchange, where three protons are replaced by one Ln(III) cation. The stoichiometry of rare earth complexation was also determined by slope analysis, loading test and the continuous variation procedures. The extraction ability of the above reagent towards the respective rare earth ions was constant and their group separation over other metal ions proved possible. It was concluded that the presence of the two different functional groups on the calixarene structure results in a favorable synergistic interaction with the lanthanides. The results of stripping experiments for the loaded metals are also reported.