Separation of lanthanides and actinides using magnetic silica particles bearing covalently attached tetra-CMPO-calix[4]arenes
作者:Volker Böhmer、Jean-François Dozol、Cordula Grüttner、Karine Liger、Susan E. Matthews、Sandra Rudershausen、Mohamed Saadioui、Pingshan Wang
DOI:10.1039/b405602g
日期:——
Calix[4]arene tetraethers in the cone conformation bearing four –NH–CO–CH2–P(O)Ph2
(= CMPO) residues on their wide rim and one, two or four ω-amino alkyl residues of various lengths at the narrow rim were synthesized. Reaction with dichlorotriazinyl (DCT) functionalized magnetic particles led to complete coverage of the available surface by covalently linked CMPO-calix[4]arenes in all cases. Magnetically assisted removal of Eu(III) and Am(III) from acidic solutions was distinctly more efficient with these particles in comparison to analogous particles bearing the same amount of analogous single-chain CMPO-functions. The best result, an increase of the extraction efficiency by a factor of 140–160, was obtained for attachment via two propyl spacers. The selectivity Am/Eu was in the range of 1.9–2.8. No decrease of the extraction ability was observed, when the particles were repeatedly used, after simple back extraction with water.
合成了锥形构象的Calix[4]arene四醚,其宽边缘上带有四个–NH–CO–CH2–P(O)Ph2(即CMPO)残基,而窄边缘上则带有一个、两个或四个不同长度的ω-氨基烷基残基。与二氯三嗪基(DCT)功能化磁粒子的反应使得所有情况下可用表面完全被共价连接的CMPO-Calix[4]arene覆盖。与相似的、具有相同数量的单链CMPO功能的颗粒相比,这些颗粒在磁助去除酸性溶液中的Eu(III)和Am(III)时明显更有效。最佳结果是通过两个丙基间隔基附加时,提取效率提高了140–160倍。Am/Eu的选择性在1.9–2.8之间。重复使用颗粒后,在用水简单回收提取的情况下,并未观察到提取能力的下降。