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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >N-Alkyl calix[4]azacrowns for the selective extraction of uranium
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N-Alkyl calix[4]azacrowns for the selective extraction of uranium

机译：n-alkyl calix [4]用于选择性提取铀的阿扎克雷罗

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摘要

The selective extraction of uranium by N-octylcalix[4]azacrown (NOCAC) and N-ethylhexylcalix[4]azacrown (NEHCAC) was investigated. The ligands were synthesised in three steps through the functionalisation of t-butyl calix[4]arene at the distal-1,3-positions of the lower rim with ethyl acetate groups followed by cyclisation with (imino)bis(ethane-2,1-diyl)diamide. A detailed investigation on the effect of various parameters, such as the aqueous phase acidity (sulfuric acid), the ionic strength, and ligand concentration, on the extraction of uranium(VI) has been conducted. The effect of the H2SO4 concentration has been studied from 0.02 to 3 M. Preliminary studies carried out on NOCAC in dodecane/octanol diluents showed that the uranium extraction from sulfuric acid is more efficient at a low H2SO4 concentrations. The stoichiometry of complexation was estimated from the slope method, NMR titration, and electrospray ionisation-mass spectrometry analysis. Both ligands were found to be highly selective for uranium(VI) over other competitive cations present in a simulated leach solution containing seven competitive cations. The successful recovery of the uranium from the organic phase has been performed thanks to stripping steps involving ammonium oxalate, ammonium carbonate, and sodium carbonate as stripping agents.
机译：研究了N-Octylcalix [4]硫克啰嗦（NOCC）和N-乙基己基丙酸[4]硫酰胺（NEHCAC）的选择性提取。通过在下边缘的下轮辋的叔丁基杯[4]芳烃与乙酸乙酯基团的远端-1,3 - 位置，然后用（伊氨基）双（乙烷-2,1）来合成三个步骤-diyl）酰胺。已经进行了对各种参数的效果的详细研究，例如水相酸度（硫酸），离子强度和配体浓度，对铀（VI）的提取进行了详细的研究。已经研究了H 2 SO 4浓度的效果从0.02〜3米中研究了在十二烷/辛醇稀释剂中对NOCC进行的初步研究表明，硫酸中的铀萃取在低温H 2 SO 4浓度下更有效。从斜坡法，NMR滴定和电喷雾电离质谱分析估计络合的化学计量。发现两个配体对含有七种竞争性阳离子的模拟浸出溶液中存在的其他竞争性阳离子来说，对铀（VI）具有高度选择性。由于涉及草酸铵，碳酸铵和碳酸钠作为汽提剂的汽提步骤，已经进行了来自有机相的铀的成功回收。

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