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Gel formation in extracted organic phase and FT-IR characterization

机译：萃取有机相中的凝胶形成和FT-IR表征

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IN the early 1980s, Wu and co-workers indicated that the saponification of acidic extractants, such as di(2-ethylhexyl) phosphoric acid (D2EHPA), 2-ethylhexyl phosphoric acid mono 2-ethylhexylester (PC88A), and naphthenic acid (NA), is a process of the formation of a wa-ter-in-oil (w/o) microemulsion in the organic phase. From then on, the aggregation behavior of this sort of extractant and metal-extractant complex in bulk phases has been investigated for about twenty years. The microstructure and properties of organic aggregates were extensively studied with traditional methods, such as liquid-liquid distribution equilibrium of metallic ions and measuring of interfacial tension between two bulk phases, and modern techniques, e.g. FT-IR, NMR, TEM, DLS, etc. The experimental results showed that the metal-loading organic phase is not a real solution, but a reversed micelle or a w/o microemulsion. It was also found that water plays an important role in both the formation and destruction processes of aggregates in the extracted organic phase. In the present work, we found, for the first time, that a gel phase was formed in the extraction process of lanthanide ions with saponified di(l-methyl-heptyl) phosphoric acid (DMHPA), and gave a preliminary explanation to the mechanism of gel formation.
机译：在1980年代初期，Wu和他的同事指出，酸性萃取剂的皂化作用有酸性，例如二（2-乙基己基）磷酸（D2EHPA），2-乙基己基磷酸单2-乙基己酯（PC88A）和环烷酸（NA）。 ）是在有机相中形成油中水（w / o）微乳液的过程。从那时起，已经研究了这种萃取剂和金属萃取剂复合物在本体相中的聚集行为约二十年。用传统方法对有机聚集体的微观结构和性能进行了广泛研究，例如金属离子的液-液分布平衡，两个本体相之间界面张力的测量以及现代技术，例如FT-IR，NMR，TEM，DLS等。实验结果表明，负载金属的有机相不是真正的溶液，而是反胶束或无水乳液。还发现水在萃取的有机相中聚集体的形成和破坏过程中都起着重要作用。在本工作中，我们首次发现在皂化二（1-甲基庚基）磷酸（DMHPA）萃取镧系离子过程中形成了凝胶相，并对其机理进行了初步解释。的凝胶形成。

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