Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 19 Kosygin street, Moscow 119991, Russia.
Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 19 Kosygin street, Moscow 119991, Russia.
J Chromatogr A. 2021 Nov 8;1657:462581. doi: 10.1016/j.chroma.2021.462581. Epub 2021 Sep 30.
For the first time, widespread aqueous biphasic polymer-salt extraction system was applied for selective separation of Pd(II) and Pt(IV) from chloride technological solutions by countercurrent chromatography using a rotating coiled column (an analog of centrifugal extractor). The principle novelty of the proposed approach is the possibility of multistage extraction process and the needlessness to add any specific reagents for targeted metal binding. The results showed that the use of poly(ethylene glycol)-1500 (PEG-1500) as a stationary phase allows 96-100% of both Pd(II) and Pt(IV) to be recovered from chloride solutions containing copper and nickel. To obtain individual solutions of targeted metals it is enough to change the composition of the salt-rich phase for stripping stage, in particular the salt concentration and pH value. The final purity of the targeted metal fractions obtained after their extraction from model technological solutions is ≥ 99.9%. The components of the aqueous biphasic system are recyclable, non-toxic, available, and widespread in laboratory and technology practice. A scheme of the multistage separation of platinum metals using a rotating coiled column is proposed.
首次应用广泛的水相两相聚合物-盐萃取体系，通过逆流色谱法（离心萃取器的模拟装置），使用螺旋盘管柱，从氯化技术溶液中选择性地分离钯（II）和铂（IV）。该方法的原理新颖之处在于可以进行多级萃取过程，并且不需要添加任何特定的试剂来靶向金属结合。结果表明，使用聚乙二醇-1500（PEG-1500）作为固定相，可以从含有铜和镍的氯化溶液中回收 96-100%的钯（II）和铂（IV）。为了获得目标金属的单独溶液，只需改变洗脱阶段富盐相的组成，特别是盐浓度和 pH 值。从模型技术溶液中萃取后，目标金属馏分的最终纯度≥99.9%。水相两相系统的组分是可回收的、无毒的、可用的，并且在实验室和技术实践中广泛存在。提出了一种使用螺旋盘管柱进行铂族金属多级分离的方案。
