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Liquid-liquid extraction of uranium(VI) and thorium(IV) by two open-chain crown ethers with terminal quinolyl groups in chloroform

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Abstract

Two open-chain crown ethers 2,2'-(ethylenedioxy)bis[(8-quinolyloxymethyl)benzene], (L1), and 2,2'-(ethylenedioxy)bis[(8-quinaldyloxymethyl)benzene], (L2) have been prepared and characterized by using elemental analysis, IR spectra, 1H NMR spectra and positive-ion FAB mass spectra. The extraction of UO2 2+ and Th4+ by both open-chain crown ethers, L1 and L2 in chloroform as a diluent was studied at 25 °C. Extraction distribution ratios (D) of UO2 2+ and Th4+ were investigated as a function of pH, lithium picrate concentration, and extractant concentration. Based on the expertimental results, it was found that 1 : 1 complexes were formed involving either UO2 2+ or Th4+ with L1, and Th4+ with L2. The extractability of L1 for Th4+ is significantly higher than that for UO2 2+, the extractabilities of L1 and L2 for Th4+ being almost identical. L1 and L2 used here are not feasible for industry because of their relatively low extractabilities for Th4+ at pH<2.0 and for UO2 2+ at the extraction conditions used in this work.

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P.R. China

    Guo Zhijun, Wu Wangsuo, Shao Dadong & Tan Minyu

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  1. Guo Zhijun
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  2. Wu Wangsuo
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  3. Shao Dadong
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  4. Tan Minyu
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Zhijun, G., Wangsuo, W., Dadong, S. et al. Liquid-liquid extraction of uranium(VI) and thorium(IV) by two open-chain crown ethers with terminal quinolyl groups in chloroform. Journal of Radioanalytical and Nuclear Chemistry 258, 199–203 (2003). https://doi.org/10.1023/A:1026203402893

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  • DOI: https://doi.org/10.1023/A:1026203402893

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