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N,N,N′,N′-tetra(2-ethylhexyl) diglycolamide (T2EHDGA), an efficient extractant for f-block elements, is widely used in the extraction of lanthanides and actinides from high-level liquid waste. In this study, kerosene was selected as the organic diluent, the batch extraction experiments were conducted to investigate the extraction performance of T2EHDGA/kerosene. The findings of the study demonstrate that T2EHDGA/kerosene has excellent extraction properties at high acidity levels, with rapid complexation and satisfactory selectivity for trivalent lanthanides. Furthermore, the radiolysis performance of T2EHDGA/kerosene contacted with HNO3 aqueous phase was investigated, using the ultra-high performance liquid chromatography technique. After γ-irradiation, many types of radiolysis products of T2EHDGA were measured and identified. The analysis of the structural characteristics of these radiolysis products provided evidence to suggest that the predominant radiolysis pathways of T2EHDGA occurred through the cleavage of the amide bond, ether bond, Coctyl–N, and Camide–Cether bond. A slight protective effect for the structural integrity of T2EHDGA was provided by HNO3, particularly at elevated absorbed dose. This assertion was substantiated by the findings of extraction isotherm experiments involving irradiated T2EHDGA/kerosene in various samples.

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Extraction and γ-Radiation Radiolysis Performance of T2EHDGA in Kerosene Solvent

  • 会议论文

  • 发表日期：

    2026年

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  • J. W. Zheng,
  • H. J. Sang,
  • M. H. Chen,
  • Y. Wu,
  • Y. Z. Wei

摘要

N,N,N′,N′-tetra(2-ethylhexyl) diglycolamide (T2EHDGA), an efficient extractant for f-block elements, is widely used in the extraction of lanthanides and actinides from high-level liquid waste. In this study, kerosene was selected as the organic diluent, the batch extraction experiments were conducted to investigate the extraction performance of T2EHDGA/kerosene. The findings of the study demonstrate that T2EHDGA/kerosene has excellent extraction properties at high acidity levels, with rapid complexation and satisfactory selectivity for trivalent lanthanides. Furthermore, the radiolysis performance of T2EHDGA/kerosene contacted with HNO3 aqueous phase was investigated, using the ultra-high performance liquid chromatography technique. After γ-irradiation, many types of radiolysis products of T2EHDGA were measured and identified. The analysis of the structural characteristics of these radiolysis products provided evidence to suggest that the predominant radiolysis pathways of T2EHDGA occurred through the cleavage of the amide bond, ether bond, Coctyl–N, and Camide–Cether bond. A slight protective effect for the structural integrity of T2EHDGA was provided by HNO3, particularly at elevated absorbed dose. This assertion was substantiated by the findings of extraction isotherm experiments involving irradiated T2EHDGA/kerosene in various samples.