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<p>Basaltic glass was prepared via the solid-state melt method, using Ce<sup>4+</sup> to simulate tetravalent actinides. The structure, thermal stability and leaching characteristics of basaltic glass with different contents of CeO<sub>2</sub> were investigated. The XRD/SEM-EDX/Raman results showed that the simulated waste loading of CeO<sub>2</sub> in basaltic glass reached ~ 18 wt%, and CeO<sub>2</sub> crystals precipitated when the CeO<sub>2</sub> content reached 20 wt%. XPS analysis revealed that approximately half of the Ce<sup>4+</sup> ions in the basaltic glass doped with CeO<sub>2</sub> were reduced to Ce<sup>3+</sup> ions. The DSC results showed that the thermal stability increased with increasing CeO<sub>2</sub> content. The ASTM product consistency test (PCT) results indicated that all the samples had good leaching resistance. Among them, the standard mass loss of Ce was the greatest after 28 days: The <i>NL</i><sub>Ce</sub> was 2 orders of magnitude lower than those of the other elements.</p>

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Structure and quantification of Ce3+/Ce4+ and stability analysis of basaltic glasses for the immobilization of simulated tetravalent amines

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月17日

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  • Qin Tong,
  • Song Liu,
  • Jun Liang,
  • Qi Zhang,
  • Meiying Liao

摘要

Basaltic glass was prepared via the solid-state melt method, using Ce4+ to simulate tetravalent actinides. The structure, thermal stability and leaching characteristics of basaltic glass with different contents of CeO2 were investigated. The XRD/SEM-EDX/Raman results showed that the simulated waste loading of CeO2 in basaltic glass reached ~ 18 wt%, and CeO2 crystals precipitated when the CeO2 content reached 20 wt%. XPS analysis revealed that approximately half of the Ce4+ ions in the basaltic glass doped with CeO2 were reduced to Ce3+ ions. The DSC results showed that the thermal stability increased with increasing CeO2 content. The ASTM product consistency test (PCT) results indicated that all the samples had good leaching resistance. Among them, the standard mass loss of Ce was the greatest after 28 days: The NLCe was 2 orders of magnitude lower than those of the other elements.