Leaching stability of simulated waste forms for immobilizing An3+ by Gd2Zr2O7 with Nd3+

Xirui Lu, Mengjun Chen, Faqin Dong, Xiaoli Wang, Yanlin Wu, Zhengxue Xiao

Research output: Contribution to journalArticle

Abstract

In order to investigate the anti-leaching capability of pyrochlore Gd2Zr2O7 immobilized An3+, trivalent neodymium was used as the simulacrums for radioactive wastes with trivalence, Gd2−xNdxZr2O7(0.0⩽x⩽2.0) series samples were successfully synthesized by high temperature solid reaction and using Gd2O3, ZrO2 powders as starting materials. The experiments of long-term chemical stability were conducted in synthetic seawater at 40 and 70 °C. The XRD diffractive data and extraction ratio of as-received samples were collected with the help of X-ray diffraction (XRD) instrument and inductively coupled plasma mass spectrometry (ICP-Mass). The results indicate that the phases of as-received compounds keep the single phase of pyrochlore. The extraction ratio of Gd3+, Zr4+ and Nd3+ in waste forms is increasing with the increase of immersion time in synthetic seawater. The extraction ratio of waste forms at 70 °C is higher than at 40 °C. The highest extraction ratio of Gd3+, Zr4+ and Nd3+ after 42 days is near 0.025 8, 0.003 8 and 0.045 2 μg·mL−1, respectively.

Original languageEnglish
Pages (from-to)885-890
Number of pages6
JournalJournal Wuhan University of Technology, Materials Science Edition
Volume29
Issue number5
DOIs
Publication statusPublished - 2014 Oct 4
Externally publishedYes

Keywords

  • anti-leaching capability
  • pyrochlore
  • radioactive waste with trivalence
  • waste forms

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint Dive into the research topics of 'Leaching stability of simulated waste forms for immobilizing An<sup>3+</sup> by Gd<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> with Nd<sup>3+</sup>'. Together they form a unique fingerprint.

  • Cite this