Phase structure and aqueous stability of TRPO waste incorporation into Gd2Zr2O7 pyrochlore. Issue 9 (November 2015)

• Record Type: Journal Article
• Authors: Fan, Long; Shu, Xiaoyan; Lu, Xirui; Xie, Yi; Ding, Yi; Duan, Tao; Dang, Bingrong; Wu, Yanlin
• Is Part Of: Ceramics international. Volume 41:Issue 9(2015)Part B
• Page Start: 11741
• Page End: 11747
• Publication Date: 2015-11
• Subjects: Ceramics -- TRPO waste -- Immobilization -- Chemical stability; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.05.140
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The present work explores the potential of Gd2 Zr2 O7 pyrochlore based materials for incorporation of trialkyl phosphine oxides (TRPO) waste which is a mixture of multi-nuclides with multi-valence. A series of (Gd, A)2 (Zr, B)2 O7 ceramics were synthesized to investigate the influence of multi-nuclides incorporation on phase structure and aqueous stability of Gd2 Zr2 O7 . XRD and BSE results show that all the ceramics exhibit a single pyrochlore structure. Raman spectroscopy reveals that the degree of structural order for (Gd, A)2 (Zr, B)2 O7 solid solutions increases with enhanced TRPO waste content. In addition, aqueous stability testing was carried out using the MCC-1 static leach test method. The results demonstrate that the normalized release rates of the elements in TRPO waste are kept in a low value below 10 −4 g m −2 d −1 . La shows the highest normalized release rate of all the involved elements, while Zr exhibits the best chemical stability.