Alkali aluminosilicate geopolymers as binders to encapsulate strontium-selective titanate ion-exchangers

Xinyuan Ke, Susan A. Bernal, Tsutomu Sato, John L. Provis

Research output: Contribution to journalArticlepeer-review

24 Citations (SciVal)


Alkali-activated metakaolin geopolymers are attracting interest in the conditioning of nuclear wastes, especially for their ability to immobilise cationic species. However, there is limited understanding of the chemical interactions between the encapsulated spent ion-exchangers, used for decontaminating waste water, and the host aluminosilicate matrix. The lack of such understanding makes it difficult to predict the long-term stability of the waste form. In this study, the suitability of using metakaolin based geopolymer as a matrix for encapsulation of titanate-type ion-exchangers loaded with non-radioactive Sr was investigated for the first time, via spectroscopic and microstructural inspection of the encapsulated ion-exchangers and the aluminosilicate gel matrix. The microstructural and chemical properties of metakaolin geopolymers remained stable after encapsulating titanate type spent ion-exchangers, performed desirably as host materials for conditioning of Sr-loaded titanate ion-exchangers.

Original languageEnglish
Pages (from-to)12116-12126
Number of pages11
JournalDalton Transactions
Issue number32
Early online date22 Jul 2019
Publication statusPublished - 28 Aug 2019

ASJC Scopus subject areas

  • Inorganic Chemistry


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