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Issue 32, 2019
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Alkali aluminosilicate geopolymers as binders to encapsulate strontium-selective titanate ion-exchangers

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Abstract

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.

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

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Publication details

The article was received on 18 May 2019, accepted on 06 Jul 2019 and first published on 22 Jul 2019


Article type: Paper
DOI: 10.1039/C9DT02108F
Dalton Trans., 2019,48, 12116-12126
  • Open access: Creative Commons BY license
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    Alkali aluminosilicate geopolymers as binders to encapsulate strontium-selective titanate ion-exchangers

    X. Ke, S. A. Bernal, T. Sato and J. L. Provis, Dalton Trans., 2019, 48, 12116
    DOI: 10.1039/C9DT02108F

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