open access

https://hdl.handle.net/2115/81926

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

英語

2019-07-22

Royal Society of Chemistry

Dalton Transactions

48(32)

12116-12126

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.

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Creative Commons Attribution 3.0 Unported

1477-9226

1477-9234

AA11810256