Alkali aluminosilicate geopolymers as binders to encapsulate strontium-selective titanate ion-exchangers.
Alkali aluminosilicate geopolymers as binders to encapsulate strontium-selective titanate ion-exchangers.
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DOI：
10.1039/c9dt02108f
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发表时间：
2019-08
影响因子：
4
通讯作者：
Xinyuan Ke;S. A. Bernal;Tsutomu Sato;J. Provis
中科院分区：
文献类型：
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作者：
Xinyuan Ke;S. A. Bernal;Tsutomu Sato;J. Provis
碱活化的偏高岭土地质聚合物在核废料的调理中引起了人们的兴趣，特别是因为它们能够固定阳离子物种。然而，有有限的理解之间的化学相互作用的封装废离子交换剂，用于净化废水，和主机铝硅酸盐基质。由于缺乏这种了解，因此难以预测废物形态的长期稳定性。在这项研究中，使用偏高岭土为基础的地质聚合物作为封装的钛酸盐型离子交换剂与非放射性锶的基质的适用性进行了研究，第一次，通过光谱和微观结构检查封装的离子交换剂和铝硅酸盐凝胶基质。偏高岭土地质聚合物的微观结构和化学性质在封装钛酸盐型废离子交换剂后保持稳定，理想地作为用于调节负载Sr的钛酸盐离子交换剂的主体材料。
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.