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Structural evolution of annealed Cs-exchanged copper hexacyanoferrate (Cs,K)2CuFe(CN)6 loaded on mesoporous silica particles

Abstract : Porous silica particles functionalized by potassium copper hexacyanoferrate (CsKCu-HCF@silica) are currently studied as a selective sorbent to remove radioactive cesium from contaminated effluents. After use, these spent particles need to be transformed into a dense waste form. A hot isostatic pressing (HIP) treatment under argon is envisaged to achieve this goal. As a preliminary study to the HIP, this paper reports the thermal behaviour of CsKCu-HCF@silica particles, at a laboratory scale. It was shown that an immediate HIP of spent particles is not possible. As an alternative, a first air annealing prior to HIP leads to (i) decomposition of KCu-HCF (ii) a reduction of the specific surface with closing of the mesoporosity (iii) crystallization of silica into cristobalite (iv) an in-situ formation of a Cs based silicate glass in the siliceous particles leading to no significate Cs loss. The results are discussed and put into a perspective for the upcoming HIP test.
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https://hal-cea.archives-ouvertes.fr/cea-02340029
Contributor : Bibliothèque Cadarache <>
Submitted on : Wednesday, October 30, 2019 - 4:01:39 PM
Last modification on : Monday, May 11, 2020 - 4:40:11 PM

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Agnès Grandjean, L. Campayo, N. Massoni, A. Hertz, M. Moloney, et al.. Structural evolution of annealed Cs-exchanged copper hexacyanoferrate (Cs,K)2CuFe(CN)6 loaded on mesoporous silica particles. Journal of Hazardous Materials, Elsevier, 2019, ⟨10.1016/j.jnucmat.2019.151887⟩. ⟨cea-02340029⟩

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