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Issue 30, 2020

New insights into the radiolytic stability of metal(iv) phosphonate hybrid adsorbent materials

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Abstract

Stable metal(IV) phosphonate hybrids are a promising class of materials for the critical issue of nuclear waste cleanup. However, to be of practical use, adsorbent materials must demonstrate radiolytic stability and this property remains poorly understood. Therefore, the radiolytic stabilities of post-functionalised mesoporous zirconium titanate and zirconium phosphonate coordination polymers were compared. For the first time, solid-state 31P MAS-NMR was used to probe the radiolytic degradation of metal(IV) phosphonates and provide mechanistic insight. Polyphosphonate-functionalized hybrids were more stable than monophosphonate hybrids, as the monophosphonate readily detached from the oxide surface. The zirconium phosphonate coordination polymer (Zr-ATMP) demonstrated the greatest radiolytic stability, attributed to its high ligand loading and intimately mixed structure. Zr-ATMP maintained highly efficient sorption from strongly acidic solutions even after receiving doses of gamma radiation up to 2.9 MGy.

Graphical abstract: New insights into the radiolytic stability of metal(iv) phosphonate hybrid adsorbent materials

Supplementary files

Article information


Submitted
05 May 2020
Accepted
10 Jul 2020
First published
11 Jul 2020

Phys. Chem. Chem. Phys., 2020,22, 17027-17032
Article type
Communication

New insights into the radiolytic stability of metal(IV) phosphonate hybrid adsorbent materials

V. Luca and J. Veliscek-Carolan, Phys. Chem. Chem. Phys., 2020, 22, 17027 DOI: 10.1039/D0CP02414G

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