Demonstration of Iodine Removal Efficiency of Mof-74 and Uio-66 from Nuclear Waste Solutions in the Presence of Interfering Ions

Alghamdi, Turki; Aina, Peter O.; Rownaghi, Ali A.; Rezaei, Fateme

doi:10.2139/ssrn.4306062

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“…10−12 The octahedral UiO-66-NH 2 has one of the highest iodine adsorption capacities of up to 18.45 wt % coordinated by the high surface energy and the bond formation between the Zr and iodine. 13 In our previous work, 11 we demonstrated the efficacy of Zr-UiO-66 in immobilizing iodine from aqueous solution under various temperature and feed concentrations. Moreover, Al 2 O 3 -based adsorbents have been shown to display low leach rates.…”

Section: Introductionmentioning

confidence: 97%

Consolidation of Iodine-Laden Adsorbents into Cementitious Waste Forms Suitable for Geological Disposal

Alghamdi,

Mondal,

Aina

et al. 2024

ACS Appl. Eng. Mater.

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Formulation of iodine-laden materials into waste forms suitable for permanent geological disposal is a daunting challenge. In this work, we present a feasible method for incorporating iodine-loaded UiO-66-NH 2 and Al 2 O 3 -DMAPS (3-N,Ndimethylaminopropyl-trimethoxysilane) adsorbents into low-calcium alkaline cement (type III) to produce consolidated waste forms. The UiO-66-NH 2 and Al 2 O 3 -DMAPS adsorbents exhibited 248 and 241 mg/g iodine capacity, respectively, upon exposure to iodine in aqueous phase at 25 °C for 48 h. After incorporation into cement matrix, the consolidated waste forms were characterized by X-ray photoelectron spectrometry (XPS), X-ray diffraction (XRD), and X-ray computed tomography (XCT). The results confirmed the presence of crystalline phases and uniform distribution of iodine-laden adsorbents within the cement matrix. Additionally, the effect of adsorbents loading on the mechanical integrity of the composites was investigated, and the results showed that the total porosity correlated strongly with the compressive strength. However, as the iodine-adsorbent/cement weight ratio increased, the compressive strength decreased, which also reduced the thermal stability of the composite. Lastly, the iodine leaching tests in deionized water confirmed the efficacy of the cementitious waste forms in permanently trapping iodine for safe geological disposal.

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Section: Introductionmentioning

confidence: 97%