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Synthesis of ordered mesoporous uranium dioxide by a nanocasting route

Radiochimica Acta, ISSN: 0033-8230, Vol: 104, Issue: 8, Page: 549-553
2016
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Ordered mesoporous UO with 3-D structure (for UO-KIT-6) and nanowire bundles (for UO-SBA-15) was synthesized for the first time by a nanocasting route using different ordered mesoporous silica (KIT-6 and SBA-15, respectively) as templates and uranyl nitrate hexahydrate as the metal precursor. The uranyl nitrate was impregnated into the mesopore of the silica template and was converted to UO after the first step. The synthesis of ordered UO mesostructure was achieved by reducing the mesoporous UO with silica composites under 5% H/Ar atmosphere at 700°C, followed by a template removal process. The as-prepared UO-KIT-6 had a particle size of several millimeters, and was constructed with uncoupled subframework mesostructure and crystalline walls, while UO-SBA-15 possessed a rope-like morphology and consisted of nanowire arrays. The surface area and pore volume of ordered UO mesostructure are 47.2 m g and 0.23 cm g for the UO-KIT-6, and 54.4 m g and 0.28 cm g for the UO-SBA-15, respectively.

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