A (3,12)-connected metal-organic framework based on hexanuclear zinc cluster for iodine capture
Journal of Solid State Chemistry(2024)
Abstract
The adsorption of discharged radioactive iodine is considered an important method to address this environmental problem. Metal-organic framework (MOF) materials are expected to be potential materials for capturing iodine. In this work, a new zinc-based MOF, namely [Zn6(OH)6(DMTDC)3(TPB)]·0.5DMF (JOU-31), was successfully prepared under solvothermal condition (H2DMTDC = 3,4-dimethylthieno[2,3-b]thiophene-2,5-dicarboxylic acid, TPB = 1,3,5-tris(4-pyridyl)benzene, DMF = N,N-Dimethylformamide). Structural analyses revealed that JOU-31 was a three-dimensional porous structure based on hexanuclear zinc-oxide clusters. Topologically, the framework of JOU-31 can be simplified to a (3,12)-connected net with new Schläfli symbol of {43·630}{43}2. Due to its large specific surface area, abundant electron-rich N/S sites, and high stability, JOU-31 was applied to capture iodine. The saturated iodine adsorption capacity of JOU-31 in n-hexane solution was 822 mg g-1. In addition, the interaction mechanism between JOU-31 and the adsorbed iodine was further explored in detail. This work provides a valuable clue for the preparation of new MOFs for iodine adsorption.
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Key words
Metal-organic framework,Iodine capture,Zinc-oxide cluster,Topology
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