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Report No.

Synthesis, structure, and cesium uptake properties of novel rare earth organic frameworks

Nankawa, Takuya ; Ogoshi, Yurie

Removal of cesium by porous materials from various environments has recently attracted much attention because of the Fukushima crisis. Among the porous materials, Prussian-blue has so high Cs selectivity that they can be used even in the sea water. But because they had a possibility to generate HCN gas by the radioactive decomposition, they were not used in Fukushima. We synthesized novel rare earth organic framework with the formula of Re(NH$$_{4}$$)(C$$_{2}$$O$$_{4}$$)$$_{2}$$(H$$_{2}$$O) (Re = Y, Eu, Tb, Dy, Ho, Er) by modifying the pores of Prussian blue. We used single crystal X-ray diffraction analysis to determine the molecular structures of Tb(NH$$_{4}$$)(C$$_{2}$$O$$_{4}$$)$$_{2}$$(H$$_{2}$$O). The diameter of the pore around NH4 is about the same size with the pores of Prussian blue. And it was revealed that the structures of MOFs are isostructural and their pore sizes of are precisely controlled by changing lanthanide ions. We demonstrated Cs uptake experiment in water solution and revealed that Cs was uptaken by the MOFs.



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