abstract
To efficiently capture the toxic uranyl ions (UO22+), a new hierarchical micro-macroporous metal-organic framework was prepared under template-free conditions, featuring interconnected multi-nanocages bearing carbonyl groups derived from a semi-rigid ligand. The material exhibits an unusually high UO22+ sorption capacity of 562 mg g(-1), which occurs in an intriguing two-steps process, on the macropore-based crystal surface and in the inner nanocages. Notably, the latter is attributed to the cooperative interplay of the shrinkage of the host porous framework induced by uranyl accommodation and the free carbonyl coordination sites, as shown by both single-crystal X-ray diffraction and a red-shift of the infrared [O=U-VI=O](2+) antisymmetric vibration band.
keywords
METAL-IONS; URANIUM; REMOVAL; SORPTION; ADSORPTION; EXTRACTION; SURFACES; RECOVERY; MODEL; CAGES
subject category
Chemistry
authors
Wang, XF; Chen, YY; Song, LP; Fang, Z; Zhang, J; Shi, FN; Lin, YW; Sun, YK; Zhang, YB; Rocha, J
our authors
João Rocha
Directoracknowledgements
This work was financially supported by the National Science Foundation of China (11375082), and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry (to Dr. X.-F.W.). This work was developed in the scope of the project CICECO-Aveiro Institute of Materials (FCT Ref. UID/CTM/50011/2019), financed by national funds through FCT/MEC.