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Shuao Wang1

1, Soochow University, Suzhou, , China

During the past three years, our group in Soochow University has deeply looked into two parallel research directions, both combining two fields of radiochemistry and metal-organic frameworks (MOFs). The first one is the synthesis and characterizations of actinide MOF compounds. This system is unique not only because compared to the transition metals and lanthanides, the actinide MOF systems are substantially less explored, but also that these compounds can not be simply predicted by those analogues of transition metals and lanthanides owing to the uniqueness of actinide ions in bonding and coordination. In addition, we have found many interesting potential applications for these compounds including actinide waste form design for geological disposal, ion-exchange for remediation of radioactive contamination, and detection of extremely low-dose ionization radiations, further highlighting the bright future of adopting actinide ions in building of unique MOFs with potential applications in the nuclear industry. The other research direction is the design and build of non-radioactive MOFs for rapid, efficient, and selective removal and detection of soluble radioisotope ions including UO22+, Sr2+, Cs+, and TcO4- from aqueous solutions. Specifically, I will talk about three interesting examples within this direction: several single-crystalline zirconium phosphonate MOFs that are able to survive from fuming acids including aqua regia and can remove large amounts of uranium even from acidic solutions; a luminescent mesoporous MOF equipped with abundant Lewis basic sites, which can be used for sequestration and detection of trace amounts of uranyl ion in the natural water systems including seawater; the first experimental investigation of 99TcO4- removal by a cationic MOF material showing many promises over the traditional anion-exchange materials. These works clearly reveal that all the possible advantages for ideal radioisotope sorbent materials including high capacity, fast kinetics, excellent selectivity, and great stability and recyclability etc. can be indeed integrated in the MOF system.

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