Unique porous framework constructed by uranyl phosphonate with high structural stability and preferential ion exchange capacity

The stable porous material capable of exchanging external ions has promising potential in sorption and separation for radioactive nuclides. Herein, an in situ hydrothermal synthesis successfully incorporates potassium ions into a three-dimensional anionic uranyl phosphonate framework ( UPF , 1 ), which endows the porous framework with a particular ion-exchange capacity towards alkali and alkali earth ions. Remarkably, framework 1 is tolerant to high temperature, acidity, and salinity, presenting high stability and thus allowing applications in multiple scenarios with harsh conditions. Graphical abstract