Metal-organic framework containing both azo and amide groups for effective U(VI) removal

Uranium is not only a radioactive element but also an important nuclear-energy source. Thus the design of material for effective uranium adsorption is highly desirable from both environmental and energy considerations. In this work, a new azo-MOF was explored such use. It shows excellent U(VI) removal performance with the adsorption capacity up to 200 mg/g. The adsorption, as disclosed by the adsorption kinetics, is dominated by chemical adsorption, mainly due to coordination interaction between azo/amide and U(VI) ions. The results suggest that design of material with free-standing azo or amide groups benefits to U(VI) removal.