Carboxyl-functionalized UiO-66-NH2 for efficient capture of Th(IV) in aqueous solution: Experimental and DFT study

Decorating Cage-Shaped Cavities with Carboxyl Groups on Two-Dimensional MOF Nanosheet for Trace Uranium(VI) Trapping

“…Adsorption is considered to be one of the most promising methods to address water pollution, owing to the characteristics of low energy consumption, eco-friendliness, and cost-effectiveness . Traditional adsorbents, such as zeolites, clay, mesoporous carbon, and metals oxides, often suffer from slow adsorption kinetics, low adsorption selectivity, and capacities, which stems from their simple composition and lack of structural and functional tunability. ,− To achieve better adsorption performance for uranium, adsorbents with structural and functional tunability are highly desired, and adsorbent design with multiple factors should be considered, including surface area, porosity, and amount of adsorption sites. − Bearing this in mind, metal–organic frameworks (MOFs), a kind of crystalline hybrid porous material with a large surface area, densely populated chelating groups, and tunable pore structures, have been developed . The precisely designable and tailorable structures and components in MOFs are convenient to realize high performance in uranium extraction. − Amidoxime groups can be purposefully incorporated into UiO-66-NH-(AO) by a postsynthetic strategy, which showed good selectivity for uranium even in the presence of high concentrations of VO 2 2+ , Fe 3+ , Mg 2+ , Ca 2+ , and Zr 4+ .…”