Sorption of U(VI) on Schiff-base functionalized metal-organic frameworks UiO-66-NH2

A metal-organic framework, UiO-66-NH2, was designed, synthesized and characterized in this study. By conducting solvothermal method, Salicylaldehyde (Sal) and 2,4-dihydroxybenzaldehyde (MHBA) were grafted onto UiO-66-NH2 via post-treatment to obtain the functionalized material UiO-66-Sal and UiO-66-MHBA. The three materials above were characterized, and the effects of solid-liquid ratio, pH, ionic strength, and oscillation time on U(VI) adsorption were studied. The relevant experimental results fitted well with pseudo-second-order kinetic equation and thermodynamic adsorption model.

Automated summary

In this study, a metal-organic framework, UiO-66-NH2, was designed, synthesized and characterized. Functionalized materials UiO-66-Sal and UiO-66-MHBA were obtained by grafting Salicylaldehyde and 2,4-dihydroxybenzaldehyde onto UiO-66-NH2 via post-treatment. The effects of various factors on U(VI) adsorption were studied, with experimental results fitting well with pseudo-second-order kinetic equation and thermodynamic adsorption model.