N-contaning UiO-67 derived multifunctional hybrid materials as highly effective adsorbents for removal of Congo red

A post-synthetic approach using nitrogen-containing substances modify UiO-67 was proposed to enhance its adsorption for Congo red (CR). The newly synthesized materials were thoroughly analyzed by SEM, TEM, EDX, XPS, XRD, FT-IR, TGA and BET techniques. Results showed that N was successfully incorporated into UiO-67 frameworks to prepare of N X -UiO-67, through coordination interaction with Zr-O clusters. Compared to parent UiO-67, the obtained N X -UiO-67 exhibited a significant increase in adsorption of CR, and the adsorption capacities for CR were in the following order: N U -UiO-67 (2360 mg g −1 ) > N T -UiO-67 (1986.3 mg g −1 ) > N A -UiO-67 (1493 mg g −1 ). Moreover, the pseudo-second-order kinetics and the Langmuir isothermal model exhibited a better fit to describe the adsorption behavior of CR onto the N X -UiO-67.