Adsorption of 2,4-dichlorophenoxyacetic acid by UiO-66-NH2 obtained in a green way

In this study, a zirconium elemental organic framework (UiO-66-NH 2 ) was prepared by a green synthesis method and showed a good adsorption performance for removing 2,4-dichlorophenoxyacetic acid (2,4-D) from water. UiO-66-NH 2 was analyzed by a variety of characterization methods and the adsorption properties of 2,4-D on UiO-66-NH 2 were investigated by static adsorption experiments. The results showed that the adsorption of 2,4-D had a wide pH range (2–10) and good salt tolerance with the adsorption equilibrium time about 2 h. The maximum adsorption capacity from Langmuir was up to 652 mg g −1 at 303 K. The isotherms can be described by Langmuir model and the adsorption kinetics was consistent with pseudo-second-order kinetic model and Elovich model. The regeneration efficiency was still 95% after 5 cycles with 0.01 mol L −1 NaOH as desorption solution. The feasibility of practical application of UiO-66-NH 2 was explored by simulating actual wastewater at different pH. UiO-66-NH 2 is promising to remove 2,4-D from water. Graphical abstract