Efficient removal of Pb 2+ from water using Fe 3 O 4 @UiO-66-NH 2 core/shell nanocomposite

Using solvothermal method to combine Amino-functionalized metal–organic frameworks (MOFs) with magnetite (Fe 3 O 4 NPS), and the generated magnetic nanocomposite dispersed in MOFs precursor in a row, generating two assembly cycles Fe 3 O 4 @UiO-66-NH 2 core/shell nanocomposite for efficient removal of Pb 2+ from aqueous solution. The nanocomposite was characterized by X-ray diffraction (XRD), fourier transform infrared spectra (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption-desorption and vibrating sample magnetometer (VSM). Compare the adsorption performance of primary and secondary growth. Batch experiments show that the secondary magnetization of Fe 3 O 4 @UiO-66-NH 2 -2 core/shell nanocomposite has a good removal effect on Pb 2+. The prepared Fe 3 O 4 @UiO-66-NH 2 -2 core/shell nanocomposite showed excellent efficient removal of Pb 2+ with high adsorption capacity (q e : 19.8 mg·g –1, c 0 : 5 mg·L –1 ) and rapid separation from water by an external magnetic field because of the efficient combination of the advantages of UiO-66-NH 2 and the Fe 3 O 4 NPS. The adsorption mechanism is mainly confirmed by the coordination interaction between amino (-NH 2 ) and Pb 2+. These results proved that the preparation of Fe 3 O 4 @UiO-66-NH 2 -2 core/shell nanocomposite can be used as an efficient, separable adsorbent to adsorb Pb 2+ contaminants in water.