One‐Pot Synthesis of Magnetically Recyclable Fe₃o₄@Uio‐66 Composite with Enhanced Oxytetracycline Adsorption Capacity

Abstract As one of the most stable metal‐organic frame materials (MOFs), UiO‐66 has attracted extensive attention in the adsorption field. However, the application of UiO‐66 is still constrained by the weak electron‐hole charge separation capability and the low accessibility of micropores. In this study, the mesoporous defects of UiO‐66 were constructed with acetic acid and doped with Fe 3 O 4 to prepare magnetically recyclable Fe 3 O 4 @UiO‐66. The doping of Fe 3 O 4 resulted in the formation of denatured mesoporous defects in UiO‐66, which was conducive to adsorption oxytetracycline (OTC) in water. The crystal structure and physicochemical characteristics of Fe 3 O 4 @UiO‐66 were examined. By using the static adsorption technique, the adsorption characteristics and mechanism of OTC on Fe 3 O 4 @UiO‐66 were investigated. The results reveal that Fe 3 O 4 @UiO‐66 has an adsorption capacity of 210 mg g −1 and an OTC removal ratio of 84.0%. The pseudo‐second‐order kinetics, Elovich, and Langmuir isothermal adsorption models were all applicable to the adsorption process. The adsorption process increased entropy and was an endothermic reaction. Solution pH has a little effect on the adsorption performance. This study provides the possibility of one‐step synthesis of MOFs that can efficiently adsorb tetracycline antibiotics in water with low cost and excellent recyclability and reusablity.