Magnetic Functionalized Modified Amine Oxime Derivative of Calix4 Arene and Its Adsorption Property for Uranium

Using amino modified magnetic Fe₃O₄ nanoparticles as carrier, a novel magnetic functionalization material (MFM-AOCA) with very stable three-dimensional conformation and matching with UO²⁺₂ space configuration was obtained through magnetic functionalized modified amine oxime derivatives of calix4 arene. The structure of MFM-AOCA was characterized by FT-IR and SEM. The effects of pH, initial concentration of uranium, MFM-AOCA dosage and adsorption time on the adsorption of uranium on MFM-AOCA were investigated. The results show that the amine oxime derivatives of calix4 arene is magnetic functionalized modified successfully, and it has a large specific surface area. The best condition for the adsorption of uranium on MFM-AOCA is that pH=3.5, the initial concentration of uranium is 40 mg/L, the MFM-AOCA dosage is 40 mg and the adsorption time is 3.5 h. The adsorption kinetic model and isotherm model of MFM-AOCA were studied. The kinetic model of MFM-AOCA can be described by the pseudo-second-order model well, and its correlation coefficient is above 0.99. The isotherm model is fitted to Langmuir adsorption model, and the maximal theoretical adsorption capacity is 141.28 mg/g. In addition, MFM-AOCA has good regeneration performance, because the adsorption rate is over 80% after regenerated 6 times with 3 different desorption agents.