Magnetic Functionalized Modified Amine Oxime Derivatives Of Calix [4] Arene And Its Application

Wastewater containing uranium would threaten human health and cause certain environmental security during the uranium mining and uranium hydrometallurgy process.Therefore,studies on the new method for waste-water containing uranium treatment,adsorbing uranium high efficient from the wastewater containing low concentration of uranium,have important strategic significance for uranium resource and harmful radiation protection.Calixarene derivatives and magnetic molecular technology are widely used in the treatment of uranium containing wastewater.This thesis is based on calix[4]arene easy functional modification and the best match between the diameter of hole and the diameter of UO₂²⁺.A magnetic functional adsorbent with good adsorption effect and good regeneration ability has been constructed.The adsorbent was studied by infrared spectrum（FTIR）,scanning electron microscopy（SEM）,ultraviolet spectroscopy（UV-Vis）,and adsorption desorption test and so on.The main contents and conclusions of this thesis are as follows:（1）p-tert-Butyl calix[4]arene was carried out of functional modification and used to preparation of the amidoxime calix arene.The influence of various factors on uranium adsorption was studied by controlling the single variable method and analyzed by means of FTIR and adsorption desorption experiments.Experimental results show that the optimum conditions of the amidoxime calix arene uranium adsorption temperature is 25 DEG C,the pH value is 4.5,the initial concentration of uranium is 20 mg/L,adsorbent dosage is 10 mg and adsorption time is 150 min,the adsorption rate was above 90%,the adsorption capacity is 44 mg/g.FTIR analysis show that the amidoxime calix arene structure did not change after the adsorption of uranium.Desorption experimental results showed that the desorption and regeneration after 8 times,the adsorption rate of uranium was above 70%.so the amidoxime calix arene has good regeneration performance.（2）Using amino modified magnetic Fe₃O₄ nanoparticles as a carrier,the amidoxime calix arene magnetic functional modification,magnetic functionalized modified amine oxime derivative material of calix[4]arene with solid conformation stability and matching with UO₂²⁺space configuration was prepared.The structure of magnetic functionalization material was characterized by FTIR and SEM.The influence of various factors on the adsorption of uranium was studied by controlling the single variable method.Meanwhile,the desorption experiment was carried out to investigate the regeneration performance.Experimental results show that the amine oxime derivatives of calix[4]arene is magnetic functionalized modified successfully,and it has a large specific surface area.The best condition for the adsorption of uranium is pH value is 3.5,the initial concentration of uranium is 40 mg/L,the dosage is 40 mg and the adsorption time is 3.5 h.The adsorption kinetic model and adsorption isotherm model was analyzed,shows that the magnetic functionalized modified amine oxime derivative material of calix[4]arene for uranium accords with the pseudo two order kinetics model,the adsorption isotherm accords with Langmuir isotherm model,the theoretical maximum adsorption capacity is 141.5 mg/g.Desorption experiments results showed that the desorption rate of uranium was over 80%after the desorption of magnetic functional material 6 times,indicating that the magnetic functional material has good application value.