Preparation Of Magnetic Functionalized Modifiedcalix[4] Arene Derivatives And Their Separation And Enrichment Towards Uranium(?)

With the development of society,people's demand for energy is increasing.As a clean and efficient energy,nuclear energy is valued by countries all over the world.Uranium is the main fuel of nuclear power,the development of uranium resources must be intensified,but a large amount of radioactive uranium-containing wastewater will be produced during the nuclear fuel cycle.If not properly handled,it will cause great harm to the earth's environment and human health.If the uranium in this wastewater can be separated and enriched,it can not only protect the environment but also recycle the precious uranium resources.Therefore,it is of great significance to study new functional materials to treat uranium-containing wastewater.Based on the spatial configuration of calix[4]arene is the best match with the size of uranyl ions,the upper and lower rims of calix[4]arene were modified and grafted onto magnetic Fe₃O₄ nanoparticles to achieve efficient separation of uranium.The main research contents and conclusions of this paper are as follows.?1?Calix[4]arene phosphatederivative and calix[4]arene amidoxime derivative were synthesized by modification on the lower rim of calix[4]arene,and characterized by infrared spectroscopy.By studying the adsorption properties of these two substances on uranium,it is found that calix[4]arene phosphate derivative are more suitable for uranium adsorption than calix[4]arene amidoxime derivative.?2?The carboxylated calix[4]arene phosphate derivativewas synthesized by carboxylating the upperrim of the calix[4]arene phosphate derivative,and characterized by FT-IR and NMR.By studying the extraction and adsorption performance of carboxylated calix[4]arene phosphate derivative on uranium,it was found that its adsorption effect on uranium was better than its extraction effect.?3?The carboxylated calix[4]arene phosphate derivativewas grafted onto the magnetic Fe₃O₄ nanoparticle,and the magnetic Fe₃O₄/CCP composite materialwas prepared,which was characterized by infrared spectroscopy,XRD and scanning electron microscopy.By researching the adsorption performance and mechanism of Fe₃O₄/CCP on uranium,it is found that Fe₃O₄/CCP has a good selective adsorption ability on uranium and good regeneration performance.?4?The magnetic Fe₃O₄/CCP composite material has good selective recognition ability for uranium,good reusability,and high adsorption rate for uranium bearing wastewater and easy realization of process parameters in industrial production,which shows that Fe₃O₄/CCP has a good application prospect in uranium bearing wastewater treatment.