Fe₃O₄-SiO₂-recognition Of Ligands Magnetic Composite Materials For Adsorption Separation Of U（Ⅵ）

The purpose of the topics to uranyl ion separation and extraction’s waste ofnuclear. It is coated on the surface of the functionalized ligands as a carrier of SiO2（Fe3O4/SiO2） magnetic nanoparticles.Preparation of uranyl ion with good selectivityand high adsorption rate of magnetic composite materials,the character of it is themagnetic composite materials are easily separated from the solution in the externalmagnetic field,it is with good selectivity and good adsorption rate at the sametime.This research is mainly done the following several aspects.1.Synthesized two Fe₃O₄-SiO₂-recognition of ligands magnetic composites,First,Amino-modified magnetic Fe₃O₄/SiO₂composite materials （APFS） were obtainedthrough adding SiO2and APTES into Fe3O4nanoparticles,Second,the surface ofmagnetic nanoparticle was modified by TEOS and diethyl chlorophosphate insequence; we have successfully prepared composite particle phosphate esterificationFe₃O₄/SiO₂（DCFS）.2.The structure of Fe₃O₄-SiO₂-recognition of ligands magnetic composite materialswere characterized by infrared absorption spectrum （IR） and vibrating specimenmagnetometer（VSM） and Hot integrated analyzer（TGA） and The X-ray dif-fraction（XRD），the results indicate that the size and the saturation magnetization of APFSwere500nm and26.54emu/g,IR, TGA,XRD analysis showed that the aminofunctional group has been successfully connected to the surface of Fe₃O₄/SiO₂,Theresults indicate that the size and the saturation magnetization of DCFS were500nmand21.7emu/g.IR,IR,TGA analysis showed that the phosphate group has beensuccessfully connected to the surface of Fe₃O₄/SiO₂.3. Two Fe₃O₄-SiO₂-recognition of ligands magnetic composites are studied foradsorption U（VI） in simulated nuclear wastewater. Spectrophotometry is used tostudy composite materials static adsorption behavior of uranium in water,and temperature, pH value, adsorption time solution,the amount of adsorbent of influenceof adsorption rate are inspected，The best APFS adsorption conditions were as follows:the adsorbent used in an amount of0.1g,adsorption temperature of35°C; adsorptiontime of30min, pH=4.5,on uranyl ion equilibrium adsorption rate of98.57%；Thebest DCFS adsorption conditions were as follows: the adsorbent used in an amount of0.1g,adsorption temperature of45°C; adsorption time of20min, pH=5.5, on uranylion equilibrium adsorption rate of96.4%.Experiments show that two Fe₃O₄-SiO₂-recognition of ligands magneticcomposites are a large absorption capacity, competition and selective separation ofU（VI）,The method is a quick and easy and the particles can be easily enrichment andrecovery in an efficient and selective adsorbent after adsorption, the magnetic, whichproviding a possibility for industrial wastewater treatment.