Research Of Sorption Iodate By Using Large Particle

Radioactive iodine would cause a serious hazard to human health as their high toxicity and mobility in the environment.Iodate is one of the major species of iodine in the environment and an impoitant by-product of industrial disinfection.It is also recommended as an additive to salt for correcting iodine deficiency.From the perspectives of public health and environmental protection,removing IO₃^- from aqueous solutions is of significant importance.Al₂O₃ Is a popular sorption material.Metal coating of Al₂O₃ could improve its sorption ability for some specific pollutants.Copper was coated on the large particle Al₂O₃.The sorption of IO₃^- by Cu-Al₂O₃,Fe-Al₂O₃ and Al₂O₃ needs 70 hours to reach the sorption equilibrium with a K_d of 102,92 and 38 mL/g respectively.The sorption kinetics follows the pseudosecond-order model.The K_d decreases while the initial concentration of IO₃^-increases from 5 to 120 ppm.The isotherm Is well described by the Freundlich model.When temperature increases,the K_d decreases,so the sorption process is a nonspontaneous and endothermic reaction.Under acid conditions,the sorption of IO₃^- is improved.The maximum Kd in this work is 102,92 and 38 mL/g respectively.Cu-Al₂O₃ Could be used to separate IO₃^- pollution in the solution for its best sorption ability and convenience of separation.