Abstract:Magnetic zirconium-loaded kaolin was prepared using the coprecipitation method and used to remove caffeic acid from a sucrose solution.The surface structure and changes in chemical groups of kaolin before and after modification were characterized using Fourier infrared spectroscopy（FTIR），vibrating sample magnetometer（VSM），and scanning electron microscopy（SEM），and the adsorption characteristics of kaolin toward caffeic acid were studied.The results showed that the modified zirconia and Fe3O4were successfully loaded onto the kaolin and improved its adsorption capacity toward caffeic acid.The isoelectric point of magnetic zirconia-loaded kaolin was 3.49.The acidic conditions were conducive to the removal of caffeic acid，and the adsorption equilibrium was reached in 180 min.The adsorption process of caffeic acid by magnetic zirconium-loaded kaolin was similar to the pseudo-second-order kinetic and Langmuir isotherm adsorption models.The process was mainly chemical and monolayer adsorption，and a thermodynamic study showed that this was a spontaneous endothermic process.A regeneration performance experiment showed that the regeneration times of magnetic zirconium-loaded kaolin should be controllable after three repeats.