Abstract:In order to reduce the gallic acid content of sugarcane juice and the color value of white granulated sugar，zirconia-modified zeolite was prepared using a co-precipitation method with zirconia and zeolite as raw materials.The surface structure of zeolite and group changes before and after modification were studied，and the effects of time，pH，temperature，and initial gallic acid concentration on the adsorption of gallic acid from sucrose solution using the modified zeolite were investigated.In addition，adsorption kinetics，isotherm models，and thermodynamics were discussed.Scanning electron microscope observations revealed that the surface of the modified zeolite was rougher than that of the unmodified compound，and the infrared spectrum obtained indicated group changes in the modified zeolite and the successful loading of zirconia.The adsorption capacity of zirconium-modified zeolite for gallic acid was found to be 34.442 mg/g，whereas the optimum pH and time for modified zeolite adsorption of gallic acid from sucrose solution were 8.0 and 600 min，respectively.Furthermore，it was found that increasing the adsorption temperature and initial concentration of gallic acid was beneficial with respect to enhancing the adsorption effect，and that the adsorption process could be described in terms of quasi-second-order adsorption kinetic and Langmuir isothermal adsorption models，whereas thermodynamic analysis revealed that the adsorption process was endothermic and could be spontaneous.