Magnetic photocatalysts based on graphene oxide: synthesis, characterization, application in advanced oxidation processes and response surface analysis

Abstract The decomposition rate of methyl orange (MO) is studied in aqueous solution magnetic photocatalysts based on graphene oxide (GO). ZnO photocatalytic nanoparticles are synthesized with controlled amounts magnetized and two samples including GFZ1 GFZ2 prepared for use advanced oxidation process. characterization the done by XRD, FTIR VSM. crystal structure Fe 3 O 4 as well network has been confirmed XRD analysis both samples. also shows stretching vibration Fe–O Zn–O bonds ZnO, respectively. superparamagnetic properties can be using VSM analysis. It observed that increase GFZ2, decrease compared to GFZ1. effect irradiation time (between 5 40 min), weight fraction (0.1%wt, 0.2%wt, 0.3%wt) pH suspension (3, 7, 11) changes MO was investigated response surface method (RSM) used study simultaneous change parameters mentioned factors removal efficiency. results show photocatalysts, increases significantly. So all intervals fractions, activity much higher than maximum minimum rates occur acidic neutral conditions,