Optimization of imazalil removal in the system UV/TiO2/K2S2O8 using a response surface methodology (RSM)

► K2S2O8 was used as electron scavenger to accelerate the degradation rate of imazalil. ► The photocatalytic degradation of imazalil was optimized in the system UV/TiO2/K2S2O8. ► An experimental design was used to accomplish this optimization. ► For the low concentration of imazalil, acidic pH, 2.5 g L−1of persulfate and 2.5 g L−1 of TiO2, give the faster removal time.