Comparison of the Performance of AOP Method Using O3/H2O2 in the Presence of TiO2 and ZrO2 Nano Particles Stabilized on Pumice for the Removal of Pentachlorophenol from Aquatic Solution: Kinetic Studies

Pentachlorophenol is one of the resistant phenol compounds has classified in the group of the primary pollutants dueto its high toxicity and carcinogenic potential. The aim of this study is determining the efficiency of advancedoxidation process method using O3/H2O2 in the presence of TiO2 and ZrO2 nano-particles stabilized on pumice for theremoval of PCP from aquatic solutions. This experimental study was performed in a batch reactor at laboratory scale.In this study, the effects of reaction time, initial concentration of PCP, pH, concentration of catalysts and H2O2 andalso the amount of decline in chemical oxygen demand (COD) after the process were investigated. The concentrationof PCP in the sample was determined using spectrophotometer at wavelength of 500 nm and, in the end, the resultswere analyzed using SPSS software and according to repeated measures analysis and statistical test of comparativeordered pairs with confidence interval of 95%. Scanning electron microscope (SEM), fourier transform infraredspectroscopy (FTIR) and x-ray diffraction (XRD) images of modified pumice were taken and the kinetic degree of theprocesses was also determined. The results indicated that the PCP removal by the both processes increased withincreasing reaction time, catalyst concentration, H2O2 concentration and pH and reduced with decreasing initial PCPconcentration. The maximum removal efficiencies by the two processes: O3/nZrO2/H2O2 and O3/nTiO2/H2O2 were100 and 95%, respectively, in the optimum conditions. The results illustrated that the two studied processes followedthe pseudo-second -order kinetic model. Further, the findings revealed that the both processes mentioned in this study were of high capability in removing PCP and they could be used as an appropriate process in removing this organic material.

کلیدواژه ها:

Pentachlorophenol ، Advanced Oxidation ، Zirconium Dioxide Nano Particles ، Titanium Dioxide Nano Particles ، Pumce