Author/Authors :
Mohammadi، Leili نويسنده Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran , , Bazrafshan، Edris نويسنده Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran , , Noroozifar، Meissam نويسنده Analytical Research Laboratory, Department of Chemistry, University of Sistan and Baluchestan, Zahedan, IR Iran , , Ansari-Moghaddam، Alireza نويسنده Department of Epidemiology and Biostatistics, Health Promotion Research Center, Faculty of Health, Zahedan University of Medical Sciences, Zahedan Ansari-Moghaddam, Alireza
Abstract :
Volatile organic compounds (VOCs) removal like toluene is an important concern for health of humans and the environment. In this study, the efficiency of heterogeneous catalytic ozonation process (COP) with MgO nanoparticles for toluene degradation in aqueous solutions was investigated. Response surface methodology (RSM) using central composite design (CCD) was applied to study the interactions between critical operating factors and to find their optimum levels. Four independent factors namely pH, catalyst dosage, ozonation time and concentration of toluene were transformed to coded values and consequently a second order quadratic model was prepared for responses prediction. The analysis of variance (ANOVA) of the toluene degradation by COP/MgO nanoparticles showed F-value of 19.53 for the quadratic model indicating that the prepared model is significant. The predicted result showed that maximum degradation of toluene (~99.99%) could be achieved at pH 12, MgO dose 0.5 g, ozonation time of 50 minutes and initial toluene concentration of 10 mg/l. The correlation coefficient (R2 = 0.9480) indicates a good correlation between the experimental and predicted values. According to the results, COP is an efficient and rapid method for removing of toluene from aqueous solutions.
