Degradation of reactive azo dye by UV/peroxodisulfate system: an experimental design approach
- 120 Downloads
In the present study, UV and UV/S2O8 2− have been applied to decolorize and mineralize organic dye C. I. Reactive Red 45 (RR 45) in aqueous solution. The rate of color removal was studied by measuring the absorbance at the characteristic wavelength while mineralization rates were obtained on the basis of total organic carbon (TOC). A statistical study of the process was performed using an experimental design method, particularly a response surface methodology (RSM) hexagonal design. Optimal operating conditions were established; pH 5 to pH 7 and [K2S2O8] = 15 mM. A complete color removal was achieved in all studied combinations of process parameters, while almost complete mineralization can be achieved at established optimal process conditions. According to the developed statistical model of the process and performed kinetic study, experimental data were fitted into a model of homogeneous system.
KeywordsOrganic azo dye AOPs UV/S2O82− Experimental design Total organic carbon Decolorization
We would like to acknowledge financial support from the Ministry of Science, Education and Sport, Republic of Croatia. We are also grateful to dr Ana Loncaric Bozic for useful comments about this study.
- 12.Myers RH, Montgomery DC (2002) Response surface methodology. process and products optimization using designed experiments. Wiley, New YorkGoogle Scholar
- 18.Peternel I, Lončarić Božić A, Koprivanac N, Flamaceta M (2009) Degradation of C.I. Reactive Red 45 by UV-S2O8 2− system-optimization of key operational parameters. In: Progress in environmental science and technology, vol 2, part B. Science Press, Beijing, pp 1093–1098Google Scholar
- 19.Connors KA (1990) Chemical kinetics: the study of reaction rates in solution. Wiley, New YorkGoogle Scholar
- 21.Horia H, Yamamotoa A, Koikea K, Kutsunaa S, Osakab I, Arakawab R (2007) Persulfate-induced photochemical decomposition of a fluorotelomer unsaturated carboxylic acid in water. Water Res 41:2961–2968Google Scholar
- 22.Salari D, Niaei A, Aber S, Rasoulifard MH (2009) The photooxidative destruction of C.I. Basic Yellow 2 using UV/S2O8 process in a rectangular continuous photoreactor. J Hazard Mater (corrected proof)Google Scholar