The Kinetic of Decolorizing Reactive Orange 122 (RO122) by Peracetic Acid in the Presence of Metal ions and UV Light

Abstract

Abstract: The kinetic of decolorizing Reactive Orange 122 (RO122) by peracetic acid (PAA) in the presence of metal ionsand UV light at 24 ± 1oChas been studied in this research. All experiments were conducted in a 500 mL reactor in which concentrations of peracetic acid were applied in large excess comparingto reactive orange 122. Four metal ions were tested for catalytic activity including Mn2+, Cu2+, Co2+, and Fe3+. The effects of metal ion concentration and pH were evaluated for the ion having the highest activity. Conbination of PAA and UV light was also tested.In this study, the variation of the dye concentration was monitored by measuring light absorption at the maximum absorption wavelength of Reactive Orange 122 (at 493 nm). The obtained results showed that Co2+ion has the highest catalytic activity. The rate of decolorization increases as the concentration of Co2+ and pH increases. Under UV light irradiation, PAA exhibited higher activity comparing to H2O2. This phenomenon can be explained by weaker O-O linkage in PAA.
 Keywords
 Peracetic acid, reactive orange 122, kinetics, UV light.
 References
 [1] P. Krizman , F. Kovac, P. F. Tavcer, Bleaching of cotton fabric with peracetic acid in the presence of different activators, Color. Technol. 121 (2005) 304 - 309.[2] D. P. Barros, V. L. Silva, H. Hamalainen, J. L. Colodette, Effect of last stage bleaching with peracetic acid on brightness development and properties of eucalyptus pulp, Bioresource 5 (2) (2010) 881 - 898.[3] D. S. R. Gehr, T. A. Bartrand, L. Liberti, M. Notarnicola, A. Dell’Erba, D. Falsanisi, C. N. Haas, Wastewater Disinfection by Peracetic Acid:Assessment of Models for Tracking Residual Measurements and Inactivation, Water Environment Research 79 (7) (2007) 775 - 787. [4] M. Kitis, Disinfection of wastewater with peraceticacid: a review, Environment International 30 (2004) 47–55.[5] S. Bonetta, C. Pignata, E. Lorenzi, M. D. Ceglia,L. M., S. Bonetta, G. Gilli, E. Carraro, Peracetic Acid (PAA) Disinfection: Inactivation ofMicrobial Indicators and Pathogenic Bacteria ina Municipal Wastewater Plant, Water 9 (2017) 427 https://doi.org/10.3390/w9060427.[6] R. D. Bach, P. Y. Ayala, H. B. Schlegel, A Reassessment of the Bond Dissociation Energies ofPeroxides. An ab Initio Study, J. Am. Chem. Soc. 118 (1996) 12758-12765.[7] H. M. N. H. IrvingR. J. P. Williams, The stability of transition-metal complexes, J. Chem. Soc. (1953) 3192