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Lumped-intermediates analysis in the photooxidation of Rhodamine 6G in the H_2O_2/UV system
Amaia Menendez,Jose I. Lombraña,Ana de Luis 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.2
The combination of H_2O_2 with UV radiation was applied to study the degradation of Rhodamine 6G dye (Rh-6G). The lumped kinetic model proposed in this work is a reaction-system scheme to describe the degradation of dye using lumps of intermediate compounds grouped by their chemical and colorimetric behavior. Rate constants obtained by application of the model were shown to predict the progress of dye oxidation. The effects of pH and oxidant dosage on these rate constants were also analyzed. Finally, photodecoloration was studied considering the absorption at 528 nm (the maximum absorption wavelength of the dye) as the sum of all compounds absorbing at this wavelength:Rhodamine itself and the colored intermediates produced.