Aplicação do processo foto-fenton na degradação do corante índigo carmin

Abstract

This work aimed to evaluate a degradation of Indigo Carmine dye (CIC) through the photo- Fenton process. From a response methodology (MSR) the best process conditions were investigated, such as: initial pH (2,5 - 3,5), concentration of H 2 O 2 (29,5 - 130,5 mg L -1 ) and concentration of Fe II (13,2 - 40 mg L -1 ). To verify the efficiency of the wavelength of 228 nm, 254 nm, 284 nm, 310 nm and 610 nm. The best performance of the photo-Fenton process was observed at pH 2,8, concentration of 29,5 mg H 2 O 2 L -1 and 13,2 mg Fe II L -1 , obtaining a reduction of 74,2, 97,5, 85, 3 and 100% in 120 minutes for the lengths of 254 nm, 284 nm, 310 nm and 610 nm, respectively. Bioassays using Lactuca sativa indicated an increase in toxicity of solution (CIC) after the photo-Fenton process. However, an integration of a final polishing process for a reduction of the toxicity of the CIC treated by the photo-Fenton process is suggested.