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This research aimed to assess the degradation the Indigo Carmine dye via photo-Fenton process. Applying a Response Surface Methodology the best experimental conditions of initial pH (2.5 3.4), [H2O2] (29.5 130.5 mg L ) and [Fe] (13.2 40.0 mg L were investigated. Reductions of absorbance in the wavelengths corresponding to the absorption peaks of the dye were analyzed to verify the process efficiency. The best performance of the photo-Fenton process was observed in initial pH 2.8, initial concentrations of 29.5 mg H2O2 L -1 and 13,2 mg Fe L, obtaining absorbance reduction of 74, 98, 85 and 100%, in 120 minutes for the wavelengths 254 nm, 284 nm, 310 nm and 610 nm, respectively. These results indicated a significant degradation of the dye, observed especially in the spectrum region of the its chromophore group (610 nm). However, bioassays using Lactuca sativa showed an increase in the toxicity of the Indigo Carmine dye solution, suggesting the formation of more toxic intermediary compounds. Therefore, it is necessary to integrate a complementary process to photo-Fenton in order to reduce the toxicity of the Indigo Carmine dye, minimizing the environmental impacts caused by the inappropriate discharge of these compounds into water bodies.

Investigação da Toxicidade Aguda (Lactuca sativa) e da Degradação do Corante Índigo Carmim pelo Processo de Oxidação Foto-Fenton