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- Title
Kinetic and ecotoxicological evaluation of the direct orange 26 dye degradation by Fenton and solar photo-Fenton processes.
- Authors
da Rocha Santana, Rayany Magali; do Nascimento, Graziele Elisandra; de Aguiar Silva, Polyana Karynne; de Lucena, Alex Leandro Andrade; Procópio, Thamara Figueiredo; Napoleão, Thiago Henrique; Bezerra Duarte, Marta Maria Menezes; Napoleão, Daniella Carla
- Abstract
The presence of color in textile effluents has been studied because of the need for more effective treatments. Therefore, advanced oxidative processes (AOP) have been used in the degradation of dyes, as well as in the conversion of organic matter. This study evaluated the degradation of the direct orange 26 textile dye by Fenton and photo-Fenton processes (with natural solar radiation). A statistical analysis, based on factorial 23 indicated the best working conditions, being: [H2O2] = 100 mg·L-1 and pH 3-4, for both AOP in that the [Fe] = 1 e 5 mg·L-1, for photo-Fenton and Fenton, respectively. The results of the kinetic studies demonstrated a good fit to the nonlinear kinetic model proposed by Chan and Chu, with values of R² > 0,996 (photo-fenton) and R² > 0,939 (Fenton). The tests performed to evaluate the chemical oxygen demand indicated conversions of 62.05% (Fenton) and 66.41% (photo-Fenton). Finally, the ecotoxicity study indicated that the post-treatment samples were non-toxic to the bacteria Escherichia coli and Proteus mirabilis but showed growth inhibition for Lactuca sativa (Fenton and photo-Fenton) seeds and for Brassica juncea and Portulaca grandiflora (Fenton).
- Publication
Revista Eletrônica em Gestão, Educação e Tecnologia Ambiental, 2018, Vol 22, Issue 1, p1
- ISSN
2236-1170
- Publication type
Article
- DOI
10.5902/2236117032254