| Autor: |
Gonzaga dos Santos Júnior, Sérgio1, da Rocha Santana, Rayany Magali1, de Mendonça Gomes, Rayssa Kelen1, Santos de Moraes, Nathália Farias1, Michelle da Silva, Pollyanna2, Guedes Paiva, Patrícia Maria2, Andrade de Lucena, Alex Leandro1, Elisandra do Nascimento, Graziele1, Carla Napoleão, Daniella1 daniella.napoleao@ufe.br |
| Předmět: |
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| Zdroj: |
Environmental Engineering & Management Journal (EEMJ). Jun2021, Vol. 20 Issue 6, p883-893. 11p. |
| Abstrakt: |
The treatment of persistent pollutants in water is a subject of numerous researches around the world. In the present work, the degradation of a mixture of textile dyes by the photo-Fenton process was investigated. This was conducted under LED radiation, which has a reduced cost, employing iron in salt and residue forms. For homogeneous and heterogeneous processes, in acid medium, the effects of the H2O2 and iron concentrations were evaluated. The tests demonstrated that the homogeneous process was better conducted using 100 mg.L-1 of H2O2 and 2.0 mg.L-1 of iron, with 98% of degradation. For the heterogeneous study, H2O2 and iron residue concentrations of 100 mg.L-1 and 0.5 g.L-1, respectively, were used, obtaining a 92% of degradation. The residue used was characterized by FTIR analysis. Peaks related to the presence of Fe were observed. The kinetics of the processes were evaluated, with good adjustments to non-linear models of pseudo-first order, attaining values of linear regression greater than 0.94. Toxicity tests were carried out with seeds and bacteria. It was observed a possible formation of intermediates due to the increased toxicity for the solution treated by the heterogeneous process. Artificial neural networks were used to accurately predict the degradation of the dye mixture. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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