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<p>The development of catalysts often turns out to be a slow and expensive process from which small quantities of material are obtained, therefore, the search for economical and environmentally friendly materials is relevant. In this work, the use of FeSO<sub>4</sub> waste generated in the steel industry as a catalyst in a homogeneous Fenton process for the individual and mixed decolorization of the dyes Methyl Orange (MO) and Rhodamine B (RhB) was evaluated. The waste was characterized by IR, XRD and ICP, finding that Fe is the element found in the greatest quantity. The results of the individual decolorization of MO and RhB under two conditions are shown, one where three ratios of the Fenton reagents were evaluated, FeSO<sub>4</sub> waste:H<sub>2</sub>O<sub>2</sub>, which were 1:1, 1:3, 3: 1, and another that consisted of studying the effect of the initial concentration of MO and RhB on decolorization. It was found that the removal of both dyes with the 3:1 ratio was 90% in 20&#xa0;min. The decolorization was rapid and the kinetics were studied using first-order and Behnajady-Modirshahla-Ghanbery models. In the second part of this work, the decolorization of the mixture of MO-RhB was analyzed, finding that the color removal was 100% with the 3:1 ratio of FeSO<sub>4</sub> waste:H<sub>2</sub>O<sub>2</sub>. Finally, the decolorization of the mixture was studied in a water that simulates domestic wastewater, finding that in this complex matrix the color removal was complicated (85%). These results show that a waste from the local steel industry has potential applications for water treatment.</p> Graphical abstract <p></p>

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Valorization of local FeSO4 waste as a catalyst in a Fenton process for effective dye mixture decolorization

  • 期刊论文

  • 发表日期：

    2025年8月4日

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  • X. Berrones Bastar,
  • R. E. Ortega Herrera,
  • R. González-Chávez,
  • A. Sandoval-González,
  • J. Cárdenas-Mijangos,
  • C. Martínez-Sánchez

摘要

The development of catalysts often turns out to be a slow and expensive process from which small quantities of material are obtained, therefore, the search for economical and environmentally friendly materials is relevant. In this work, the use of FeSO4 waste generated in the steel industry as a catalyst in a homogeneous Fenton process for the individual and mixed decolorization of the dyes Methyl Orange (MO) and Rhodamine B (RhB) was evaluated. The waste was characterized by IR, XRD and ICP, finding that Fe is the element found in the greatest quantity. The results of the individual decolorization of MO and RhB under two conditions are shown, one where three ratios of the Fenton reagents were evaluated, FeSO4 waste:H2O2, which were 1:1, 1:3, 3: 1, and another that consisted of studying the effect of the initial concentration of MO and RhB on decolorization. It was found that the removal of both dyes with the 3:1 ratio was 90% in 20 min. The decolorization was rapid and the kinetics were studied using first-order and Behnajady-Modirshahla-Ghanbery models. In the second part of this work, the decolorization of the mixture of MO-RhB was analyzed, finding that the color removal was 100% with the 3:1 ratio of FeSO4 waste:H2O2. Finally, the decolorization of the mixture was studied in a water that simulates domestic wastewater, finding that in this complex matrix the color removal was complicated (85%). These results show that a waste from the local steel industry has potential applications for water treatment.

Graphical abstract