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<p>This study explores the use of heterogeneous Fenton and photo-Fenton processes to treat the textile dye Crystal Violet with a bio-sourced catalyst. The catalyst was embedded in calcium alginate beads, to serve as a heterogeneous catalyst in Fenton and photo-Fenton reactions for degrading Crystal Violet. Various techniques were used to characterize the catalyst. SEM analysis showed an improved surface area of beads, indicating the existing of more photo-catalytically active sites. The surface area was found to be S <sub>BET</sub> = 26 m<sup>2</sup>/g. the average pore diameter to be 18.82&#xa0;nm. An experimental study was applied on CV to evaluate the effectiveness of the systems (Beads /H<sub>2</sub>O<sub>2</sub>) and (Beads /H<sub>2</sub>O<sub>2</sub>/ UV-C) on their degradation. The heterogeneous photo-Fenton process using the prepared photo-catalyst was very efficient with 100% of CV dye removal within 30&#xa0;min under optimum conditions. On the other hand, heterogeneous Fenton process shows very promising results by removing 96.7% of CV dye after 60&#xa0;min of treatment. Adsorption step of the CV dye onto the beads followed Langmuir model and pseudo-second-order kinetic, suggesting monolayer adsorption. While, the mechanism of CV dye degradation through photo-Fenton process followed also the pseudo-second-order kinetic model. This cost-effective, eco-friendly, and non-toxic heterogeneous catalyst was successfully regenerated and proved its stability after six cycles of oxidation treatment. When applied to real textile effluent, the process yielded excellent results and remarkably reduced the COD, DBO<sub>5</sub>, and pH levels from 1400 to 80&#xa0;mg L<sup>−1</sup>, 600 to 30&#xa0;mg L<sup>−1</sup>, and 10 to 8, respectively within 30&#xa0;min.</p>

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Enhanced Cationic Dye Degradation via Photo-Fenton Process Using Iron Oxide-Biopolymer Composites: Application in Textile Wastewater Treatment

  • 期刊论文

  • 发表日期：

    2025年11月2日

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  • Sirine Ben Ayed,
  • Lamjed Mansour,
  • Amel Ben Othman,
  • Fadhila Ayari

摘要

This study explores the use of heterogeneous Fenton and photo-Fenton processes to treat the textile dye Crystal Violet with a bio-sourced catalyst. The catalyst was embedded in calcium alginate beads, to serve as a heterogeneous catalyst in Fenton and photo-Fenton reactions for degrading Crystal Violet. Various techniques were used to characterize the catalyst. SEM analysis showed an improved surface area of beads, indicating the existing of more photo-catalytically active sites. The surface area was found to be S BET = 26 m2/g. the average pore diameter to be 18.82 nm. An experimental study was applied on CV to evaluate the effectiveness of the systems (Beads /H2O2) and (Beads /H2O2/ UV-C) on their degradation. The heterogeneous photo-Fenton process using the prepared photo-catalyst was very efficient with 100% of CV dye removal within 30 min under optimum conditions. On the other hand, heterogeneous Fenton process shows very promising results by removing 96.7% of CV dye after 60 min of treatment. Adsorption step of the CV dye onto the beads followed Langmuir model and pseudo-second-order kinetic, suggesting monolayer adsorption. While, the mechanism of CV dye degradation through photo-Fenton process followed also the pseudo-second-order kinetic model. This cost-effective, eco-friendly, and non-toxic heterogeneous catalyst was successfully regenerated and proved its stability after six cycles of oxidation treatment. When applied to real textile effluent, the process yielded excellent results and remarkably reduced the COD, DBO5, and pH levels from 1400 to 80 mg L−1, 600 to 30 mg L−1, and 10 to 8, respectively within 30 min.