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<p>In the context of sustainable landfill leachate management, this study aims to evaluate the efficiency of advanced oxidation processes (AOPs) for the treatment of synthetic leachate, with a particular focus on reducing Chemical Oxygen Demand (COD) and mineral ions (NH<sub>4</sub><sup>+</sup>, NO<sub>3</sub><sup>−</sup>, NO<sub>2</sub><sup>−</sup>, PO<sub>4</sub><sup>3−</sup>). Two processes were investigated: heterogeneous photocatalysis using titanium dioxide (TiO<sub>2</sub>) under different irradiation systems (UV-A and UV-C). Preliminary dark adsorption tests established an equilibrium time of 5–6&#xa0;h and identified an optimal catalyst dose of 1&#xa0;g/L. The results also indicated that adsorption efficiency decreased with increasing initial pollutant concentrations. Photocatalytic experiments revealed that heterogeneous photocatalysis under UV-C irradiation (75 W) yielded the highest performance, achieving a COD removal efficiency of 88.3% after 24&#xa0;h, compared to 79% after 16&#xa0;h, while the reduction of mineral ions plateaued beyond 16&#xa0;h. This enhanced performance is attributed to the generation of highly reactive hydroxyl radicals produced at the surface of UV-C activated TiO<sub>2</sub>, capable of degrading persistent organic compounds without forming toxic byproducts. The study highlights the potential of AOPs, particularly TiO<sub>2</sub>-based heterogeneous photocatalysis, as an effective, eco-friendly solution for leachate treatment. It also suggests that coupling adsorption with photocatalysis could offer a promising approach for optimizing the decontamination of complex effluents.</p>

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TiO2-based photocatalysis under UV irradiation for efficient chemical oxygen demand and mineral ion removal from a synthetic leachate

  • 期刊论文

  • 发表日期：

    2026年5月6日

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  • Asmae Charki,
  • Najlae Zaki,
  • Nouhaila Hadoudi,
  • Oumaima Fraiha,
  • Mohamed Bahouch,
  • Amin Salhi,
  • Abdellah Elyoussfi,
  • Hassan Amhamdi,
  • Hossain El Ouarghi,
  • M’hamed Ahari

摘要

In the context of sustainable landfill leachate management, this study aims to evaluate the efficiency of advanced oxidation processes (AOPs) for the treatment of synthetic leachate, with a particular focus on reducing Chemical Oxygen Demand (COD) and mineral ions (NH4+, NO3−, NO2−, PO43−). Two processes were investigated: heterogeneous photocatalysis using titanium dioxide (TiO2) under different irradiation systems (UV-A and UV-C). Preliminary dark adsorption tests established an equilibrium time of 5–6 h and identified an optimal catalyst dose of 1 g/L. The results also indicated that adsorption efficiency decreased with increasing initial pollutant concentrations. Photocatalytic experiments revealed that heterogeneous photocatalysis under UV-C irradiation (75 W) yielded the highest performance, achieving a COD removal efficiency of 88.3% after 24 h, compared to 79% after 16 h, while the reduction of mineral ions plateaued beyond 16 h. This enhanced performance is attributed to the generation of highly reactive hydroxyl radicals produced at the surface of UV-C activated TiO2, capable of degrading persistent organic compounds without forming toxic byproducts. The study highlights the potential of AOPs, particularly TiO2-based heterogeneous photocatalysis, as an effective, eco-friendly solution for leachate treatment. It also suggests that coupling adsorption with photocatalysis could offer a promising approach for optimizing the decontamination of complex effluents.