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<p>The article presents a study on the valorization of Spent Bleaching Earth (SBE), a by-product produced in large quantities by edible oil refineries, particularly in Algeria, where it poses environmental problems due to its high content of residual oils and contaminants. The main objective is to optimize the regeneration of this earth by thermal treatment in order to transform it into an effective adsorbent, particularly for the removal of methylene blue, a model dye. The study is carried out in two stages: first, the effect of carbonization temperature (400 to 900&#xa0;°C) on the structural and textural properties of SBE is examined, revealing that a temperature of 800&#xa0;°C maximizes microporosity before the structure collapses at 900&#xa0;°C. Then, an optimization of the time and temperature parameters is carried out via a Face-Centered Central Composite Design (FCCCD) and a response surface methodology, which makes it possible to identify optimal conditions around 600&#xa0;°C and 48&#xa0;min to obtain a material whose adsorption capacity reaches 72.8%, experimentally validated at 71.04%. The analyses (ATG, FTIR, DRX, BET) confirm that the thermal treatment eliminates organic compounds and develops microporosity without altering the silicate structure up to 800&#xa0;°C, and that temperature is the most determining factor for the performance of the regenerated material. This work thus demonstrates that SBE can be effectively valorized by optimized thermal regeneration, offering a sustainable solution for the management of this hazardous waste while producing a high-performance adsorbent for water treatment.</p>

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Optimization of thermal regeneration of used bleaching earth by face-centered central composite design for the production of an efficient adsorbent for polluted water

  • 期刊论文

  • 发表日期：

    2025年12月16日

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  • Chafika Meziti,
  • Imane Akkari,
  • Atmane Djermoune,
  • Yasmina Benaidja,
  • Abdelhamid Boukerroui,
  • Souaad Hamoudi,
  • Farid Ait Merzeg,
  • Yassine Bounouri,
  • Benoît Cagnon

摘要

The article presents a study on the valorization of Spent Bleaching Earth (SBE), a by-product produced in large quantities by edible oil refineries, particularly in Algeria, where it poses environmental problems due to its high content of residual oils and contaminants. The main objective is to optimize the regeneration of this earth by thermal treatment in order to transform it into an effective adsorbent, particularly for the removal of methylene blue, a model dye. The study is carried out in two stages: first, the effect of carbonization temperature (400 to 900 °C) on the structural and textural properties of SBE is examined, revealing that a temperature of 800 °C maximizes microporosity before the structure collapses at 900 °C. Then, an optimization of the time and temperature parameters is carried out via a Face-Centered Central Composite Design (FCCCD) and a response surface methodology, which makes it possible to identify optimal conditions around 600 °C and 48 min to obtain a material whose adsorption capacity reaches 72.8%, experimentally validated at 71.04%. The analyses (ATG, FTIR, DRX, BET) confirm that the thermal treatment eliminates organic compounds and develops microporosity without altering the silicate structure up to 800 °C, and that temperature is the most determining factor for the performance of the regenerated material. This work thus demonstrates that SBE can be effectively valorized by optimized thermal regeneration, offering a sustainable solution for the management of this hazardous waste while producing a high-performance adsorbent for water treatment.