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<p>This research undertakes a thorough examination of the adsorption dynamics of methylene blue dye onto <i>Eriobotrya Japonica</i> grains, both in their native state and as post-extraction residues. A systematic evaluation was conducted across multiple operational parameters, including adsorbent mass, particle size, contact duration, dye concentration, medium pH, agitation speed, and temperature, to precisely determine their influence on adsorption capacity. The experimental findings demonstrated significant adsorption efficiencies of 87% for raw <i>Eriobotrya japonica</i> and 84% for its extracted waste under optimal conditions, signifying the effective adsorption of the cationic dye, methylene blue, onto both substrates. Comprehensive analyses, including kinetics, thermodynamics, and adsorption isotherms, were performed to elucidate the mechanisms driving the adsorption process. The data were modeled using both pseudo-first-order and pseudo-second-order kinetic equations, with the latter providing a more accurate fit to the experimental data. Isothermal studies highlighted the Freundlich model as the most suitable for describing the adsorption characteristics of methylene blue on these substrates. Thermodynamic and isothermal analyses collectively indicated that the adsorption process is spontaneous and exothermic, characteristic of a chemisorption-driven surface reaction. Consequently, <i>Eriobotrya japonica</i> seeds, in both their raw and residual forms, have been identified as highly effective adsorbents for the removal of cationic dyes from aqueous solutions. This study significantly enhances the understanding of the adsorption process and underscores the potential of <i>Eriobotrya japonica</i> seeds as eco-friendly and efficient adsorbents for the remediation of dye-contaminated water.</p> Graphical abstract <p></p>

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Investigation of equilibrium and kinetic aspects of methylene blue dye adsorption from aqueous solutions using raw and extract of Eriobotrya japonica seeds

  • 期刊论文

  • 发表日期：

    2025年3月21日

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  • Bouchra Belahrach,
  • Mohamed Farah,
  • Nora Samghouli,
  • Nouhaila Gadda,
  • Meryem Bensemlali,
  • Najoua Labjar,
  • Ghita Amine Benabdellah,
  • Souad El Hajjaji

摘要

This research undertakes a thorough examination of the adsorption dynamics of methylene blue dye onto Eriobotrya Japonica grains, both in their native state and as post-extraction residues. A systematic evaluation was conducted across multiple operational parameters, including adsorbent mass, particle size, contact duration, dye concentration, medium pH, agitation speed, and temperature, to precisely determine their influence on adsorption capacity. The experimental findings demonstrated significant adsorption efficiencies of 87% for raw Eriobotrya japonica and 84% for its extracted waste under optimal conditions, signifying the effective adsorption of the cationic dye, methylene blue, onto both substrates. Comprehensive analyses, including kinetics, thermodynamics, and adsorption isotherms, were performed to elucidate the mechanisms driving the adsorption process. The data were modeled using both pseudo-first-order and pseudo-second-order kinetic equations, with the latter providing a more accurate fit to the experimental data. Isothermal studies highlighted the Freundlich model as the most suitable for describing the adsorption characteristics of methylene blue on these substrates. Thermodynamic and isothermal analyses collectively indicated that the adsorption process is spontaneous and exothermic, characteristic of a chemisorption-driven surface reaction. Consequently, Eriobotrya japonica seeds, in both their raw and residual forms, have been identified as highly effective adsorbents for the removal of cationic dyes from aqueous solutions. This study significantly enhances the understanding of the adsorption process and underscores the potential of Eriobotrya japonica seeds as eco-friendly and efficient adsorbents for the remediation of dye-contaminated water.

Graphical abstract