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<p>The contamination of aqueous effluents by organic pollutants, particularly synthetic dyes, represents a major global environmental concern. This study focuses on the development and evaluation of bioadsorbents derived from agro-industrial waste (a mixture of orange peels, fibers, pulp, and seeds) from the N’gaous processing industry. This approach aligns with a circular economy strategy, simultaneously targeting wastewater remediation and the management of industrial by-products. Three adsorbents materials were prepared: the raw untreated biomass (OW) and two materials obtained via thermal treatment at 200&#xa0;°C (OWT200) and 400&#xa0;°C (OWT400). Physicochemical characterization was performed using Fourier-transform infrared spectroscopy (FTIR) to identify surface functional groups, laser granulometry to determine particle size distribution, and determination of the point of zero charge (PZC) to evaluate pH-dependent surface properties. The results suggest that elevating the treatment temperature induces structural and/or chemical modifications favorable to adsorption, as evidenced by the enhanced adsorption capacity observed for OWT400 compared to OWT200 and OW. The adsorption efficiency for Methylene Blue (MB) in aqueous solution was investigated using a batch system. The influence of key operating parameters—initial solution pH, contact time, adsorbent dosage, and initial adsorbate concentration was evaluated. Kinetic analysis revealed a good fit of the experimental data to the pseudo-second-order model. The adsorption equilibrium study was conducted by fitting the experimental data to the Langmuir, Freundlich, and Temkin isotherm models. The Freundlich model provided the best correlation, suggesting adsorption onto a heterogeneous surface with possible interactions between adsorbed molecules.</p>

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Sustainable water treatment using bioadsorbents from agro-industrial waste: a circular strategy for pollution control

  • 期刊论文

  • 发表日期：

    2026年4月13日

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  • A. Ghedjemis,
  • M. Kebaili

摘要

The contamination of aqueous effluents by organic pollutants, particularly synthetic dyes, represents a major global environmental concern. This study focuses on the development and evaluation of bioadsorbents derived from agro-industrial waste (a mixture of orange peels, fibers, pulp, and seeds) from the N’gaous processing industry. This approach aligns with a circular economy strategy, simultaneously targeting wastewater remediation and the management of industrial by-products. Three adsorbents materials were prepared: the raw untreated biomass (OW) and two materials obtained via thermal treatment at 200 °C (OWT200) and 400 °C (OWT400). Physicochemical characterization was performed using Fourier-transform infrared spectroscopy (FTIR) to identify surface functional groups, laser granulometry to determine particle size distribution, and determination of the point of zero charge (PZC) to evaluate pH-dependent surface properties. The results suggest that elevating the treatment temperature induces structural and/or chemical modifications favorable to adsorption, as evidenced by the enhanced adsorption capacity observed for OWT400 compared to OWT200 and OW. The adsorption efficiency for Methylene Blue (MB) in aqueous solution was investigated using a batch system. The influence of key operating parameters—initial solution pH, contact time, adsorbent dosage, and initial adsorbate concentration was evaluated. Kinetic analysis revealed a good fit of the experimental data to the pseudo-second-order model. The adsorption equilibrium study was conducted by fitting the experimental data to the Langmuir, Freundlich, and Temkin isotherm models. The Freundlich model provided the best correlation, suggesting adsorption onto a heterogeneous surface with possible interactions between adsorbed molecules.