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<p>This study investigates the dynamic adsorption of basic fuchsin in a fixed-bed column using copper-crosslinked alginate–diatomite beads, integrating column experiments, kinetic modeling, and numerical simulation. Breakthrough experiments showed strong dependence on bed height, flow rate, and inlet concentration, achieving a maximum capacity of 0.69 mg.g<sup>− 1</sup> and 82.84% removal efficiency at optimal conditions (bed height = 15&#xa0;cm, flow rate = 2 mL/min, inlet dye concentration = 5 mg.L<sup>− 1</sup>). Four dynamic models were applied: Thomas (q₀ = 0.19–0.67 mg.g<sup>− 1</sup>, Mean Square Error (MSE) = 0.001–0.0068) and Yoon–Nelson (τ up to 344.92&#xa0;min, MSE ≥ 0.0011) showed high predictive accuracy; Clark, consistent with Freundlich behavior (Ac up to 965.34), best reconciled theoretical and experimental results; Bohart–Adams effectively captured early breakthrough trends. Numerical simulations reproduced the sigmoidal breakthrough curves and radial adsorption profiles, with mean square errors around 0.01 for most curves under different operating conditions. A slight radial increase in adsorption from the bead center to its surface was observed, indicating that intra-particle diffusion was relatively fast and only a minor contributor to overall mass transfer resistance under the studied conditions.</p>

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Dynamic Adsorption of Basic Fuchsin onto Alginate–Diatomite Beads: Fixed-Bed Experiments, Modeling, and Simulation

  • 期刊论文

  • 发表日期：

    2026年3月21日

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  • Malika Ouagued,
  • Abderrahmane Djafer,
  • Khouloud Keddar,
  • Halima Mammeri,
  • Hassiba Bessaha,
  • Farhate Bensalah,
  • Hakim Aguedal,
  • Yacine Allab,
  • Mohamed El Amine Elaissaoui Elmeliani

摘要

This study investigates the dynamic adsorption of basic fuchsin in a fixed-bed column using copper-crosslinked alginate–diatomite beads, integrating column experiments, kinetic modeling, and numerical simulation. Breakthrough experiments showed strong dependence on bed height, flow rate, and inlet concentration, achieving a maximum capacity of 0.69 mg.g− 1 and 82.84% removal efficiency at optimal conditions (bed height = 15 cm, flow rate = 2 mL/min, inlet dye concentration = 5 mg.L− 1). Four dynamic models were applied: Thomas (q₀ = 0.19–0.67 mg.g− 1, Mean Square Error (MSE) = 0.001–0.0068) and Yoon–Nelson (τ up to 344.92 min, MSE ≥ 0.0011) showed high predictive accuracy; Clark, consistent with Freundlich behavior (Ac up to 965.34), best reconciled theoretical and experimental results; Bohart–Adams effectively captured early breakthrough trends. Numerical simulations reproduced the sigmoidal breakthrough curves and radial adsorption profiles, with mean square errors around 0.01 for most curves under different operating conditions. A slight radial increase in adsorption from the bead center to its surface was observed, indicating that intra-particle diffusion was relatively fast and only a minor contributor to overall mass transfer resistance under the studied conditions.