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<p>In this research work, the adsorption efficacy of the produced biochar from eucalyptus wood waste on the removal of aluminium ions (Al<sup>3</sup>⁺) in water is examined. The obtained biochar through slow pyrolysis at 450&#xa0;°C was analyzed using SEM, FTIR, and BET analysis techniques showing mesoporous nature (with average pore size of 3.82 nm), specific surface area of 18.37 m<sup>2</sup>/g, and functional groups rich in oxygen. Batch experiments were used in determining the effect of the influencing parameters such as pH, contact time, adsorbent dosage, initial Al<sup>3</sup>⁺ concentration, and temperature on adsorption process. Pseudo-second order kinetic model (<i>R</i><sup>2</sup> = 0.994) was found to fit the adsorption kinetics, while Langmuir isotherm model (<i>R</i><sup>2</sup> = 0.991) was the best-fitting for the adsorption equilibrium process implying monolayer chemisorption with maximum adsorption capacity of 139.2 mg/g. Adsorption process proved to be spontaneous (Δ<i>G</i>° &lt; 0) and exothermic (Δ<i>H</i>° = − 38.53 kJ/mol). Moreover, biochar showed good recyclability by maintaining 78% of adsorption capacity after five adsorption–desorption cycles.</p>

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Eucalyptus wood waste-derived biochar for aluminum adsorption: kinetic, equilibrium, and thermodynamic studies for heavy metal remediation

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Ahmed Salim,
  • Maha Adel,
  • Oumaima Mjahed,
  • El mehdi El Handaoui,
  • Mohamed Bennar,
  • Amina Alaoui,
  • Abderrahim Jrifi,
  • Mohamed Tahiri,
  • Omar Tanane

摘要

In this research work, the adsorption efficacy of the produced biochar from eucalyptus wood waste on the removal of aluminium ions (Al3⁺) in water is examined. The obtained biochar through slow pyrolysis at 450 °C was analyzed using SEM, FTIR, and BET analysis techniques showing mesoporous nature (with average pore size of 3.82 nm), specific surface area of 18.37 m2/g, and functional groups rich in oxygen. Batch experiments were used in determining the effect of the influencing parameters such as pH, contact time, adsorbent dosage, initial Al3⁺ concentration, and temperature on adsorption process. Pseudo-second order kinetic model (R2 = 0.994) was found to fit the adsorption kinetics, while Langmuir isotherm model (R2 = 0.991) was the best-fitting for the adsorption equilibrium process implying monolayer chemisorption with maximum adsorption capacity of 139.2 mg/g. Adsorption process proved to be spontaneous (ΔG° < 0) and exothermic (ΔH° = − 38.53 kJ/mol). Moreover, biochar showed good recyclability by maintaining 78% of adsorption capacity after five adsorption–desorption cycles.