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<p>This recent study explores the ability of lignocellulosic waste materials derived from almond shells to remove hexavalent chromium from the aquatic environment. Experiments investigating adsorption were performed under various operational conditions such as pH level, initial Cr(VI) concentration, temperature, contact time, and quantity of adsorbent. The impact of these variables on adsorption capability was scrutinized and optimized for superior removal efficiency. The adsorption of Cr(VI) on almond shells reached its peak in acidic conditions at a pH of 2, with the initial Cr(VI) concentration set at 140&#xa0;mg/L, almond shell dosage at 50&#xa0;mg of average size: 100&#xa0;µm, and an equilibrium contact time of 80&#xa0;min. Adsorption data were evaluated in light of multiple adsorption models, including the Langmuir isotherm model, to extract assorted equilibrium parameters like the maximum adsorption capacity, adsorption kinetics, and equilibrium between adsorbate and adsorbent. Applying the Langmuir model to experimental adsorption data proposed that at 30&#xa0;°C, the maximum adsorption capacity was 28.57&#xa0;mg/g. The derived thermodynamic parameters suggested that the adsorption process was spontaneous and endothermic. The interaction between the almond shell and chromate ions was swift, and the kinetics conformed to the reversible second-order Lagergren adsorption equation. The outcomes affirm that the almond shell exhibits an exceptional adsorption capacity, thus highlighting its potential as an effective strategy for the removal of Cr(VI) from aqueous systems.</p>

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Almond shells based-lignocellulosic waste materials for a high removal efficacy of chromium (VI) ions from waste water

  • 期刊论文

  • 发表日期：

    2025年2月14日

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  • Abderrahim Kali,
  • Younes Dehmani,
  • Abdelouahed Amar,
  • Ilyasse Loulidi,
  • Abderrazek El-kordy,
  • Maria Jabri,
  • Mohamed Sadoq,
  • Hafssa Atlass,
  • Imame Smail,
  • Imane Merimi,
  • Fatima Boukhlifi

摘要

This recent study explores the ability of lignocellulosic waste materials derived from almond shells to remove hexavalent chromium from the aquatic environment. Experiments investigating adsorption were performed under various operational conditions such as pH level, initial Cr(VI) concentration, temperature, contact time, and quantity of adsorbent. The impact of these variables on adsorption capability was scrutinized and optimized for superior removal efficiency. The adsorption of Cr(VI) on almond shells reached its peak in acidic conditions at a pH of 2, with the initial Cr(VI) concentration set at 140 mg/L, almond shell dosage at 50 mg of average size: 100 µm, and an equilibrium contact time of 80 min. Adsorption data were evaluated in light of multiple adsorption models, including the Langmuir isotherm model, to extract assorted equilibrium parameters like the maximum adsorption capacity, adsorption kinetics, and equilibrium between adsorbate and adsorbent. Applying the Langmuir model to experimental adsorption data proposed that at 30 °C, the maximum adsorption capacity was 28.57 mg/g. The derived thermodynamic parameters suggested that the adsorption process was spontaneous and endothermic. The interaction between the almond shell and chromate ions was swift, and the kinetics conformed to the reversible second-order Lagergren adsorption equation. The outcomes affirm that the almond shell exhibits an exceptional adsorption capacity, thus highlighting its potential as an effective strategy for the removal of Cr(VI) from aqueous systems.