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<p>In this study, a magnetic nanoparticle/clay mineral composite was synthesized and applied for the effective adsorption of lanthanum ions (La(III)) from aqueous solutions. Batch adsorption results conformed well to the non-linear Langmuir isotherm model, revealing a maximum adsorption capacity of 111.62 mg/g at 25  °C, indicative of monolayer adsorption on a homogeneous surface. Kinetic analysis confirmed that the process followed a pseudo-second-order model, highlighting chemisorption as the dominant mechanism. Box–Behnken design was used to identify optimal adsorption conditions by assessing the interactive effects of multiple parameters. In addition to batch studies, fixed-bed column experiments were conducted, and the Thomas model effectively described the dynamic behavior of La(III) under continuous flow, validating the potential scalability of the system. Furthermore, desorption experiments demonstrated that acidic agents, particularly HCl, enabled efficient regeneration of the adsorbent over multiple cycles, confirming the material’s reusability. Overall, the magnetic nanoparticle/clay composite shows strong potential for sustainable and high-efficiency La(III) recovery in environmental and industrial applications.</p>

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Optimized adsorption and recovery of rare lanthanum ions using magnetic nanoparticle/clay mineral composite: batch, column, and Box–Behnken design approach

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • Abdelali Aboussabek,
  • Latifa Boukarma,
  • Ikbal Gozde Kaptanoglu,
  • Sule Aytas,
  • Sabriye Yusan,
  • Mohamed Zerbet,
  • Mohamed Chiban

摘要

In this study, a magnetic nanoparticle/clay mineral composite was synthesized and applied for the effective adsorption of lanthanum ions (La(III)) from aqueous solutions. Batch adsorption results conformed well to the non-linear Langmuir isotherm model, revealing a maximum adsorption capacity of 111.62 mg/g at 25  °C, indicative of monolayer adsorption on a homogeneous surface. Kinetic analysis confirmed that the process followed a pseudo-second-order model, highlighting chemisorption as the dominant mechanism. Box–Behnken design was used to identify optimal adsorption conditions by assessing the interactive effects of multiple parameters. In addition to batch studies, fixed-bed column experiments were conducted, and the Thomas model effectively described the dynamic behavior of La(III) under continuous flow, validating the potential scalability of the system. Furthermore, desorption experiments demonstrated that acidic agents, particularly HCl, enabled efficient regeneration of the adsorbent over multiple cycles, confirming the material’s reusability. Overall, the magnetic nanoparticle/clay composite shows strong potential for sustainable and high-efficiency La(III) recovery in environmental and industrial applications.