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<p>This study introduces an innovative method to remove dyes using a composite material of magnetite nanoparticles (MNPs) immobilized in nanofibers (MNFs). Produced via a simple electrospinning method, the MNFs exhibited excellent adsorptive properties, including a uniform average diameter of 0.3 ± 0.06&#xa0;μm, a BET surface area of 9.9457 ± 0.0363 m<sup>2</sup> g<sup>−1</sup>, a pore volume of 0.02 cm<sup>3</sup> g<sup>−1</sup>, and a pore size of 8.778&#xa0;nm. Chemical and thermal analyses confirmed the composite’s characteristics. The adsorption performance of MNFs was assessed using two ionic dyes: cationic Toluidine Blue (TB) and anionic Congo Red (CR). Compared to MNPs, MNFs achieved significantly higher adsorption capacities, with values of 325 mg g<sup>−1</sup> for TB and 350 mg g<sup>−1</sup> for CR at a dye concentration of 1&#xa0;g L<sup>−1</sup>. The adsorption kinetics were analyzed, fitting well with the Pseudo-Second-Order model. The MNFs demonstrated enhanced adsorption capacities, increasing by up to 15% for TB and 20% for CR compared to MNPs under identical conditions. These results underscore MNFs’ potential as effective adsorbents for dye removal, offering an environmentally friendly and cost-effective treatment for industrial wastewater.</p>

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Magnetic Composite Nanofibers as Advanced Adsorbents for Toluidine Blue and Congo Red Dyes

  • 期刊论文

  • 发表日期：

    2025年1月9日

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  • Hajer Tlili,
  • Anis Elaoud,
  • Nedra Asses,
  • Jesús A. Fuentes-García,
  • Karima Horchani-Naifer,
  • Mounir Ferhi

摘要

This study introduces an innovative method to remove dyes using a composite material of magnetite nanoparticles (MNPs) immobilized in nanofibers (MNFs). Produced via a simple electrospinning method, the MNFs exhibited excellent adsorptive properties, including a uniform average diameter of 0.3 ± 0.06 μm, a BET surface area of 9.9457 ± 0.0363 m2 g−1, a pore volume of 0.02 cm3 g−1, and a pore size of 8.778 nm. Chemical and thermal analyses confirmed the composite’s characteristics. The adsorption performance of MNFs was assessed using two ionic dyes: cationic Toluidine Blue (TB) and anionic Congo Red (CR). Compared to MNPs, MNFs achieved significantly higher adsorption capacities, with values of 325 mg g−1 for TB and 350 mg g−1 for CR at a dye concentration of 1 g L−1. The adsorption kinetics were analyzed, fitting well with the Pseudo-Second-Order model. The MNFs demonstrated enhanced adsorption capacities, increasing by up to 15% for TB and 20% for CR compared to MNPs under identical conditions. These results underscore MNFs’ potential as effective adsorbents for dye removal, offering an environmentally friendly and cost-effective treatment for industrial wastewater.