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<p>A novel material, Fe<sub>3</sub>O<sub>4</sub>@D-Tryptophan, was synthesized by functionalizing Fe₃O₄ nanoparticles with D-tryptophan. The Fe<sub>3</sub>O<sub>4</sub> nanoparticles were prepared via co-precipitation of FeCl<sub>3</sub>·6H<sub>2</sub>O and FeCl<sub>2</sub>·4H<sub>2</sub>O under alkaline conditions. The resulting material was characterized using X-ray diffraction (XRD), infrared spectroscopy (IR), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and magnetization measurements. XRD analysis confirmed the spinel structure and high purity of Fe<sub>3</sub>O<sub>4</sub>@D-Tryptophan, while FT-IR spectra revealed the characteristic vibrations of the functional groups introduced by D-tryptophan. Magnetization studies demonstrated that the magnetic properties of the ferrite remained largely unchanged after functionalization. FE-SEM coupled with energy dispersive X-ray spectroscopy (EDS) verified the elemental composition. TEM images showed well-defined spherical crystallites with an average size of 12&#xa0;nm. Furthermore, the adsorption performance of Fe<sub>3</sub>O<sub>4</sub>@D-Tryptophan was evaluated using titan yellow (TY) dye. The material exhibited a high adsorption efficiency of 99.73% within 10&#xa0;min under conditions of 10&#xa0;mg adsorbent dosage, 10&#xa0;mg·L⁻<sup>1</sup> initial dye concentration, pH= 6.5, and T=25&#xa0;°C. Kinetic analysis revealed that the adsorption process followed a pseudo-second-order model. The isotherm study showed that the adsorption behavior followed the Langmuir model.</p>

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Synthesis and Application of D-Tryptophan Functionalized Fe3O4 Nanoparticles for Adsorption of Titan Yellow Dye

  • 期刊论文

  • 发表日期：

    2025年9月14日

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  • Siwar El Ghali,
  • Abdessalem Badri,
  • Sami Slimi,
  • Afef Mehri,
  • Inmaculada Alvarez-Serrano,
  • Xavier Mateos,
  • Faouzi Aloui

摘要

A novel material, Fe3O4@D-Tryptophan, was synthesized by functionalizing Fe₃O₄ nanoparticles with D-tryptophan. The Fe3O4 nanoparticles were prepared via co-precipitation of FeCl3·6H2O and FeCl2·4H2O under alkaline conditions. The resulting material was characterized using X-ray diffraction (XRD), infrared spectroscopy (IR), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and magnetization measurements. XRD analysis confirmed the spinel structure and high purity of Fe3O4@D-Tryptophan, while FT-IR spectra revealed the characteristic vibrations of the functional groups introduced by D-tryptophan. Magnetization studies demonstrated that the magnetic properties of the ferrite remained largely unchanged after functionalization. FE-SEM coupled with energy dispersive X-ray spectroscopy (EDS) verified the elemental composition. TEM images showed well-defined spherical crystallites with an average size of 12 nm. Furthermore, the adsorption performance of Fe3O4@D-Tryptophan was evaluated using titan yellow (TY) dye. The material exhibited a high adsorption efficiency of 99.73% within 10 min under conditions of 10 mg adsorbent dosage, 10 mg·L⁻1 initial dye concentration, pH= 6.5, and T=25 °C. Kinetic analysis revealed that the adsorption process followed a pseudo-second-order model. The isotherm study showed that the adsorption behavior followed the Langmuir model.