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<p>The [Zn–Al–Cl] layered double hydroxide (LDH) was synthesized by co-precipitation at constant pH and used to remove Fluorescein dye from water. Several parameters were optimized, including the solution pH, the contact time, and the temperature. The maximum adsorption capacity was obtained at a pH close to 7. The adsorption phenomenon fits well with the pseudo-second-order kinetics model, with the Freundlich model being the most appropriate to describe it. The thermodynamic study indicates that the interaction between LDH and Fluorescein is spontaneous and endothermic. It is accompanied by an increase in disorder (Δ<sub>ads</sub>G<sup>0</sup> &lt; 0, Δ<sub>ads</sub>H<sup>0</sup> &gt; 0 and Δ<sub>ads</sub>S<sup>0</sup> &gt; 0). The standard enthalpy of adsorption (Δ<sub>ads</sub>H<sup>0</sup> =  + 30.01 kJ.mol<sup>−1</sup>) suggests the formation of hydrogen bonds between Fluorescein and [Zn–Al–Cl]. These results are confirmed by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, thermal analyses and UV–Visible spectrofluorimetry.</p> Graphical Abstract <p></p>

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Efficient Fluorescein Removal by [Zn–Al–Cl] Layered Double Hydroxide: Kinetics and Thermodynamics Analysis

  • 期刊论文

  • 发表日期：

    2025年3月4日

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  • Adnane Seman,
  • Dalal Badreddine,
  • Ayoub Salim,
  • Mohamed Anouar Harrad,
  • Jonathan Piard,
  • El Habib Ait Addi,
  • Ali Assabbane,
  • Mohammed Badreddine,
  • Ahmed Legrouri

摘要

The [Zn–Al–Cl] layered double hydroxide (LDH) was synthesized by co-precipitation at constant pH and used to remove Fluorescein dye from water. Several parameters were optimized, including the solution pH, the contact time, and the temperature. The maximum adsorption capacity was obtained at a pH close to 7. The adsorption phenomenon fits well with the pseudo-second-order kinetics model, with the Freundlich model being the most appropriate to describe it. The thermodynamic study indicates that the interaction between LDH and Fluorescein is spontaneous and endothermic. It is accompanied by an increase in disorder (ΔadsG0 < 0, ΔadsH0 > 0 and ΔadsS0 > 0). The standard enthalpy of adsorption (ΔadsH0 =  + 30.01 kJ.mol−1) suggests the formation of hydrogen bonds between Fluorescein and [Zn–Al–Cl]. These results are confirmed by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, thermal analyses and UV–Visible spectrofluorimetry.

Graphical Abstract