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<p>This study aimed to enhance the adsorption performance of diatomite through iron doping and evaluate its efficiency in removing Rhodamine B (RhB) dye from aqueous solutions. The adsorbents were characterized using X-ray fluorescence (XRF), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), Fourier-transform infrared spectroscopy (FTIR), and point of zero charge (pHpzc) determination. XRF results indicated that raw diatomite was mainly composed of SiO₂ (61.29%) and CaO (15.22%), and iron incorporation increased Fe₂O₃ content from 2.72% to 8.59%. Batch adsorption experiments systematically examined the effects of pH, contact time, adsorbent dosage, and initial dye concentration. Optimal adsorption was observed at pH 3 for both adsorbents. Non-linear kinetic and isotherm modeling demonstrated that the pseudo-first order model best described the adsorption process, indicating diffusion-controlled mechanisms. Langmuir analysis revealed maximum adsorption capacities of 11.78 mg/g for raw diatomite and 19.94 mg/g for iron-doped diatomite, representing a 69% improvement. These results highlight iron-doped diatomite as a cost-effective and promising adsorbent for cationic dye removal in wastewater treatment applications.</p>

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Modification of diatomite by iron doping for improved rhodamine B removal: adsorption mechanism, kinetics, and isotherms

  • 期刊论文

  • 发表日期：

    2025年10月8日

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  • Nadjia Belmehdi,
  • Mohamed Hadjel,
  • Mohammed Amin Bezzekhami

摘要

This study aimed to enhance the adsorption performance of diatomite through iron doping and evaluate its efficiency in removing Rhodamine B (RhB) dye from aqueous solutions. The adsorbents were characterized using X-ray fluorescence (XRF), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), Fourier-transform infrared spectroscopy (FTIR), and point of zero charge (pHpzc) determination. XRF results indicated that raw diatomite was mainly composed of SiO₂ (61.29%) and CaO (15.22%), and iron incorporation increased Fe₂O₃ content from 2.72% to 8.59%. Batch adsorption experiments systematically examined the effects of pH, contact time, adsorbent dosage, and initial dye concentration. Optimal adsorption was observed at pH 3 for both adsorbents. Non-linear kinetic and isotherm modeling demonstrated that the pseudo-first order model best described the adsorption process, indicating diffusion-controlled mechanisms. Langmuir analysis revealed maximum adsorption capacities of 11.78 mg/g for raw diatomite and 19.94 mg/g for iron-doped diatomite, representing a 69% improvement. These results highlight iron-doped diatomite as a cost-effective and promising adsorbent for cationic dye removal in wastewater treatment applications.