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<p>This pioneering study presents a comprehensive strategy for valorizing&#xa0;<i>Moringa oleifera</i>&#xa0;pod powder (MOPP) and kernel powder (MOKP) as advanced biosorbents for methylene blue (MB) removal from aqueous environments. The research novelty lies in the systematic comparative assessment of both agricultural wastes, particularly highlighting the superior performance of underutilized pods, coupled with extensive regeneration studies and mechanistic investigations. Comprehensive characterization (FTIR, XRD, SEM–EDX, BET, pHpzc) revealed porous and heterogeneous surfaces, resulting in high methylene blue removal efficiencies (99.32% for MOPP and 72.12% for MOKP) and adsorption capacities up to 88.51 and 81.68&#xa0;mg/g, respectively, under optimal conditions (pH 8, 25&#xa0;°C, 60&#xa0;min. Kinetic data fitted well with the pseudo-second-order model (R<sup>2</sup> &gt; 0.996), while equilibrium isotherms followed the Freundlich model (R<sup>2</sup> &gt; 0.96), indicating multilayer adsorption on heterogeneous surfaces. Thermodynamic parameters (ΔG° = -6.71 to -7.07&#xa0;kJ/mol, ΔH° &lt; 0) confirmed spontaneous and exothermic adsorption processes. Regeneration studies demonstrated maintained efficiency &gt; 85% over five cycles, while comparative analysis revealed MOPP's superiority over other reported biosorbents. This research establishes&#xa0;<i>Moringa oleifera</i>&#xa0;wastes as promising, cost-effective alternatives for sustainable wastewater treatment, aligning with circular economy principles.</p>

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Valorization of Moringa oleifera Waste as Sustainable Biosorbents for Cationic Dye Removal

  • 期刊论文

  • 发表日期：

    2025年12月18日

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  • El Mehdi El Handaoui,
  • Ahmed Salim,
  • Abderrahim Jrifi,
  • Youssef Lghazi,
  • Abdeslam El Bouari,
  • Mohamed Tahiri,
  • Omar Tanane,
  • Omar Fanidi

摘要

This pioneering study presents a comprehensive strategy for valorizing Moringa oleifera pod powder (MOPP) and kernel powder (MOKP) as advanced biosorbents for methylene blue (MB) removal from aqueous environments. The research novelty lies in the systematic comparative assessment of both agricultural wastes, particularly highlighting the superior performance of underutilized pods, coupled with extensive regeneration studies and mechanistic investigations. Comprehensive characterization (FTIR, XRD, SEM–EDX, BET, pHpzc) revealed porous and heterogeneous surfaces, resulting in high methylene blue removal efficiencies (99.32% for MOPP and 72.12% for MOKP) and adsorption capacities up to 88.51 and 81.68 mg/g, respectively, under optimal conditions (pH 8, 25 °C, 60 min. Kinetic data fitted well with the pseudo-second-order model (R2 > 0.996), while equilibrium isotherms followed the Freundlich model (R2 > 0.96), indicating multilayer adsorption on heterogeneous surfaces. Thermodynamic parameters (ΔG° = -6.71 to -7.07 kJ/mol, ΔH° < 0) confirmed spontaneous and exothermic adsorption processes. Regeneration studies demonstrated maintained efficiency > 85% over five cycles, while comparative analysis revealed MOPP's superiority over other reported biosorbents. This research establishes Moringa oleifera wastes as promising, cost-effective alternatives for sustainable wastewater treatment, aligning with circular economy principles.