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<p>This study explores the use of <i>Moringa oleifera</i> plant parts—seeds (MoS), husks (MoK), and leaves (MoL)—as low-cost bioadsorbents for the removal of methylene blue (MB) from aqueous solutions. The adsorbents were incorporated into gelatin-based hydrogel beads and evaluated under varying conditions, including pH, dosage, initial MB concentration, contact time, and temperature. The adsorption process followed pseudo-second-order kinetics and fitted best with the Sips isotherm model. Maximum adsorption capacities were 140&#xa0;mg&#xa0;g<sup>−1</sup> for MoS/Gel, 90&#xa0;mg&#xa0;g<sup>−1</sup> for MoL/Gel, and 85&#xa0;mg&#xa0;g<sup>−1</sup> for MoK/Gel at pH 8.0 and 298&#xa0;K, achieving removal efficiencies between 75-90% within 10&#xa0;min. FTIR-ATR analysis confirmed the involvement of functional groups such as –COOH, –OH, –NH<sub>2</sub>, and C = O in the adsorption process. The results highlight that&#xa0;<i>Moringa oleifera</i>, particularly its seeds, as an effective and sustainable option for dye removal in water treatment.</p>

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Efficient and rapid removal of methylene blue (MB) using Moringa oleifera-based bioadsorbents: Harnessing the powder for fabrication of new hydrogel beads

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Kawther Boumediene,
  • Kacem Ben Binah,
  • Mohamed Belkacem,
  • M. Naushad,
  • Asmaa Benettayeb,
  • Boumediene Haddou,
  • Kahina Bentaleb,
  • Ulrich Maschke

摘要

This study explores the use of Moringa oleifera plant parts—seeds (MoS), husks (MoK), and leaves (MoL)—as low-cost bioadsorbents for the removal of methylene blue (MB) from aqueous solutions. The adsorbents were incorporated into gelatin-based hydrogel beads and evaluated under varying conditions, including pH, dosage, initial MB concentration, contact time, and temperature. The adsorption process followed pseudo-second-order kinetics and fitted best with the Sips isotherm model. Maximum adsorption capacities were 140 mg g−1 for MoS/Gel, 90 mg g−1 for MoL/Gel, and 85 mg g−1 for MoK/Gel at pH 8.0 and 298 K, achieving removal efficiencies between 75-90% within 10 min. FTIR-ATR analysis confirmed the involvement of functional groups such as –COOH, –OH, –NH2, and C = O in the adsorption process. The results highlight that Moringa oleifera, particularly its seeds, as an effective and sustainable option for dye removal in water treatment.