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<p>Water pollution is a critical ecological problem and subsequently, the detoxification of organic pollutants, such as organic dyes, is fundamental. New functionalized alginate-based hydrogel was prepared via crosslinking of branched polyethyleneimine (PEIm) onto dialdehyde alginate (DAlg) through a Schiff base formation, constructing a promising DAlg/PEIm hydrogel. The structural characterization by FTIR, XRD, SEM, and elemental mapping confirmed the successful synthesis of DAlg and DAlg/PEIm and revealed the hydrogel material’s enhanced structural integrity and functionalization. Thermal stability analysis further demonstrated the improved robustness of DAlg/PEIm hydrogel compared to DAlg. Alginate-based hydrogel was evaluated as novel adsorbent for the elimination of anionic dyes from aqueous solutions. Batch adsorption examinations were performed to examine the methyl orange, MO, adsorption capacity under various pH, dye concentration, and contact time conditions. DAlg/PEIm hydrogel demonstrated exceptional adsorption capacity and rapid kinetics. The adsorption process of DAlg/PEIm hydrogel followed the Langmuir and the pseudo-second-order models, and the maximum adsorption is 405 mg/g. The study highlights the potential of DAlg/PEIm hydrogel as effective and sustainable adsorbents for wastewater treatment applications.</p>

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Polyethyleneimine/oxidized alginate hydrogels: A sustainable approach for anionic dye removal

  • 期刊论文

  • 发表日期：

    2025年3月6日

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  • Zeineb Hamden,
  • Mahmoud A. Abdelaziz,
  • Ali A. Keshk,
  • Fatimah A. Alotaibi,
  • Ibtisam Alali,
  • Nada Alhathlaul,
  • Rasha Jame,
  • Medhat E. Owda

摘要

Water pollution is a critical ecological problem and subsequently, the detoxification of organic pollutants, such as organic dyes, is fundamental. New functionalized alginate-based hydrogel was prepared via crosslinking of branched polyethyleneimine (PEIm) onto dialdehyde alginate (DAlg) through a Schiff base formation, constructing a promising DAlg/PEIm hydrogel. The structural characterization by FTIR, XRD, SEM, and elemental mapping confirmed the successful synthesis of DAlg and DAlg/PEIm and revealed the hydrogel material’s enhanced structural integrity and functionalization. Thermal stability analysis further demonstrated the improved robustness of DAlg/PEIm hydrogel compared to DAlg. Alginate-based hydrogel was evaluated as novel adsorbent for the elimination of anionic dyes from aqueous solutions. Batch adsorption examinations were performed to examine the methyl orange, MO, adsorption capacity under various pH, dye concentration, and contact time conditions. DAlg/PEIm hydrogel demonstrated exceptional adsorption capacity and rapid kinetics. The adsorption process of DAlg/PEIm hydrogel followed the Langmuir and the pseudo-second-order models, and the maximum adsorption is 405 mg/g. The study highlights the potential of DAlg/PEIm hydrogel as effective and sustainable adsorbents for wastewater treatment applications.