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<p>This study developed an environmentally friendly, dual-physically crosslinked polyacrylamide/sodium carboxymethyl cellulose/sodium alginate-Kaolin-Fe<sup>3+</sup> (PAM/CMC/SA-Kaolin-Fe<sup>3+</sup>) composite hydrogel for efficient dye removal in water treatment. The hydrogel was constructed through hydrogen bonding between kaolin and polyacrylamide, combined with Fe<sup>3+</sup> ion coordination with SA/CMC, achieving synergistic structural reinforcement. Results demonstrated a dense, uniform 3D interpenetrating network. Increasing Fe<sup>3+</sup> concentration from 0.1 to 0.9&#xa0;mol/L significantly enhanced mechanical properties, doubling compressive strength and reducing swelling by approximately 50%, confirming improved network stability. The hydrogel exhibited exceptional methylene blue (MB) adsorption capacity (562.5&#xa0;mg/g at 180&#xa0;mg/L), following pseudo-second-order kinetics, facilitated by abundant adsorption sites and Fe<sup>3+</sup> coordination synergy. Critically, the material maintained over 50% of its initial adsorption capacity through four consecutive cycles, demonstrating excellent regenerability. These findings establish this dual physically crosslinked hydrogel as a highly effective, reusable adsorbent and provide a promising design strategy for sustainable water treatment materials.</p>

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Synthesis of dual physically crosslinked PAM/CMC/SA-Kaolin-Fe3+ hydrogels for methylene blue adsorption

  • 期刊论文

  • 发表日期：

    2025年12月6日

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  • Xiangpeng Wang,
  • Yunxiang Zheng,
  • Chunxiao Zhang,
  • Chunmao Chen

摘要

This study developed an environmentally friendly, dual-physically crosslinked polyacrylamide/sodium carboxymethyl cellulose/sodium alginate-Kaolin-Fe3+ (PAM/CMC/SA-Kaolin-Fe3+) composite hydrogel for efficient dye removal in water treatment. The hydrogel was constructed through hydrogen bonding between kaolin and polyacrylamide, combined with Fe3+ ion coordination with SA/CMC, achieving synergistic structural reinforcement. Results demonstrated a dense, uniform 3D interpenetrating network. Increasing Fe3+ concentration from 0.1 to 0.9 mol/L significantly enhanced mechanical properties, doubling compressive strength and reducing swelling by approximately 50%, confirming improved network stability. The hydrogel exhibited exceptional methylene blue (MB) adsorption capacity (562.5 mg/g at 180 mg/L), following pseudo-second-order kinetics, facilitated by abundant adsorption sites and Fe3+ coordination synergy. Critically, the material maintained over 50% of its initial adsorption capacity through four consecutive cycles, demonstrating excellent regenerability. These findings establish this dual physically crosslinked hydrogel as a highly effective, reusable adsorbent and provide a promising design strategy for sustainable water treatment materials.