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<p>Water pollution poses a severe threat to human health and ecological systems, thereby demanding high-performance adsorbents for wastewater treatment. Herein, a novel composite hydrogel (CA-β-CD/P(AA-co-AM)) was synthesized via radical polymerization using citric acid-modified β-CD (CA-β-CD). Citric acid modification introduced functional sites, tuned cavity structure, and linked β-CD units into oligomer, overcoming native β-CD’s limitations to serve as an ideal hydrogel component. The incorporation of CA-β-CD into P(AA-co-AM) formed a porous network, enabled synergistic interactions, enhanced stability, and integrated CA-β-CD’s adsorption superiority with the polymer’s robust matrix. The structure and properties of the composite hydrogel were characterized by FT-IR, <sup>1</sup>H NMR, SEM, TGA, GPC, and XPS. It showed outstanding methylene blue (MB) adsorption via host–guest inclusion, hydrogen bonding, and electrostatic interactions, with a maximum capacity of 3743.23&#xa0;mg/g. Adsorption followed pseudo-second-order kinetics and Langmuir isotherm, with rate controlled by intra-particle and liquid film diffusion. Importantly, the composite hydrogel maintained excellent reusability — after 10 consecutive adsorption–desorption cycles, the MB removal rate (R) remained above 92%. This work provides a promising strategy for cyclodextrin-derived adsorbents in dye wastewater treatment.&#xa0;</p> Graphical Abstract <p></p>

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Preparation of citric acid-modified β-cyclodextrin/poly (acrylic acid-co-acrylamide) composite hydrogel for enhanced methylene blue adsorption

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Ayiguzaili Abudiwayiti,
  • Amatjan Sawut,
  • Rena Simayi,
  • Long Cheng

摘要

Water pollution poses a severe threat to human health and ecological systems, thereby demanding high-performance adsorbents for wastewater treatment. Herein, a novel composite hydrogel (CA-β-CD/P(AA-co-AM)) was synthesized via radical polymerization using citric acid-modified β-CD (CA-β-CD). Citric acid modification introduced functional sites, tuned cavity structure, and linked β-CD units into oligomer, overcoming native β-CD’s limitations to serve as an ideal hydrogel component. The incorporation of CA-β-CD into P(AA-co-AM) formed a porous network, enabled synergistic interactions, enhanced stability, and integrated CA-β-CD’s adsorption superiority with the polymer’s robust matrix. The structure and properties of the composite hydrogel were characterized by FT-IR, 1H NMR, SEM, TGA, GPC, and XPS. It showed outstanding methylene blue (MB) adsorption via host–guest inclusion, hydrogen bonding, and electrostatic interactions, with a maximum capacity of 3743.23 mg/g. Adsorption followed pseudo-second-order kinetics and Langmuir isotherm, with rate controlled by intra-particle and liquid film diffusion. Importantly, the composite hydrogel maintained excellent reusability — after 10 consecutive adsorption–desorption cycles, the MB removal rate (R) remained above 92%. This work provides a promising strategy for cyclodextrin-derived adsorbents in dye wastewater treatment. 

Graphical Abstract