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<p>The treatment of dye wastewater necessitates efficient and sustainable adsorbents. In this study, a novel sodium alginate/carrageenan/montmorillonite@carboxymethyl cellulose nanofiber (SA/CRG/MMt@CMCNF) core-shell hydrogel, containing abundant adsorption sites, was synthesized via a facile ion-crosslinking method for effective methylene blue (MB) removal. The surface characteristics including morphology, functional groups, and pore distribution of the SA/CRG/MMt@CMCNF hydrogel were analyzed. FTIR, BET, and XPS analyses revealed that the addition of MMt provided more adsorption sites. The composite hydrogel exhibited a maximum adsorption capacity of 228.83 mg·g<sup>− 1</sup> under optimal conditions and was well-described by both the pseudo-second-order kinetic model and Langmuir isotherm model. Furthermore, it maintained 75% MB removal efficiency after five adsorption cycles. To our knowledge, this study introduces the first incorporation of CMCNF and MMt into the SA/CRG composite system to form a core-shell hydrogel for MB adsorption. Overall, the SA/CRG/MMt@CMCNF hydrogel offers several advantages, including a simple production process, low cost, high adsorption capacity, and good recyclability. This research presents a design strategy for multifunctional hydrogel composites incorporating nanomaterials, providing novel insights into the development of dye treatment technologies.</p> Graphical abstract <p></p>

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Facile synthesis of sodium alginate-based/nano-montmorillonite composite core-shell hydrogels for effective removal of methylene blue

  • 期刊论文

  • 发表日期：

    2025年11月19日

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  • Yuxuan Han,
  • Yizhong Yuan,
  • Jinyu Sun,
  • Xiaohui Tian,
  • Huimei Yu

摘要

The treatment of dye wastewater necessitates efficient and sustainable adsorbents. In this study, a novel sodium alginate/carrageenan/montmorillonite@carboxymethyl cellulose nanofiber (SA/CRG/MMt@CMCNF) core-shell hydrogel, containing abundant adsorption sites, was synthesized via a facile ion-crosslinking method for effective methylene blue (MB) removal. The surface characteristics including morphology, functional groups, and pore distribution of the SA/CRG/MMt@CMCNF hydrogel were analyzed. FTIR, BET, and XPS analyses revealed that the addition of MMt provided more adsorption sites. The composite hydrogel exhibited a maximum adsorption capacity of 228.83 mg·g− 1 under optimal conditions and was well-described by both the pseudo-second-order kinetic model and Langmuir isotherm model. Furthermore, it maintained 75% MB removal efficiency after five adsorption cycles. To our knowledge, this study introduces the first incorporation of CMCNF and MMt into the SA/CRG composite system to form a core-shell hydrogel for MB adsorption. Overall, the SA/CRG/MMt@CMCNF hydrogel offers several advantages, including a simple production process, low cost, high adsorption capacity, and good recyclability. This research presents a design strategy for multifunctional hydrogel composites incorporating nanomaterials, providing novel insights into the development of dye treatment technologies.

Graphical abstract