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<p>Water scarcity is a pressing issue in several regions of the world. Nevertheless, atmospheric water vapor offers an abundant freshwater source that is constantly renewed through the hydrological cycle. Among water harvesting technologies, Sorption-based methods, which involve sorbents to capture water vapor and heat to release the sorbed water, have proven its effectiveness for collecting moisture. This study introduced a novel type of sorbent hydrogel made from natural, cost-effective, and non-toxic polysaccharide polymer. The hydrogel was prepared by grafting partially neutralized acrylic acid (AA) monomers onto Xanthan Gum (XG) using N, N′-methylene-bis-acrylamide (N-MBA) as a crosslinker and potassium persulfate as an initiator. Characterization was done using FTIR, SEM, TGA, and XRD. It was found that the swelled sample showed a higher value of water uptake which reached to about 50% of their maximum swelling capacity at the first 3&#xa0;min. Moreover, the water uptake of the hydrogel increased as the amount of AA and CaCl<sub>2</sub> increased up to a certain value and decreased beyond this value. While, increasing the concentration of N-MBA led to decreasing the water uptake. Finally, over 94% of the sorbed water being rapidly released. While, the hydrogel showed excellent reusability without noticeable fading.</p>

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Recyclable and eco-friendly xanthan gum-based hygroscopic hydrogel for atmospheric water harvesting

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年11月17日

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  • A’laa Mohamed Safwat,
  • Mohamed Abd-Elzaher,
  • I. H. Saleh,
  • Moataz Soliman,
  • Wagih Abdel‑Alim Sadik

摘要

Water scarcity is a pressing issue in several regions of the world. Nevertheless, atmospheric water vapor offers an abundant freshwater source that is constantly renewed through the hydrological cycle. Among water harvesting technologies, Sorption-based methods, which involve sorbents to capture water vapor and heat to release the sorbed water, have proven its effectiveness for collecting moisture. This study introduced a novel type of sorbent hydrogel made from natural, cost-effective, and non-toxic polysaccharide polymer. The hydrogel was prepared by grafting partially neutralized acrylic acid (AA) monomers onto Xanthan Gum (XG) using N, N′-methylene-bis-acrylamide (N-MBA) as a crosslinker and potassium persulfate as an initiator. Characterization was done using FTIR, SEM, TGA, and XRD. It was found that the swelled sample showed a higher value of water uptake which reached to about 50% of their maximum swelling capacity at the first 3 min. Moreover, the water uptake of the hydrogel increased as the amount of AA and CaCl2 increased up to a certain value and decreased beyond this value. While, increasing the concentration of N-MBA led to decreasing the water uptake. Finally, over 94% of the sorbed water being rapidly released. While, the hydrogel showed excellent reusability without noticeable fading.