Enhancement of water absorption properties of potassium polyacrylate-based hydrogels in CaCl2-rich soils using potassium di- and tri-carboxylate salts

Enhancement of water absorption properties of potassium polyacrylate-based hydrogels in CaCl2-rich soils using potassium di- and tri-carboxylate salts

A series of potassium polyacrylate hydrogels (KPAHs) hyperabsorbents of water 0.08, 0.21, and 0.46 wt% of triethylene glycol dimethacrylate (TEGDMA) crosslinker were prepared by a free radical polymerization route of potassium acrylate in the presence of TEGDMA in deionized water. The prepared KPAHs...

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Main Authors: Al Khulaifi Rana Salem, Alqahtani Saad Mohammed, Saeed Waseem Sharaf, Sayagh Mohamed Moncef, Haidyrah Ahmed S., Al-Owais Ahmad Abdulaziz, Al-Wabel Mohammad I., Aouak Taieb
Format: Article
Language:English
Published: De Gruyter 2025-05-01
Series:Open Chemistry
Subjects:
hydrogel hyperabsorbent
potassium polyacrylate
potassium di- and tri-carboxylates
swelling capacity
cacl2/water medium
Online Access:https://doi.org/10.1515/chem-2025-0159
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Summary:A series of potassium polyacrylate hydrogels (KPAHs) hyperabsorbents of water 0.08, 0.21, and 0.46 wt% of triethylene glycol dimethacrylate (TEGDMA) crosslinker were prepared by a free radical polymerization route of potassium acrylate in the presence of TEGDMA in deionized water. The prepared KPAHs were characterized by Fourier-transform infra-red spectroscopy, differential scanning calorimetry, X-ray diffraction, and scanning electron microscopy. The aim of this study is to improve the water absorbability of KPAH in heavily loaded soils containing 3–9 g L‒1 CaCl2. To achieve this goal, potassium di- and tri-carboxylate salts were in situ separatly incorporated at different contents in the KPAHs in order to recover the swellability of these hydrogels lost due to the excessive presence of CaCl2 in the soil. Among the most significant results obtained it was revealed that the best absorbability in water containing CaCl2 is obtained by the KPAH hydrogel containing 0.08 wt% of TEGDMA. When the dipotassium oxalate is added to the KPAH (1:4.5 by weight) this hydrogel resists the shrinkage in 3 g L−1 CaCl2 saline water. It was also found that the hydrogel system containing 0.21 wt% crosslinker and KO (1:13.5 by weight) showed the best performance in the swellability in the higher saline water (9 g L−1 CaCl2).
ISSN:2391-5420

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