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Sodium-alginate/poly (acrylamide co-acrylic acid) semi-interpenetrating hydrogels for removal of heavy metals from aqueous solutions

  • Taha Yakoub Bakel , Yassine Berbar , Naima Bouslah EMAIL logo , Miguel Díaz-Sánchez ORCID logo , Nabila Haddadine , Santiago Gómez-Ruiz and Mohamed Trari
Published/Copyright: April 7, 2025
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Abstract

Water contamination by heavy metals is a serious ecological problem due to their toxicity to humans, animals and plants. The synthesis of new low-cost adsorbents used in the treatment of polluted water is therefore generating growing interest. In this work, the synthesis of semi-interpenetrating network (SIPN) hydrogels by in-situ free radical polymerization was carried out. Materials based on poly(acrylamide-co- acrylic acid) and different ratios of sodium alginate (Alg-Na) have been prepared to examine their potential use in wastewater treatment. The swelling capabilities of these materials were evaluated observing a general trend of low swelling in acidic pH solutions and more significant swelling in solutions with a pH above 5. The structure and morphology of the hydrogels were investigated using X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy. The adsorption capacity of the hydrogels for metal ions Pb2+, Cd2+, and Cr3+ was studied in aqueous media containing different concentrations of these ions (25–100 ppm). The results showed that the hydrogels have great potential for heavy metal removal from aqueous solutions concluding also that the addition of Alg-Na enhances the metal uptake.


Corresponding author: Naima Bouslah, Laboratory of Macromolecular and Thio-Organic Macromolecular Synthesis, Faculty of Chemistry, University of Science and Technology Houari Boumediène USTHB, BP 32 El Alia, 16111 Algiers, Algeria, E-mail:

Funding source: funding from the research project PID2022-136417NB-I00 financed by MCIU/AEI/10.13039/501100011033/ and “ERDF A way of making Europe

Award Identifier / Grant number: funding from the research project PID2022-136417NB

Acknowledgments

Taha. Yakoub. Bakel would like to thank Prof. Arous Omar for the constructive discussions. The authors are grateful to the DGRSDT/MESRS in Algeria for supporting this research.

  1. Research ethics: Not applicable.

  2. Informed consent: Not applicable.

  3. Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.

  4. Use of Large Language Models, AI and Machine Learning Tools: None declared.

  5. Conflict of interest: The authors state no conflict of interest.

  6. Research funding: The authors like to thank funding from the research project PID2022-136417NB-I00 financed by MCIU/AEI/10.13039/501100011033/ and “ERDF A way of making Europe”.

  7. Data availability: Not applicable.

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Received: 2025-01-29
Accepted: 2025-03-17
Published Online: 2025-04-07
Published in Print: 2025-05-26

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