Volume 140, Issue 21 e53886
RESEARCH ARTICLE

Efficient removal of Cr(VI) from aqueous solutions using chitosan/Na-alginate bio-based nanocomposite hydrogel

Ghada A. Mahmoud

Ghada A. Mahmoud

Polymer Chemistry Department, National Center for Radiation Research and Technology, Egyptian Atomic Energy Authority, Cairo, Egypt

Contribution: Formal analysis (supporting), ​Investigation (supporting), Supervision (lead), Visualization (equal), Writing - original draft (equal), Writing - review & editing (lead)

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Asmaa Sayed

Corresponding Author

Asmaa Sayed

Polymer Chemistry Department, National Center for Radiation Research and Technology, Egyptian Atomic Energy Authority, Cairo, Egypt

Correspondence

Asmaa Sayed, Polymer Chemistry Department, National Center for Radiation Research and Technology, Egyptian Atomic Energy Authority, Cairo, Egypt.

Email: [email protected]

Contribution: Conceptualization (lead), Data curation (lead), Formal analysis (lead), ​Investigation (equal), Methodology (equal), Software (lead), Writing - original draft (equal)

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Manar El-Sayed Abdel-raouf

Manar El-Sayed Abdel-raouf

Egyptian Petroleum Research Institute, Cairo, Egypt

Contribution: Formal analysis (lead), Supervision (lead), Writing - original draft (lead), Writing - review & editing (lead)

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Mina Y. F. Danial

Mina Y. F. Danial

Faculty of Biotechnology, October University for Modern Sciences and Arts (MSA), Giza, Egypt

Contribution: Conceptualization (equal), Data curation (equal), Formal analysis (equal), Methodology (equal)

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Ayman Amin

Ayman Amin

Faculty of Agriculture, Cairo University, Cairo, Egypt

Contribution: Supervision (equal), Validation (equal), Visualization (equal)

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First published: 24 March 2023
Citations: 6

Abstract

This research article aimed to assist the works conducted to save water resources, which are rapidly depleted as a result of climate change by eliminating toxic chromium ions Cr(VI) from simulated solution. In this regard, chitosan/Na-alginate/polyacrylic acid (CS/Na-Alg/PAAc) and Ni/chitosan/Na-alginate/polyacrylic acid (Ni@CS/Na-Alg/PAAc) were created as eco-friendly hydrogel composites via gamma radiation. The hydrogel matrix served as a basin for the in-situ formation of Ni nanoparticles. The prepared composites were characterized by the FTIR and XRD analyses. The surface morphology of the nanocomposite was also verified via the SEM. It exhibited a dense packing of the Ni nanoparticles representing about 2.5% of the atomic percentage depicted by the EDX analysis. The swelling performance was investigated versus different pH values and the maximum swelling percent was attained as a non-Fickian character at pH = 13 and 5 for CS/Na-Alg/PAAc and Ni@CS/Na-Alg/PAAc, respectively. Furthermore, the surface topographies of CS/Na-Alg/PAAc and Ni@CS/Na-Alg/PAAc loaded with Cr(VI) were examined by AFM at different pH values. The maximum Cr(VI) removal was top achieved at pH 8 (58.06 and 74.5 mg/g for CS/Na-Alg/PAAc and Ni@CS/Na-Alg/PAAc, respectively) and best fit with the Freundlich isotherm model with calculated RL values indicated a favorable adsorption.

CONFLICT OF INTEREST STATEMENT

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

DATA AVAILABILITY STATEMENT

The authors declare that all data supporting the findings and materials of this study are included within the paper.

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