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Crosslinked modified chitosan biopolymer for enhanced removal of toxic Cr(VI) from aqueous solution.
Int J Biol Macromol. 2023 Apr 15; 234:123719.IJ

Abstract

Two new crosslinked modified chitosan biopolymers, namely (CTS-VAN) and (Fe3O4@CTS-VAN) bioadsorbents were prepared starting from chitosan and 4-hydroxy-3-methoxybenzaldehyde (VAN) in presence of epichlorohydrin. The analytical techniques FT-IR, EDS, XRD, SEM and XPS besides BET surface analysis were utilized for full characterization of the bioadsorbents. Batch experiments were conducted to study the effect of various influencing parameters in Cr (VI) removal such as initial pH, contact time, adsorbent amount and initial Cr (VI) concentration. The adsorption of Cr (VI) was found out to be maximum at pH = 3 for both bioadsorbents. Langmuir isotherm fit well the adsorption process with a maximum adsorption capacity of 188.68 and 98.04 mg/g for CTS-VAN and Fe3O4@CTS-VAN, respectively. The adsorption process followed pseudo second-order kinetics with R2 values of 1 and 0.9938 for CTS-VAN and Fe3O4@CTS-VAN, respectively. X-ray photoelectron spectroscopy (XPS) analysis showed that Cr(III) accounted for 83 % of the total Cr bound to bioadsorbents surface, which indicated reductive adsorption was responsible for Cr(VI) removal by the bioadsorbents. Cr(VI) was initially adsorbed on the positively charged surface of the bioadsorbents and reduced to Cr(III) by electrons provided by oxygen-comprising functional groups (e.g., CO), and consequently part of the converted Cr(III) stayed on the surface and the rest released into solution.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Khalil TE
Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt. Electronic address: tarekakel@alexu.edu.eg.
Abdel-Salam AH
Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt; Chemistry Department, Faculty of Science, University of Jeddah, P.O. Box 80327, Jeddah 21589, Saudi Arabia.
Mohamed LA
National Institute of Oceanography and Fisheries(NIOF), Egypt.
El-Meligy E
Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt.
El-Dissouky A
Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt.

MeSH

Water Pollutants, ChemicalChitosanSpectroscopy, Fourier Transform InfraredChromiumWaterAdsorptionKineticsHydrogen-Ion Concentration

Pub Type(s)

Journal Article

Language

eng

PubMed ID

36801217

Citation

Khalil, Tarek E., et al. "Crosslinked Modified Chitosan Biopolymer for Enhanced Removal of Toxic Cr(VI) From Aqueous Solution." International Journal of Biological Macromolecules, vol. 234, 2023, p. 123719.
Khalil TE, Abdel-Salam AH, Mohamed LA, et al. Crosslinked modified chitosan biopolymer for enhanced removal of toxic Cr(VI) from aqueous solution. Int J Biol Macromol. 2023;234:123719.
Khalil, T. E., Abdel-Salam, A. H., Mohamed, L. A., El-Meligy, E., & El-Dissouky, A. (2023). Crosslinked modified chitosan biopolymer for enhanced removal of toxic Cr(VI) from aqueous solution. International Journal of Biological Macromolecules, 234, 123719. https://doi.org/10.1016/j.ijbiomac.2023.123719
Khalil TE, et al. Crosslinked Modified Chitosan Biopolymer for Enhanced Removal of Toxic Cr(VI) From Aqueous Solution. Int J Biol Macromol. 2023 Apr 15;234:123719. PubMed PMID: 36801217.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Crosslinked modified chitosan biopolymer for enhanced removal of toxic Cr(VI) from aqueous solution. AU - Khalil,Tarek E, AU - Abdel-Salam,Ahmed H, AU - Mohamed,Laila A, AU - El-Meligy,Esraa, AU - El-Dissouky,Ali, Y1 - 2023/02/16/ PY - 2022/12/03/received PY - 2023/01/27/revised PY - 2023/02/13/accepted PY - 2023/2/22/pubmed PY - 2023/2/22/medline PY - 2023/2/21/entrez KW - Bioadsorbents KW - Cr(VI) KW - Crosslinked KW - Equilibrium KW - Kinetic KW - Modified chitosan SP - 123719 EP - 123719 JF - International journal of biological macromolecules JO - Int J Biol Macromol VL - 234 N2 - Two new crosslinked modified chitosan biopolymers, namely (CTS-VAN) and (Fe3O4@CTS-VAN) bioadsorbents were prepared starting from chitosan and 4-hydroxy-3-methoxybenzaldehyde (VAN) in presence of epichlorohydrin. The analytical techniques FT-IR, EDS, XRD, SEM and XPS besides BET surface analysis were utilized for full characterization of the bioadsorbents. Batch experiments were conducted to study the effect of various influencing parameters in Cr (VI) removal such as initial pH, contact time, adsorbent amount and initial Cr (VI) concentration. The adsorption of Cr (VI) was found out to be maximum at pH = 3 for both bioadsorbents. Langmuir isotherm fit well the adsorption process with a maximum adsorption capacity of 188.68 and 98.04 mg/g for CTS-VAN and Fe3O4@CTS-VAN, respectively. The adsorption process followed pseudo second-order kinetics with R2 values of 1 and 0.9938 for CTS-VAN and Fe3O4@CTS-VAN, respectively. X-ray photoelectron spectroscopy (XPS) analysis showed that Cr(III) accounted for 83 % of the total Cr bound to bioadsorbents surface, which indicated reductive adsorption was responsible for Cr(VI) removal by the bioadsorbents. Cr(VI) was initially adsorbed on the positively charged surface of the bioadsorbents and reduced to Cr(III) by electrons provided by oxygen-comprising functional groups (e.g., CO), and consequently part of the converted Cr(III) stayed on the surface and the rest released into solution. SN - 1879-0003 UR - https://www.unboundmedicine.com/medline/citation/36801217/Crosslinked_modified_chitosan_biopolymer_for_enhanced_removal_of_toxic_Cr_VI__from_aqueous_solution_ DB - PRIME DP - Unbound Medicine ER -