Sustainable sodium alginate-La-Al-MOFs composite beads with enhanced mechanical strength for fluoride removal

Song, Z; Wang, Z; Yang, F; Ngo, HH; Guo, W; Zhang, X

Sustainable sodium alginate-La-Al-MOFs composite beads with enhanced mechanical strength for fluoride removal

Song, Z Wang, Z Yang, F Ngo, HH Guo, W

Zhang, X

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Journal of Water Process Engineering, 2025, 80, pp. 109152
Issue Date:: 2025-12-01

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Field	Value	Language
dc.contributor.author	Song, Z
dc.contributor.author	Wang, Z
dc.contributor.author	Yang, F
dc.contributor.author	Ngo, HH
dc.contributor.author	Guo, W https://orcid.org/0000-0001-5542-2858
dc.contributor.author	Zhang, X
dc.date.accessioned	2026-01-27T10:45:00Z
dc.date.available	2026-01-27T10:45:00Z
dc.date.issued	2025-12-01
dc.identifier.citation	Journal of Water Process Engineering, 2025, 80, pp. 109152
dc.identifier.issn	2214-7144
dc.identifier.issn	2214-7144
dc.identifier.uri	http://hdl.handle.net/10453/192436
dc.description.abstract	Excessive fluoride has detrimental effects on human health and contributes to the contamination of aquatic and terrestrial environments. However, conventional powdered fluoride adsorbents often suffer from challenges such as poor recyclability and secondary pollution. Herein, a bimetallic Metal-organic frameworks (MOF) composite was synthesized employing a hydrothermal method and then embedded in sodium alginate to form sodium alginate-La-Al-MOFs composite beads (SAMB) gel spherical material. The fluoride adsorption performance of SAMB was systematically evaluated under varying conditions. SAMB demonstrated strong removal performance over an extensive pH spectrum, ranging from 3 to 9, with optimal performance observed at pH 3. At an initial fluoride concentration of 20 mg/L and an adsorbent dosage of 1 g/L, SAMB achieved a maximum fluorine removal efficiency of 87.6 %. Fluoride adsorption followed monomolecular layer chemisorption as confirmed by Langmuir and pseudo-secondary kinetics. The large surface pores of SAMB enabled rapid removal of fluoride within 15 min with a maximum adsorption capacity of 46.67 mg/g at 298.15 K. Regeneration experiments displayed the adsorption efficiency of the gel spheres adsorbent only decreased by 29 % after four times of reuse. The adsorption mechanism revealed that SAMB fluorine adsorption was dominated by ion exchange and electrostatic attraction. These findings demonstrate that SAMB serves as an effective and environmentally benign adsorbent for aqueous fluoride removal, offering a sustainable alternative to conventional treatment methods.
dc.language	en
dc.publisher	Elsevier
dc.relation.ispartof	Journal of Water Process Engineering
dc.relation.isbasedon	10.1016/j.jwpe.2025.109152
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0905 Civil Engineering, 0907 Environmental Engineering
dc.subject.classification	4004 Chemical engineering
dc.subject.classification	4005 Civil engineering
dc.subject.classification	4011 Environmental engineering
dc.title	Sustainable sodium alginate-La-Al-MOFs composite beads with enhanced mechanical strength for fluoride removal
dc.type	Journal Article
utslib.citation.volume	80
utslib.for	0905 Civil Engineering
utslib.for	0907 Environmental Engineering
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	University of Technology Sydney/UTS Groups
pubs.organisational-group	University of Technology Sydney/UTS Groups/Centre for Technology in Water and Wastewater (CTWW)
utslib.copyright.status	open_access	*
dc.rights.license	This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0). To view a copy of this license, visit https://creativecommons.org/licenses/by/4.0/
dc.date.updated	2026-01-27T10:44:58Z
pubs.publication-status	Published
pubs.volume	80

Abstract:

Excessive fluoride has detrimental effects on human health and contributes to the contamination of aquatic and terrestrial environments. However, conventional powdered fluoride adsorbents often suffer from challenges such as poor recyclability and secondary pollution. Herein, a bimetallic Metal-organic frameworks (MOF) composite was synthesized employing a hydrothermal method and then embedded in sodium alginate to form sodium alginate-La-Al-MOFs composite beads (SAMB) gel spherical material. The fluoride adsorption performance of SAMB was systematically evaluated under varying conditions. SAMB demonstrated strong removal performance over an extensive pH spectrum, ranging from 3 to 9, with optimal performance observed at pH 3. At an initial fluoride concentration of 20 mg/L and an adsorbent dosage of 1 g/L, SAMB achieved a maximum fluorine removal efficiency of 87.6 %. Fluoride adsorption followed monomolecular layer chemisorption as confirmed by Langmuir and pseudo-secondary kinetics. The large surface pores of SAMB enabled rapid removal of fluoride within 15 min with a maximum adsorption capacity of 46.67 mg/g at 298.15 K. Regeneration experiments displayed the adsorption efficiency of the gel spheres adsorbent only decreased by 29 % after four times of reuse. The adsorption mechanism revealed that SAMB fluorine adsorption was dominated by ion exchange and electrostatic attraction. These findings demonstrate that SAMB serves as an effective and environmentally benign adsorbent for aqueous fluoride removal, offering a sustainable alternative to conventional treatment methods.

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http://hdl.handle.net/10453/192436