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Applied Sciences
Volume 15
Issue 14
10.3390/app15147829
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Aluminum-Loaded Bifunctional Resins for Efficient Fluoride Removal from Aqueous Solutions

by
Mengfei Ma
,
Yingpeng Gu
,
Ruijie Wang
and
Yue Sun
*
Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing 210096, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2025, 15(14), 7829; https://doi.org/10.3390/app15147829 (registering DOI)
Submission received: 18 June 2025 / Revised: 8 July 2025 / Accepted: 10 July 2025 / Published: 12 July 2025
(This article belongs to the Special Issue Advances in Pollutant Removal from Water Environments)
Versions Notes

Abstract

The deep defluorination of water remains a significant environmental challenge. In this work, aluminum was loaded onto the bifunctional resin S957 containing a phosphoric-sulfonic acid difunctional group for efficient fluoride removal. Al-S957 demonstrated excellent fluoride removal performance across a broad pH range. When anions and organics coexisted, Al-S957 exhibited significantly better fluoride adsorption performance compared to aluminum-loaded monofunctional resins. The adsorption followed an endothermic chemisorption process on a monolayer surface. FTIR and XPS analyses further revealed that fluoride removal relied on a ligand exchange mechanism. Column adsorption conducted over five cycles highlighted the strong practical potential of Al-S957. The results suggested that Al-S957 exhibits significant potential for practical applications.
Keywords: aluminum; resin; fluoride removal; adsorption; ligand exchange aluminum; resin; fluoride removal; adsorption; ligand exchange

Share and Cite

MDPI and ACS Style

Ma, M.; Gu, Y.; Wang, R.; Sun, Y. Aluminum-Loaded Bifunctional Resins for Efficient Fluoride Removal from Aqueous Solutions. Appl. Sci. 2025, 15, 7829. https://doi.org/10.3390/app15147829

AMA Style

Ma M, Gu Y, Wang R, Sun Y. Aluminum-Loaded Bifunctional Resins for Efficient Fluoride Removal from Aqueous Solutions. Applied Sciences. 2025; 15(14):7829. https://doi.org/10.3390/app15147829

Chicago/Turabian Style

Ma, Mengfei, Yingpeng Gu, Ruijie Wang, and Yue Sun. 2025. "Aluminum-Loaded Bifunctional Resins for Efficient Fluoride Removal from Aqueous Solutions" Applied Sciences 15, no. 14: 7829. https://doi.org/10.3390/app15147829

APA Style

Ma, M., Gu, Y., Wang, R., & Sun, Y. (2025). Aluminum-Loaded Bifunctional Resins for Efficient Fluoride Removal from Aqueous Solutions. Applied Sciences, 15(14), 7829. https://doi.org/10.3390/app15147829

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