Comparison of the Capacity of Fluoride Adsorption and Recycling Ability of Al(OH)3-Coated Iron Oxide Nanoparticles Prepared by Different Methods

Morán Ayala, Lucía I.; Andrini, Leandro; Carlos, Luciano; Bosio, Gabriela N.; Mártire, Daniel O.

Comparison of the Capacity of Fluoride Adsorption and Recycling Ability of Al(OH)3-Coated Iron Oxide Nanoparticles Prepared by Different Methods

2022

Morán Ayala, Lucía I. | Andrini, Leandro | Carlos, Luciano | Bosio, Gabriela N. | Mártire, Daniel O.

Removal of fluoride from wastewater is crucial to avoid excess accumulation of fluoride in the environment, which causes harm to humans. In this work, we performed a comparison study in which four different core–shell magnetic nanoadsorbents of fluoride ions were synthesized, characterized, and tested: NP1@Al(OH)₃AQ, NP1@Al(OH)₃ORG, NP2@Al(OH)₃AQ, and NP2@Al(OH)₃ORG. NP1 and NP2 stand for iron oxide nanoparticles prepared via the co-precipitation method and via thermal decomposition of organic precursors, respectively. AQ and ORG refer to the aqueous or organic media employed for the synthesis of the Al(OH)₃ shell. Although the nanomaterials containing the NP2 core showed higher adsorption capacity, a result in line with the higher content of Al(OH)₃ of these NPs, NP1@Al(OH)₃AQ were the only nanoparticles which could be regenerated and reused after fluoride desorption in alkaline medium. Pre-incubation of HepG2 cells exposed to fluoride ion with NP1@Al(OH)₃AQ and NP2@Al(OH)₃AQ produced a further recovery of cell’s viability. Cell viability tests performed with both NPs after 1, 2, or 3 uses showed a decrease in protection with increasing number of uses. In addition, NP1@Al(OH)₃ responded better to cellular protection, in good agreement with results obtained in vitro in the absence of biological material.

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