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.

WATER AIR AND SOIL POLLUTION

SPRINGER

Año: 2022 vol. 233

0049-6979

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