Development of magnetically separable metal oxide-based adsorbents for the removal of cationic dyes from water
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2024-09
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Benemérita Universidad Autónoma de Puebla
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“In this work, core-shell nanoparticles were synthesized for application in the adsorption and removal of cationic dyes from contaminated water. The core consists of spherical magnetite (Fe3O4) primary particles of approximately 15 nm in diameter, agglomerated into spheroids of approximately 250 nm in diameter. The shell consists of a porous, amorphous layer of mixed oxides of titanium and silicon (Ti1-xSixO2). Magnetite cores were obtained by solvothermal synthesis using a single iron precursor and ethylene glycol as reducing agent. Amorphous and porous shell growth was performed by sol-gel technique varying the Si mole fraction (x=0,0.25,0.5 and 1) in the reaction solutions. For their use in the adsorption of cationic dyes, the surface charge of the nanoparticles (potential ζ) was evaluated by electrophoresis, and the specific surface area by N2 adsorption isotherms at 77 K. The fabricated nanostructures were evaluated for their adsorption capacity for cationic dyes of organic nature such as methylene blue (MB) and rhodamine b (RB). It was found that the nanostructures with x=0.25 have better performance adsorbing both dyes. The sample of composition Ti0.75Si0.25O2 revealed its ability to adsorb up to 93.18 mg MB and 36.2 mg RB per gram unit in 90 min of exposure”.
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