TiO2 films on CoFe2O4 nanoparticles for the Photocatalytic oxidation of Rhodamine B: Influence of the alcoholic solutions

Elmer Gastello; David Estrada; Walter Estrada; Clemente Luyo; Juan Espinoza; Silvia Ponce; Juan Montes de Oca; Dwight Acosta; Juan M. Rodriguez

doi:10.1117/12.2534806

6 December 2019 TiO₂ films on CoFe₂O₄ nanoparticles for the photocatalytic oxidation of rhodamine B: influence of the alcoholic solutions

Elmer Gastello, David Estrada, Walter Estrada, Clemente Luyo, Juan Espinoza, Silvia Ponce, Juan Montes de Oca, Dwight Acosta , Juan M. Rodriguez

Author Affiliations +

Proceedings Volume 11371, International Workshop on Thin Films for Electronics, Electro-Optics, Energy, and Sensors 2019; 113710C (2019) https://doi.org/10.1117/12.2534806
Event: International Workshop on Thin Films for Electronics, Electro-Optics, Energy and Sensors, 2019, Reykjavik, Iceland

Abstract

In the present work, photocatalytic oxidation of Rhodamine B solutions were performed using a composite material prepared by titanium dioxide films deposited onto cobalt ferrite nanoparticles. Cobalt ferrite nanoparticles were prepared by coprecipitation of Co(II) and Fe(II) ions in basic medium, followed by a controlled oxidation process carried out by nitrate ions in basic medium in inert atmosphere at 95°C. The effect of 2 alcohols (ethanol and 2-propanol) as solvents in the deposition of TiO₂ films was studied as a function of CoFe₂O₄/TiO₂ mass ratios. Cobalt ferrite nanoparticles exhibited (36 ± 20) nm diameter with spheroidal shapes as confirmed by SEM studies. TiO₂ films deposited onto CoFe₂O₄ were thicker using ethanol as solvent according to SEM and TEM studies. Cobalt ferrite nanoparticles exhibit a weak oxidation behaviour since around 40% of Rhodamine is eliminated after 90 min of exposition. The 4 composite materials studied oxidize 100% of Rhodamine B after 60 min of reaction and kinetics results fitted a second order degradation reaction equation. As Rhodamine B solution pH was 5.83, faster reactions occur when composite materials develop low surface charge (PZC closer to 5.83) due to small surface charge repulsion. Materials prepared with CoFe₂O₄/TiO₂ ratios between 4 to 6 present higher kinetic constants which is confirmed by a faster Rhodamine B degradation

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Elmer Gastello, David Estrada, Walter Estrada, Clemente Luyo, Juan Espinoza, Silvia Ponce, Juan Montes de Oca, Dwight Acosta , and Juan M. Rodriguez "TiO₂ films on CoFe₂O₄ nanoparticles for the photocatalytic oxidation of rhodamine B: influence of the alcoholic solutions", Proc. SPIE 11371, International Workshop on Thin Films for Electronics, Electro-Optics, Energy, and Sensors 2019, 113710C (6 December 2019); https://doi.org/10.1117/12.2534806

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