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

Paper Details

Date Published: 6 December 2019
PDF: 8 pages
Proc. SPIE 11371, International Workshop on Thin Films for Electronics, Electro-Optics, Energy, and Sensors 2019, 113710C (6 December 2019); doi: 10.1117/12.2534806
Show Author Affiliations
Elmer Gastello, Univ. Nacional de Ingeniería (Peru)
David Estrada, Univ. Nacional de Ingeniería (Peru)
Walter Estrada, Univ. Nacional de Ingeniería (Peru)
Clemente Luyo, Univ. Nacional de Ingeniería (Peru)
Juan Espinoza, Univ. Nacional de Ingeniería (Peru)
Silvia Ponce, Univ. de Lima (Peru)
Juan Montes de Oca, Univ. Nacional de Ingeniería (Peru)
Dwight Acosta , Univ. Nacional Autónoma de México (Mexico)
Juan M. Rodriguez, Univ. Nacional de Ingeniería (Peru)

Published in SPIE Proceedings Vol. 11371:
International Workshop on Thin Films for Electronics, Electro-Optics, Energy, and Sensors 2019
Partha Banerjee; Karl Gudmundsson; Akhlesh Lakhtakia; Guru Subramanyam, Editor(s)

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