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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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Date
2019
Author(s)
Gastello, Elmer
Estrada, David
Estrada, Walter
Luyo, Clemente
Espinoza, Juan
Ponce Álvarez, Silvia
Montes de Oca, Juan
Acosta, Dwight Roberto
Rodríguez, Juan M.
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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
URI
https://hdl.handle.net/20.500.12724/10118
DOI
https://doi.org/10.1117/12.2534806
How to cite
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
Publisher
SPIE
Area / Line of research
Recursos naturales y medio ambiente / Materiales avanzados
Category / Subcategory
Pendiente / Pendiente
Subject
Rodamina B
Violeta (Color)
Colorantes
Rhodamine B
Violet (Color)
Dyes
Related Resource(s)
https://doi.org/10.1117/12.2534806
Journal
Proceedings of SPIE - The International Society for Optical Engineering
Collections
  • Ingeniería Industrial [142]


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