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

Research output: Chapter in Book/Report/Conference proceedingPaper (Conference contribution)

1 Scopus citations

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.

Original languageEnglish
Title of host publicationInternational Workshop on Thin Films for Electronics, Electro-Optics, Energy, and Sensors 2019
EditorsPartha Banerjee, Karl Gudmundsson, Akhlesh Lakhtakia, Guru Subramanyam
PublisherSPIE
ISBN (Electronic)9781510635135
DOIs
StatePublished - 1 Jan 2019
EventInternational Workshop on Thin Films for Electronics, Electro-Optics, Energy, and Sensors 2019, TFE3S 2019 - Reykjavik, Iceland
Duration: 24 Jun 201926 Jun 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11371
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceInternational Workshop on Thin Films for Electronics, Electro-Optics, Energy, and Sensors 2019, TFE3S 2019
CountryIceland
CityReykjavik
Period24/06/1926/06/19

Keywords

  • Cobalt ferrite
  • Nanoparticles
  • Titanium oxide

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    Gastello, E., Estrada, D., Estrada, W., Luyo, C., Espinoza, J., Ponce, S., Montes De Oca, J., Acosta, D., & Rodriguez, J. M. (2019). TiO2 films on CoFe2O4 nanoparticles for the photocatalytic oxidation of rhodamine B: Influence of the alcoholic solutions. In P. Banerjee, K. Gudmundsson, A. Lakhtakia, & G. Subramanyam (Eds.), International Workshop on Thin Films for Electronics, Electro-Optics, Energy, and Sensors 2019 [113710C] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11371). SPIE. https://doi.org/10.1117/12.2534806