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

Producción científica: Capítulo del libro/informe/acta de congresoArticulo (Contribución a conferencia)revisión exhaustiva

1 Cita (Scopus)

Resumen

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.

Idioma originalInglés
Título de la publicación alojadaInternational Workshop on Thin Films for Electronics, Electro-Optics, Energy, and Sensors 2019
EditoresPartha Banerjee, Karl Gudmundsson, Akhlesh Lakhtakia, Guru Subramanyam
EditorialSPIE
ISBN (versión digital)9781510635135
DOI
EstadoPublicada - 1 ene. 2019
EventoInternational Workshop on Thin Films for Electronics, Electro-Optics, Energy, and Sensors 2019, TFE3S 2019 - Reykjavik, Islandia
Duración: 24 jun. 201926 jun. 2019

Serie de la publicación

NombreProceedings of SPIE - The International Society for Optical Engineering
Volumen11371
ISSN (versión impresa)0277-786X
ISSN (versión digital)1996-756X

Conferencia

ConferenciaInternational Workshop on Thin Films for Electronics, Electro-Optics, Energy, and Sensors 2019, TFE3S 2019
País/TerritorioIslandia
CiudadReykjavik
Período24/06/1926/06/19

COAR

  • Artículo de conferencia

Categoría OCDE

  • Ingeniería química

Temas Repositorio Ulima

  • Colorantes
  • Dyes
  • Rhodamine B
  • Rodamina B
  • Violet (Color)
  • Violeta (Color)

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