Title
TiO<inf>2</inf> films on CoFe<inf>2</inf>O<inf>4</inf> nanoparticles for the photocatalytic oxidation of rhodamine B: Influence of the alcoholic solutions
Date Issued
2019
Access level
metadata only access
Resource Type
conference paper
Author(s)
Universidad Nacional de Ingeniería
Universidad Nacional de Ingeniería
Universidad Nacional de Ingeniería
Publisher(s)
SPIE
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.
Volume
11371
Language
English
OCDE Knowledge area
Recubrimiento, Películas
Scopus EID
2-s2.0-85077815796
ISBN
9781510635135
Source
Proceedings of SPIE - The International Society for Optical Engineering
Resource of which it is part
Proceedings of SPIE - The International Society for Optical Engineering
ISSN of the container
0277786X
ISBN of the container
978-151063513-5
Sponsor(s)
would like to thank the Peruvian Council for Science and Technology (CONCYTEC) for the Scholarship.
Sources of information: Directorio de Producción Científica Scopus