Abstracts Book - IMRC 2018

• SF5-O046
STRUCTURAL CHARACTERIZATION OF BiFeO3, Bi1-xBaxFeO3 and
TiO2/BiFeO3 COMPOUNDS AND THEIR PHOTOCATALYTIC
EVALUATION IN THE DEGRADATION OF 4-CHLOROPHENOL
UNDER VISIBLE LIGHT
Evaristo Salaya Geronimo 1 , Angel Madrigal Magaña 2 , David Salvador Garcia Zaleta 3 , Jose
Manuel Vazquez Rodriguez 3 , Maria Guadalupe Hernandez Cruz 3 , Gabriela Jácome Acatitla 3 ,
Rosendo López González 4
1 Universidad Juárez Autónoma de Tabasco, Posgrado de Ciencias en Química Aplicada, Mexico.
2 Universidad Juárez Autónoma de Tabasco, Posgrado de Ciencias en Ingeniería, Mexico.
3 Universidad Juárez Autónoma de Tabasco, División Académica Multidisciplinaria de Jalpa de
Méndez, Mexico. 4 Universidad Juárez Autónoma de Tabasco, DIvisión Academica de Ingenieria
y Arquitectura, Mexico.
Bismuth ferrite (BiFeO 3 ) is proposed as an important new visible-light
photocatalyst due to its narrow band-gap energy (2.2 eV) and excellent chemical
stability. The main problem of this compound is to control the formation of
secondary phases that could affect the BiFeO 3 properties. In this work, BiFeO 3
and Bi 1-x Ba x FeO 3 (x=0-0.15) nanopowders were synthesized by Pechini method
and TiO 2 /BiFeO 3 compounds were obtained with a combination of Sol-gel and
Pechini methods. The diverse specimens were characterized by XRD to obtain
composition of phases and Rietveld refinement was helpful to quantify the
phases in the photocatalysts. These results indicated the formation of single
phase compounds in the majority of the series and estimated the percentages
of phases in the rest of the specimens. Crystal sizes, as well as the rhombohedral
structure of the BiFeO 3 was observed by TEM technique. SEM results showed
the morphology of the diverse nanopowders and revealed in the TiO 2 /BiFeO 3
compounds, some agglomerations higher than 500 nm. UV-vis spectroscopy
contributed to calculate the band gap values between 2.0-2.5 eV. Finally, the
photocatalytic performance of the compounds were evaluated in the
degradation of 4-chlorophenol under visible light at room temperature. All the
specimens showed good response in degradation of this pollutant at 120 min.
Acknowledgment: Authors wish to thank the PRODEP program for the support
of this presentation (UJAT-PTC-260)
Keywords: BiFeO3, Perovskite, TiO2/BiFeO3
Presenting authors email: david.garcia@ujat.mx