TY - JOUR
T1 - Bulk and surface analysis of Ti 1-xFe xO 2/Fe 2O 3 composites prepared by solid state reaction for photocatalytic applications
AU - Robles-Águila, M. J.
AU - Elizalde-González, M. P.
AU - Mendoza, M. E.
AU - Silva-González, R.
AU - Yee-Madeira, H.
PY - 2012/4
Y1 - 2012/4
N2 - Ti 1-xFe xO 2 / Fe 2O 3 (x = 0.3, 0.6, and 0.7 wt%) composites were prepared by solid state reaction of the oxides TiO 2 (rutile phase) and Fe 2O 3 at 550 °C. The following techniques were applied for the characterization of the composites: X-ray powder diffraction, Mössbauer spectroscopy, SEM, energy dispersive X-ray spectroscopy and adsorption of nitrogen. The anatase/rutile/hematite ratio and the abundance of Fe 3+ were quantified. The results indicate that Fe 3+ substituted Ti 4+ in the rutile structure and that the α-Fe 2O 3 phase was predominantly on the surface of the crystalline Ti 1-xFe xO 2 powders. A substantial increase of the materials density, with respect to rutile, favoured the application of the composites in photocatalytic experiments. The performance of the solids upon the photodegradation of aqueous solutions of carbofuran was evaluated. The Lewis sites created in the composites correlated directly with the photodegradation rate constant of carbofuran and the decrease of the total organic carbon content in the treated solutions.
AB - Ti 1-xFe xO 2 / Fe 2O 3 (x = 0.3, 0.6, and 0.7 wt%) composites were prepared by solid state reaction of the oxides TiO 2 (rutile phase) and Fe 2O 3 at 550 °C. The following techniques were applied for the characterization of the composites: X-ray powder diffraction, Mössbauer spectroscopy, SEM, energy dispersive X-ray spectroscopy and adsorption of nitrogen. The anatase/rutile/hematite ratio and the abundance of Fe 3+ were quantified. The results indicate that Fe 3+ substituted Ti 4+ in the rutile structure and that the α-Fe 2O 3 phase was predominantly on the surface of the crystalline Ti 1-xFe xO 2 powders. A substantial increase of the materials density, with respect to rutile, favoured the application of the composites in photocatalytic experiments. The performance of the solids upon the photodegradation of aqueous solutions of carbofuran was evaluated. The Lewis sites created in the composites correlated directly with the photodegradation rate constant of carbofuran and the decrease of the total organic carbon content in the treated solutions.
KW - carbofuran
KW - doping
KW - iron-titania composites
KW - photocatalysis
KW - surface characterization
UR - http://www.scopus.com/inward/record.url?scp=84858332170&partnerID=8YFLogxK
U2 - 10.1002/sia.3879
DO - 10.1002/sia.3879
M3 - Artículo
SN - 0142-2421
VL - 44
SP - 484
EP - 490
JO - Surface and Interface Analysis
JF - Surface and Interface Analysis
IS - 4
ER -