Effect of Fe3+ Doping in the Photocatalytic Properties of BaSnO3 Perovskite

Abstract

In the last ten years, stannates with perovskite structure have been tested as photocatalysts. In spite of the ability of perovskite materials to accommodate different cations in its structure, evaluation of doped stannates is not a common task in the photocatalysis area. In this work, Fe 3+ doped BaSnO 3 was synthesized by the modified Pechini method, with calcination between 300 and 800°C/4 h. The powder precursor was characterized by thermogravimetry after partial elimination of carbon. Characterization after the second calcination step was done by X-ray diffraction, Raman spectroscopy and UV-visible spectroscopy. Materials were tested in the photocatalytic discoloration of the Remazol Golden Yellow azo dye under UVC irradiation. Higher photocatalytic efficiency was observed under acid media. As no meaningful adsorption was observed at this condition we believe that an indirect mechanism prevails. Fe 3+ doping decreased the band gap and favored the photocatalytic reaction, which may be assigned to the formation of intermediate levels inside the band gap.

Supporting the photocatalysts on ZrO2: An effective way to enhance the photocatalytic activity of SrSnO3

“…The solutions were analyzed by UV-Vis spectroscopy using a SHIMADZU UV-2550 spectrometer, in the range of 300 to 700 nm. The photodegradation reaction of the dye was monitored by measuring the absorbance at = 411 nm (Remazol maximum absorption wavelength ), to calculate the percentages of discoloration [33]. Adsorption and photocatalytic tests with scavengers were performed using the same conditions described above.…”

Alkaline earth stannates applied in photocatalysis: prospection and review of literature

“…An increase in degradation from 85% to 99.5% after 320 min was reported. Barium stannate was tested as a photocatalyst for dye degradation in pure [54,58] and in the doped form [41,42]. Moshtagi et al [42] obtained nanostructured BaSnO 3 by co-precipitation and evaluated the influence of the synthesis parameters in the morphology of the particles in order to obtain nanostructures.…”

“…Doped BaSnO 3 was tested in the photodegradation of the RNL azo-dye in two different papers from the same research group. Moura et al [58] synthesized the BaSn 1-x Fe x O 3 (x= 0.05 and 0.10) by the modified Pechini method and performed the photocatalytic tests under UVC irradiation. The photocatalytic efficiency at pH 3 (93%) was higher than degradation at pH 6 for the sample BaSn 0.9 Fe 0.1 O 3 .…”

Effect of Fe doping on the structural, morphological, optical, magnetic and dielectric properties of BaSnO3

“…Due to the capability of doping in A and B sites, high electron mobility and oxygen stability, BaSnO3 has large potential applications as a system to combine the versatile perovskite structure and the semiconductor technologies [17]. Moura et al, reported that Fe doping decreased the bandgap energy of BaSnO3 and favored the photocatalytic reaction due to the formation of intermediate levels inside the bandgap [18].The observation of ferromagnetism in Mn and Fe-doped BaSnO3 is an important leap in the literature that opened up the path for BaSnO3 dilute magnetic semiconductor (DMS) applications [11,22]. DMS are formed when a small quantity of magnetic ions are doped with semiconductors.…”