Photocatalytic Degradation of Water-Soluble Azo Dyes by LaFeO₃ and YFeO₃

Abstract

Perovskite-type oxides LaFeO3 and YFeO3 were prepared by the citrate method. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), infrared spectrometer (IR), ultraviolet visible spectrometer (UV). The results show that complex oxides LaFeO3 and YFeO3 have stable perovskite structure. The mean particle diameter of YFeO3 is about 30~40 nm, while LaFeO3 is about 50~60 nm. Photocatalytic degradation experiments of azo dye acid red 3B were done using perovskite-type oxides LaFeO3 and YFeO3 as photocatalysts. Dye Acid Red 3B solution with the LaFeO3 and YFeO3 undergone several degradation stages and the photodegradation rates were respectively 68.2% and 90.0% after irradiating 2 hours. The results show that the perovskite-type oxide YFeO3 has better photocatalytic activity, which mainly relates with the factors of position A such as the negative, the electronic structure, ion radius and so on.

Peculiarities of LaFeO3 nanocrystals formation via glycine-nitrate combustion

“…It is worth noting that at G/N = 0.2, in addition to the amorphous phase, a trace amount of La(OH) 2 NO 3 crystalline phase is present. In the similar system based on YFeO 3 , the impurities of nitrate derivatives of REE were also found in the powders obtained by glycine-nitrate synthesis at non-stoichiometric G/N ratios, but their crystallization did not occur during combustion [29]. In the case of LaFeO 3 system, the formation of La(OH) 2 NO 3 is probably explained by a higher temperature in the reaction zone in comparison to that which can be implemented during synthesis in the YFeO 3 system.…”

La0.8Bi0.2FeO3 Perovskite-Type: High-Performance of Photocatalytic Degradation of Ortho-Toluidine Blue Under Visible Light Irradiation

“…Their unique structural characteristics and synthesis processes significantly influence their photocatalytic efficiency, making them versatile for diverse applications, including gas sensing [21], water splitting [22], and the photocatalytic degradation of organic pollutants [23,24]. Among the narrow band gap semiconductors, LaFeO3 stands out as a promising photocatalyst, with several studies emphasizing its synthesis and efficacy in the photodegradation of organic dyes under visible light irradiation [25][26][27][28]. LaFeO 3 , with a narrow band gap of only 2.0 eV, exhibits exceptional potential for utilizing visible light from the solar spectrum, rendering it highly suitable for 279 La 0.8 Bi 0.2 FeO 3 Perovskite-Type: High-Performance of Photocatalytic Degradation...…”

Synthesis of YFeO_3-δ and LaFeO_3-δ Perovskites with High Catalytic Activity in Carbon Oxidation Reactions

“…Oxides with ABO3 perovskite structure have a number of valuable physical and chemical properties making them objects of intensive experimental and theoretical studies. A significant part of them is aimed to the development of magnetic materials [1,2], photocatalysts [3,4,5] and redox catalysts wide type, such as selective oxidation of hydrocarbons to synthesis gas [6,7], deep oxidation of hydrocarbons [8][9][10][11], of soot [12][13][14] and of CO [15][16][17]. They are an alternative to the traditionally used three-way catalysts for cleaning exhaust of gasoline engines.…”