Preparation, Characterization and Optical Property of LaFeO3 Nanoparticles via Sol-Gel Combustion Method

Abstract

Perovskite LaFeO3 is one of the most useful materials for the application in a catalyst, gas sensors, and fuel cells, etc. LaFeO3 nanoparticles were synthesized by the citrate sol-gel method. According to the TG-DTA analysis on LaFeO3 xerogel powder, the proper crystallization temperature was found to be at 450 °C. The TEM images also show clear crystal formation was started at 450 °C. The LaFeO3 nanocrystalline particles were obtained by sintering the calcined powders at different temperatures (800 °C, 900 °C, and 1000 °C) for 4 hours. The resulting particles were characterized by XRD, EDXRF, FT IR, and SEM analysis. At 900 °C, the XRD pattern of LaFeO3 shows an orthorhombic crystal structure. The average crystallite sizes vary between 30-60 nm and the increase in crystallite size with increasing sintering temperatures and it may be due to the increase in grain growth. FT IR analysis shows strong La-O and Fe-O vibrations. Based on the XRD and FT IR data, the optimum sintering temperature was chosen at 900 °C. The SEM micrographs show that the morphology of LaFeO3 has small-sized grains with round shape. The optical properties were determined by UV-visible spectroscopy in the wavelength range of 300 nm-700 nm. The optical band gap energy values of LaFeO3 using Tauc’s plot were found to be about 2.45 eV. These results indicate that the LaFeO3 prepared by the sol-gel method has a relatively lower band gap value and so it can have the potential for photocatalytic applications.

Copula Based Spatial Analysis of Drought Return Period in Southwest of Iran

“…Standardized precipitation index (SPI) is the most usable index in drought monitoring for its simplicity [21], and its accuracy compared to other indicators [31,32]. To follow the process, cumulative distribution function was first computed by gamma distribution function, fitted into time series.…”

Pharmaceuticals and personal care products in water and wastewater: a review of treatment processes and use of photocatalyst immobilized on functionalized carbon in AOP degradation

“…This process is used in wastewater treatment as a result of their broad and high photocatalytic activities on the decomposition of various organic pollutants [137]. Nano-photocatalysts consist of nano-size order metal oxides, with semiconducting properties and strong ability to degrade large varieties of persistent organic pollutants such as dyes, detergents, pesticides, and volatile organic compound that WWTPs cannot remove [138,139]. Quite several semiconductors such as ZnO, SrTiO 3 , Fe 2 O 3, SnO 2 , CuO 2 , WO 3, and Fe 3 O 4 have been used for the decomposition of organic pollutants from different environmental matrices [139][140][141].…”

“…Nano-photocatalysts consist of nano-size order metal oxides, with semiconducting properties and strong ability to degrade large varieties of persistent organic pollutants such as dyes, detergents, pesticides, and volatile organic compound that WWTPs cannot remove [138,139]. Quite several semiconductors such as ZnO, SrTiO 3 , Fe 2 O 3, SnO 2 , CuO 2 , WO 3, and Fe 3 O 4 have been used for the decomposition of organic pollutants from different environmental matrices [139][140][141]. They can also be used for degrading halogenated and non-halogenated organic compounds, PPCPs, and heavy metals in some specific situations [7].…”

Experimental Modeling and Evaluation Sediment Scouring in Riverbeds around Downstream in Flip Buckets

“…This refers to the Froude, Reynolds and Weber laws fulfillment at the same time. Theingi et al [35] concluded that employing very small scale models might influence the scour dimensions despite the limited advice given to modellers. The scour profile data must be normalized to provide for a comparison between varied experimental scales, and after a dimensional analysis of the governing quantities, it has been customary to non-dimensionalize the scour depth and the scour length by respectively employing the maximum scour depth, d sm , and the maximum scour length, L sm [36].…”