Synthesis and identification of nano-perovskite LaCoO3 using in removal of Bordeaux fix fungicide from aqueous solution
Subject Areas : journal of New Materialsایمان خسروی 1 , melika eftekhar 2 , نسیم قادریان 3
1 -
2 - Departman of chemistry, islamic azad university, qeshm branch
3 -
Keywords: Nano-perovskite, Sol-gel method, Bordeaux fix fungicide, X-ray diffraction.,
Abstract :
In this study, perovskite nanoparticles (LaCoO3) were synthesized using a sol-gel method. Thermogravimetric analysis (TGA) indicated that the calcination temperature was around 800°C. Fourier transform infrared (FTIR) and X-ray diffraction (XRD) results confirmed the formation of a single perovskite phase. Also, the surface morphology of nano-perovskite was examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and the particle size obtained by this method was consistent with the X-ray diffraction results. Then, the ability of nano-perovskite LaCoO3 to remove the Bordeaux fix fungicide was investigated. The effect of various parameters such as initial contaminant concentration, amount of nano perovskite, temperature and pH on the removal of the desired contaminant was investigated and it was found that the highest pesticide adsorption was at pH=11 and temperature of 45°C. The investigation of factors affecting the reaction rate showed that the adsorption process followed second-order kinetics. Two models of adsorption isotherms, Langmuir and Freundlich, were investigated and the results showed that the adsorption isotherm followed the Freundlich model. Also, the photocatalytic removal of the Bordeaux fix fungicide was tested at pH=7 and UV irradiation and it were found that the synthesized nano perovskite does not have photocatalytic properties.
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