Structural Features of La0.55Ca0.45A0.50Co0.50O3 (A=Mg, Mn) Nanoparticles Over Photo-Degradation of Methyl Blue

In this paper, La0.55Ca0.45A0.5Co0.5O3(A=Mg, Mn) nanoparticles were synthesized by citrate method. The samples were characterized using the techniques of using X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) and UVVis spectroscopy. The structure was analyzed by Rietveld fitting of the XRD pattern by using X’Pert package and Fullprof program, these shows that the samples have perovskite structure. The calculated values of crystallite size, particle size and band gap energy of La0.55Ca0.45Mg0. 5Co0.5O3 are much less than La0.55Ca0.45Mg0.5Co0.5O3. The effects of three operational parameters including irradiation time, pH, and the catalyst amount on the photocatalytic activity of the product on the degradation of methyl blue (MB) under solar condition were studied. The photocatalytic degradation efficiency of MB solution over La0.55Ca0.45Mn0.5Co0.5O3 nanoparticles is higher than that over La0.55Ca0.45Mg0.5Co0.5O3 nanoparticles. 96 % degradation is obtained in an aqueous solution at pH=2.33 and containing 30 mg La0.55Ca0.45Mg0.5Co0.5O3 catalyst after 30 minutes.