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

Abstract

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