Document Type: Original Research Paper
School of Physics, Damghan University (DU), Damghan, Islamic Republic of Iran
School of Chemistry, Damghan University (DU), Damghan. Iran
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.