Synthesis and characterization of nanostructure perovskite type LaxSr1-xFe1-yCoyO3

A new combustion synthesis method, the glycine-nitrate process, has been used to prepare complex oxide ceramic powders of LaxSr1-xFe1-yCoyO3. The structure and catalytic properties of the perovskite oxides were characterized by XRD, IR, UV-DRS and cyclic voltammeter curves technologies. The results indicated that the average particle size of the powder of both the cubic and orthorhombic LaxSr1-xFe1-yCoyO3 was in the range of 15.3 similar to 29.8 nm and that oxygen electrodes being not completely reversible have bifunctional catalyst activity. The degradation experiment of various water-soluble dyestuff was performed by photo-catalytic methods. The catalytic activity of LaxSr1-xFe1-yCoyO3 was studied with UV-Vis, IR and artificial nerve network and spectrophotometer. The results showed that the complex oxides of LaxSr1-xFe1-yCoyO3 (x=0.7, 0.3; y=0.3, 0.9, 1) presented evident photo-catalytic activity. The LaxSr1-xFe1-yCoyO3 showed stronger activities than LaxSr1-xFeO3 due to Co2+ addition and the unique electronic structure of the ion B(Fe3+, Co3+). The results also showed that the addition of Co2+ can remarkably improve the photoelectrocatalytic activity of LaxSr1-xFeO3. At the same time, the decoloration and degradation of five dyestuffs were studied by the catalytic of LaxSr1-xFe1-yCoyO3 with ultraviolet light. The decoloration rate is over 91% about 0.75 hour and LaxSr1-xFe1-yCoyO3 system kinetic reaction is pseudo-first order.