纳米钙钛矿LaxSr1-xFe1-yCoyO3复合氧化物的制备和表征

用甘氨酸-硝酸盐燃烧合成法，制备La_xSr_1-xFe_1-yCo_yO₃复合氧化物的陶瓷粉末，对该钙钛矿型氧化物进行了XRD、IR、紫外漫反射光谱及循环伏安曲线分析。结果表明：该复合氧化物粉体平均晶粒为15.3～29.8 nm,为立方和正交晶系。该氧电极具有双功能催化特性，但不完全可逆。对水溶液染料进行光解实验，利用紫外-可见、人工神经网络光度法研究La_xSr_1-xFe_1-yCo_yO₃的催化性能。结果表明：CO²⁺的加入可使La_xSr_1-xFeO₃的光催化活性有所提高，B位离子(Fe³⁺，CO²⁺)改变与加入，使La_xSr_1-xFe_1-yCo_yO₃(x=0.7，0.3；y=0.3，0.9，1)光催化活性高于La_xSr_1-xFeO₃。同时，对5种染料进行紫外光解，在0.75 h，脱色率大于91%，并为动力学一级反应。

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 Lax Sr1-x Fe1-y Coy O3 . 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 Lax Sr1-x Fe1-y Coy O3 was in the range of 15.3~29.8 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 Lax Sr1-x Fe1-y Coy O3 was studied with UV-Vis, IR and artificial nerve network and spectrophotometer. The results showed that the complex oxides of Lax Sr1-x Fe1-y Coy O3 (x=0.7, 0.3; y=0.3, 0.9, 1) presented evident photo-catalytic activity. The Lax Sr1-x Fe1-y Coy O3 showed stronger activities than Lax Sr1-x FeO3 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 Lax Sr1-x FeO3. At the same time, the decoloration and degradation of five dyestuffs were studied by the catalytic of Lax Sr1-x Fe1-y Coy O3 with ultraviolet light. The decolor-ation rate is over 91% about 0.75 hour and Lax Sr1-x Fe1-y Coy O3 system kinetic reaction is pseudo-first order.