| 纳米钙钛矿LaxSr1-xFe1-yCoyO3复合氧化物的制备和表征 | |
| Synthesis and Characterization of Nanostructure Perovskite Type LaxSr1-xFe1-yCoyO3 | |
| 摘要: 用甘氨酸-硝酸盐燃烧合成法，制备LaxSr1-xFe1-yCoyO3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LaxSr1-xFe1-yCoyO3的催化性能。结果表明：CO2+的加入可使LaxSr1-xFeO3的光催化活性有所提高，B位离子(Fe3+，CO2+)改变与加入，使LaxSr1-xFe1-yCoyO3(x=0.7，0.3；y=0.3，0.9，1)光催化活性高于LaxSr1-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。 | |
| 关键词: LaxSr1-xFe1-yCoyO3 光电催化活性 人工神经网络 | |
| 基金项目: | |
| Abstract: 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 15.3～29.8 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 decolor-ation rate is over 91% about 0.75 hour and LaxSr1-xFe1-yCoyO3 system kinetic reaction is pseudo-first order. | |
| Keywords: LaxSr1-xFe1-yCoyO3 photoelectrocatalytic activity artificial neural network | |
| 投稿时间：2005-04-05 修订日期：2005-06-05 | |
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| 林生岭,徐绍芬,成烨,周虎,谢春生,严豸明.纳米钙钛矿LaxSr1-xFe1-yCoyO3复合氧化物的制备和表征[J].无机化学学报,2005,21(11):1637-1642. | |
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