【摘要】 采用先水热处理法制得钛酸盐纳米管再进行离子交换的两步工艺合成钙钛矿型ZnTiO₃。钛酸盐纳米管成分为H₂Ti₃O₇·3H₂O。XRD测试结果表明,ZnTiO₃具有立方相钙钛矿结构。SEM和TEM观察到ZnTiO₃具有独特的串珠状微观形貌结构。紫外-可见漫反射光谱表明,ZnTiO₃在可见光区吸收率明显增强。当溶液中ZnTiO₃质量浓度为0.3g/L时,在氙灯下照射20min,浓度为15mg/L的甲基橙溶液降解率达95.3%,所得ZnTiO₃显示出比相同反应条件下标准催化剂P25更高的催化活性。甲基橙的降解动力学符合一级动力学方程,降解反应的速率常数为0.1020。更多还原

【Abstract】 Perovskite ZnTiO₃ was prepared through a new method which contained a hydrothermal process for the preparation of titanate nanotubes and an ion-exchange process.The titanate nanotubes were inferred to be H2_Ti₃O₇·3H₂O.X-ray diffraction（XRD）result revealed the presence of cubic perovskite phase of ZnTiO₃.The unique chain-like morphology of ZnTiO₃ was observed by scanning electron microscopy（SEM） and transmission electron microscopy（TEM）.UV-Vis diffusive reflection spectra of ZnTiO₃indicated that the absorbance obviously increased in the visible light region.The degradation rate of methyl orange solution（15 mg/L）reached 95.3%over ZnTiO₃（0.3 g/L） after 20 min xenon light irradiation,which was higher than that using the commercial catalyst P25 under the same reaction condition.The degradation kinetic results follow the first-order equation and the rate constant is 0.1020.更多还原