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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ZnTiO_3。钛酸盐纳米管成分为H_2Ti_3O_7·3H_2O。XRD测试结果表明,ZnTiO_3具有立方相钙钛矿结构。SEM和TEM观察到ZnTiO_3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,ZnTiO_3在可见光区吸收率明显增强。当溶液中ZnTiO_3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ZnTiO_3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。
The perovskite type ZnTiO_3 was synthesized by the first step of hydrothermal titanate nanotubes followed by ion exchange. Titanate nanotube composition H_2Ti_3O_7 · 3H_2O. XRD results show that ZnTiO_3 has a cubic phase perovskite structure. SEM and TEM observations of ZnTiO_3 have unique beaded micro-topography. UV-visible diffuse reflectance spectra show that the absorption of ZnTiO 3 in the visible region is significantly enhanced. When the mass concentration of ZnTiO_3 in solution was 0.3g / L, the degradation rate of methyl orange solution with concentration of 15mg / L was 95.3% under irradiation of xenon lamp for 20min. The obtained ZnTiO_3 showed higher than that of standard catalyst P25 under the same reaction conditions Catalytic activity. The degradation kinetics of methyl orange conformed to the first-order kinetic equation, and the rate constant of degradation reaction was 0.1020.