Zn-TiO2纳米管的光催化活性

采用水热合成-浸渍法制备锌掺杂TiO2纳米管(Zn-TiO2纳米管),透射电镜照片显示Zn-TiO2纳米管为两端开口形貌均一的中空管状结构,管径约6～8 nm,壁厚约1 nm,长度约50～200 nm。研究了Zn-TiO2纳米管对甲基橙的光催化性能,结果表明:掺杂适量锌提高了TiO2纳米管对甲基橙的光催化降解性能,0.4%Zn-TiO2纳米管的光催化性能最佳。同时还探讨了Zn-TiO2纳米管用量和初始pH值等因素对光催化降解甲基橙的影响,结果显示Zn-TiO2纳米管能有效地降解甲基橙。随着光催化反应进行,CODCr去除率和脱色率变化规律不完全相同,可能是由于芳基和烷基降解速率不同所致。

Study on photocatalytic activity of Zn-TiO2 nanotubes

Zinc-doped titania nanotubes(Zn-TiO2 nanotubes) were synthesized using hydrothermal treatment-impregnation method,and photos of transmission electron microscopy(TEM) show that Zn-TiO2 nanotubes were hollow and open-ended,and they were measured to be about 6 to 8 nm in diameter,with about 1 nm wall thickness,and the lengths in the range of 50 to 200 nm.The photocatalytic activities of Zn-TiO2 nanotubes for the degradation of methyl orange were investigated.The results showed that the photocatalytic activities of TiO2 nanotubes enhanced after Zinc-doping,and 0.4% Zn-TiO2 nanotubes exhibited the best photocatalytic activity.The effects of various parameters such as pH and amount of Zn-TiO2 nanotubes on the photocatalytic degradation of methyl orange have been studied,and the results showed that methyl orange was proved to be degraded effectively using Zn-TiO2 nanotubes.The CODCr removal efficiencies and color removal efficiencies changed differently during the photocatalytic degradation of methyl orange,probably due to the different degradation efficiencies of aryl group and alkyl group.