水热法制备二氧化钛微球的形貌控制及机理研究

Morphology control and growth mechanism in hydrothermal preparation of TiO_2 microspheres

以钛粉、NaOH 和 H2 O2为原料,采用水热法成功制备出二氧化钛微球。利用 X-射线粉末衍射仪（ XRD）、扫描电子显微镜（ SEM）和场发射扫描电镜（ FESEM）对产物的结构、形貌和尺度进行了表征。结果表明,产物为金红石型TiO2,微球的直径约为1~2μm,微球由许多纳米管组成。根据实验结果,讨论了二氧化钛纳米管的生长机理,初步研究了双氧水用量,水热温度以及煅烧温度等对产物形貌形成的影响。

TiO2 microspheres were successfully synthesized through a hydrothermal method with titanium powder,NaOH and H2 O2 as reagents. The morphology and structure of as-prepared samples were investigated by X-ray Diffraction,Scanning Electron Micros-copy and Field Emission Scanning Electron Microscopy. The characterization results showed that the samples were rutile structure TiO2 ,the diameter of TiO2 microspheres was about 1~2 μm,and TiO2 microspheres were composed of nanocubes. The growth mech-anism of TiO2 nanotubes was proposed on the basis the results of experiment. The effects of dosage of H2 O2 ,hydrothermal reaction temperature and calcination temperature were also investigated.