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在NaOH溶液中采用水热法处理钛粉制备TiO2纳米针/带微球。利用场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)、选区衍射(SAED)、紫外-可见吸收光谱(UV-vis)和X射线衍射仪(XRD)对样品结构进行表征。结果显示,水热温度和溶液浓度共同决定晶体的生长方向,纳米针/带微球的直径(40~50μm)与钛粉直径相当。纳米针/带微球经450°C热处理1h后转变锐钛矿。以甲基橙为目标考察样品的光催化活性。在相同条件下,样品的光催化活性为:TiO2纳米针微球>TiO2纳米带微球>P25。
Preparation of TiO2 Nanostructures / Microspheres by Hydrothermal Method in NaOH Solution. The structure of the samples was characterized by FESEM, TEM, SAED, UV-vis and XRD. The results show that the hydrothermal temperature and solution concentration determine the crystal growth direction. The diameter of the nanoneedle / tape microspheres (40-50 μm) is similar to that of titanium powder. Nanotubes / microspheres transform anatase after heat treatment at 450 ° C for 1 h. The photocatalytic activity of the sample was examined with methyl orange. Under the same conditions, the photocatalytic activity of the samples was: TiO2 nanosphere microspheres> TiO2 nanobelts microspheres> P25.