Abstract:

Iron-doped titanium dioxide hollow microspheres were prepared hydrothermally using titanium tetrafluoride and ferric nitrate nonahydrate in aqueous solution as starting materials, and were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), surface area (BET) and X-ray photoelectron spectroscopy (XPS). Photocatalytic activity of the microspheres was evaluated on photocatalytic degradation of aqueous methylene blue (MB). TiO₂ in hollow microspheres created at 160℃ were anatase crystal and doping a relatively small amount of iron did not alter morphology and crystal structure of TiO₂. Iron doping could significantly improve the photocatalytic activity of TiO₂ hollow microspheres. The TiO₂ hollow microspheres obtained at a condition of 160℃ for 12 h had optimal dimensional uniformity and photocatalytic activity, which the best photocatalytic effect were observed on hollow microspheres with a 1.5% ratio of iron over titanium because of the smallest size and the highest surface area.

Key words: TiF₄, TiO₂, hydrothermal method, iron doping, photocatalytic, hollow microspheres

摘要：

以TiF₄为钛源、九水合硝酸铁为掺杂前体，采用水热法制备铁掺杂的TiO₂空心微球。采用SEM、TEM、XRD、BET、XPS等技术对样品的形貌、结构、晶型、比表面积、元素组成等进行表征，以亚甲基蓝（MB）的光催化降解为目标反应，评价其光催化活性。结果表明，160℃下水热反应生成的纳米TiO₂空心微球晶型为锐钛矿，少量掺铁并不影响微球的形貌及晶体结构。光催化实验表明，160℃下水热反应12 h生成的TiO₂空心微球样品均匀性好、光催化活性最佳；铁掺杂能显著提高TiO₂空心微球的催化活性，当铁钛比为1.5:100时，所得样品粒径最小，比表面积最大，光催化活性最高。

关键词: 氟化钛, 二氧化钛, 水热法, 铁掺杂, 光催化, 空心微球