Rod‐like, rhombic, octahedral bipyramid‐shaped, cuboid, and spindle‐like anatase TiO₂ nanocrystals samples with part of {101}, {001} and {010} facets exposure were synthesized through a straightforward solvothermal treatment of layered tetratitanate nanobelt colloidal solution precursor. The shape and structural evolutionmechanism of the as‐synthesized anatase TiO₂ nanocrystals from the layered tetratitanate nanobelts were investigated by using X‐ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and transmission electron microscope (TEM) and high‐resolution transmission electron microscope (HRTEM). The transformation from the layered tetratitanate nanobelts into the various morphologies anatase TiO₂ nanocrystals may experience two stages during the solvothermal process including an in situ topotactic dehydration reaction of the layered tetratitanate nanobelts, and a dissolution‐recrystallization reaction of the nanobelts anatase TiO₂ crystals along the different planes. Furthermore, the photocatalytic activity of the various morphologies anatase TiO₂ nanocrystals was also investigated and discussed, and compared to the benchmark P25 TiO₂ nanocrystals. The results revealed that the {010}‐faceted spindle‐like anatase TiO₂ nanocrystals exhibited the most superior photocatalytic activity for the degradation of methylene blue.

中文翻译：

---

四钛酸盐纳米带衍生的各种形貌锐钛矿型TiO2纳米晶的合成，转化机理及光催化性能

棒状，菱形，八面体双金字塔形，长方体和纺锤形锐钛矿型TiO ₂纳米晶样品，其部分{101}，{001}和{010}面暴露是通过层状四钛酸盐纳米带胶体的直接溶剂热处理而合成的。溶液前体。使用X射线衍射（XRD），场发射扫描电子显微镜（FESEM），透射电子显微镜（TEM）和高分辨电子显微镜研究了层状四钛酸盐纳米带合成的锐钛矿型TiO ₂纳米晶体的形状和结构演化机理。分辨率透射电子显微镜（HRTEM）。从层状四钛酸酯纳米带向各种形态的锐钛矿型TiO _2的转变纳米晶体在溶剂热过程中可能经历两个阶段，包括层状四钛酸酯纳米带的原位全位脱水反应以及纳米带锐钛矿型TiO ₂晶体沿不同平面的溶解-再结晶反应。此外，还研究和讨论了各种形态的锐钛矿型TiO ₂纳米晶体的光催化活性，并将其与基准P25 TiO ₂纳米晶体进行了比较。结果表明，{010}切面的纺锤状锐钛矿型TiO ₂纳米晶体对亚甲基蓝的降解表现出最优异的光催化活性。