Atomic composite-structure materials play an important role in energy generation and storage application fields for their advanced performance. Constructing heterostructured semiconductors is a promising strategy to devise photocatalytic systems with high activity. However, most studied hererostructures are those semiconductors with different materials formed by multi-steps, researches on in-situ formed hererostructure originated from the same precursor are few reported, and the effects of different structure ratios on photocatalytic performance are ambiguous. Here, according to in-situ temperature X-ray diffraction and transmission electron microscope techniques, a nano-sized in-situ formed heterostructure of TiO₂ semiconductors with anatase and TiO₂-B crystalline structures were designed, their structure ratios were adjusted, the heterostructure interface and photocatalytic reaction mechanism were also detected. Results show that high-quality heterojunction and optimum structure ratios have vital influence on photocatalytic performance, there is an obvious synergetic effect between anatase and TiO₂-B structure, degradation reactions on methyl orange (MO) under ultraviolet light irradiation prove that the highest activity toward MO removal can be obtained for material with 82.5% anatase structure.

原子复合结构材料以其先进的性能在能源生产和存储应用领域发挥着重要作用。构建异质结构半导体是设计具有高活性的光催化系统的有前途的策略。然而，研究最多的异位结构是通过多步骤形成的不同材料的半导体，原位形成的来自同一前驱体的异位结构研究报道较少，不同结构比例对光催化性能的影响不明确。在这里，根据原位温度X射线衍射和透射电子显微镜技术，原位形成纳米尺寸的TiO ₂半导体与锐钛矿和TiO _{2的异质结构}设计了-B晶体结构，调整了结构比，检测了异质结构界面和光催化反应机理。结果表明，高质量的异质结和最佳结构比对光催化性能有重要影响，锐钛矿和TiO ₂ -B结构之间存在明显的协同作用，紫外光照射下对甲基橙（MO）的降解反应证明活性最高对于具有 82.5% 锐钛矿结构的材料，可以获得 MO 去除。