In this work, we used two simple and inexpensive hydrothermal steps to synthesize Bi₂S₃ nanoflowers branched on TiO₂ nanorod heterostructure. The nanoscale morphology of Bi₂S₃ deposited on TiO₂ nanorods was optimized by controlling the hydrothermal growth temperature of bare Bi₂S₃ nanoparticles. Under solar lighting, the structural and optical properties, also the photocatalytic performance was systematically evaluated for the bare Bi₂S₃, bare TiO₂ and Bi₂S₃/TiO₂ heterostructures synthesized under optimized conditions. The Bi₂S₃/TiO₂ heterostructures showed an enhanced visible-light absorption ability and photocatalytic efficiency comparing to bare TiO₂. Photoluminescence and electrochemical impedance spectroscopy measurements suggest that Bi₂S₃/TiO₂ heterostructures promoted the separation of electron-hole pairs and then enhanced the photocatalytic degradation performance for organic pollutant. The prepared heterostructures showed great stability and reusability. It also displayed enhanced photocatalytic performance for MB degradation, presenting 90% removal efficiency for 240 min, under solar light irradiation. The improved photocatalytic performance was attributed to the large Bi₂S₃ nanowires branched like nanoflowers structure on TiO₂ nanorod arrays. This performance has obviously led to a better separation of electron-hole pair and an improvement in the absorption of light in the visible-light region.

在这项工作中，我们使用了两个简单且廉价的水热步骤来合成在TiO ₂纳米棒异质结构上分支的Bi ₂ S ₃纳米花。通过控制裸Bi ₂ S ₃纳米粒子的水热生长温度，优化了沉积在TiO ₂纳米棒上的Bi ₂ S ₃的纳米级形貌。在太阳光下，系统地评估了裸Bi ₂ S ₃，裸TiO ₂和Bi ₂ S ₃ / TiO ₂的结构和光学性能，以及光催化性能。在优化条件下合成的异质结构。与裸露的TiO ₂相比，Bi ₂ S ₃ / TiO ₂异质结构显示出增强的可见光吸收能力和光催化效率。光致发光和电化学阻抗谱测量表明，Bi ₂ S ₃ / TiO ₂异质结构促进了电子-空穴对的分离，进而增强了有机污染物的光催化降解性能。制备的异质结构显示出很大的稳定性和可重复使用性。它还显示出增强的MB降解光催化性能，在太阳光照射下，在240分钟内具有90％的去除效率。改进的光催化性能归因于在TiO ₂纳米棒阵列上分支成类似纳米花结构的Bi ₂ S ₃纳米线。该性能显然导致更好地分离电子-空穴对并改善可见光区域中的光吸收。