In this paper, the Z-scheme photocatalysts of TiO₂ nanotube arrays (TiO₂ NTs) modified by CdTe and Ag nanoparticles were prepared by a simple hydrothermal method. The photocatalytic performances of CdTe/TiO₂ NTs and CdTe/Ag/TiO₂ NTs toward the reduction of Cr⁶⁺ and the degradation of methylene blue (MB) were researched. The MB degradation efficiency reached 100.0% after 2 h visible light irradiation, and the removal of Cr⁶⁺ reached 95.9% after 3 h. The transient photocurrent and open-circuit voltage of CdTe/Ag/TiO₂ NTs were higher than the other two samples. Furthermore, the effect of light intensity and pH on the photocatalytic performances was verified. The hydrogen production of the photocatalysts under visible light was also researched with the assistance of external voltage and sacrificial agents, which provides a new direction for the development and utilization of solar energy.

本文采用简单的水热法制备了CdTe和Ag纳米粒子修饰的TiO ₂纳米管阵列（TiO _{2 NTs）的Z型光催化剂。}研究了CdTe/TiO ₂ NTs和CdTe/Ag/TiO ₂ NTs对Cr ⁶⁺还原和亚甲蓝(MB)降解的光催化性能。可见光照射2 h后MB降解效率达到100.0%，3 h后Cr ⁶⁺去除率达到95.9%。_{CdTe/Ag/TiO 2}的瞬态光电流和开路电压NTs 高于其他两个样本。此外，验证了光强和pH对光催化性能的影响。在外加电压和牺牲剂的辅助下，研究了可见光下光催化剂的制氢，为太阳能的开发利用提供了新的方向。