Abstract Four metal ions (M: Pt, Pd, Cu and In) modified TiO2 (TiO2-M) thermal catalysts were prepared. The metal ions exist on the surface of TiO2 as O-M-O and/or O-M-Cl species. TiO2–Pd and TiO2–Pt samples exhibit much better thermal catalytic activity than TiO2, TiO2–Cu and TiO2–In. Due to the efficient thermal excited electrons transfer from the valence band to the conduction band through quasi-continuous energy levels of Pd or Pt species, the TiO2–Pd and TiO2–Pt catalysts exhibited significant thermal catalytic activity for degradation of HCHO. Furthermore, the relationship between band structure and redox ability of thermal charge carriers for TiO2-M, as well as the generation ability of ROS (reactive oxygen species, for instance, O2− and·OH) in thermal catalysis system are investigated systematically. This work revealed that the quasi-continuous energy level in the band gap of semiconductors is one of the key factors to achieve efficient thermal catalytic performance over thermal-functional materials.

中文翻译：

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金属离子(Cu、in、Pd和Pt)修饰TiO2对HCHO降解的热催化机理

摘要 制备了四种金属离子（M：Pt、Pd、Cu、In）修饰的TiO2（TiO2-M）热催化剂。金属离子作为 OMO 和/或 OM-Cl 物质存在于 TiO2 表面。TiO2-Pd 和 TiO2-Pt 样品表现出比 TiO2、TiO2-Cu 和 TiO2-In 更好的热催化活性。由于热激发电子通过 Pd 或 Pt 物质的准连续能级从价带转移到导带，TiO2-Pd 和 TiO2-Pt 催化剂对 HCHO 的降解表现出显着的热催化活性。此外，系统地研究了TiO2-M的热电荷载流子的能带结构与氧化还原能力之间的关系，以及ROS（活性氧，例如O2-和·OH）在热催化体系中的产生能力。