摘要
TiO2薄膜是解决TiO2回收的有效方法,缺点是TiO2活性低,寻找合适的载体以及提高TiO2薄膜的光催化活性,是TiO2负载薄膜技术需要解决的核心问题。研究了13种离子对负载在釉面瓷砖、玻璃、陶瓷、钛片、铝片和不锈钢片6种载体上TiO2薄膜的掺杂,并从界面材料结构、双电层结构等方面讨论了离子掺杂与载体对TiO2薄膜光催化活性的影响。结果表明,TiO2薄膜的离子掺杂效果不仅和离子掺杂浓度、种类有关,而且还与载体类型有关。TiO2薄膜和非金属载体主要形成复合半导体结构,改善掺杂离子对载流子的捕获能力。金属载体与TiO2薄膜之间主要形成肖特基势垒,有利于电子与空穴的分离。载体与TiO2薄膜之间形成的界面双电层结构能改变离子捕获中心与TiO2半导体费米能级间的相对位置,从而提高或降低离子对载流子的捕获能力。
The main disadvantage with TiO2 thin film, an effective way for recovery of TiO2 in the photomtalyst, is its low activity. The key to TiO2 thin fdrn catalysis is to find suitable substrates to enhance photocatalytic activity of TiO2 thin fdm. Doping of 13 metal ions into TiO2 thin film carried on 6 suhstrates （ceramic tile, glass, ceramic, titanium slice, aluminum slice and stainless steel slice） were studied, and irrfluences of the doping on photo- catalytic activity of TiO2 thin film were discussed from interface structure and double electronic layer between substrate and TiO2 thin film. The results showed that effects of ion doping were dependent upon not only the ion dopant and its conoentration, but also the types of substrates. Composite seminconductor formed between TiO2 thin film and nonmetal suhstrate, which enhanced the carrier trap capability of metal ion dopants. Schottky barrier formed between metal substrate and TiO2 thin fdm favored separtion of photogenetated and photogenerated. Doble electronic layer structure between substrates and TiO2 thin film changed the relative position between trap position of metal ions and Femi level of TiO2 semiconductor, accordingly lowered or enhanced the trapping capability of metal ion to carriers.
出处
《工业催化》
CAS
2005年第12期52-57,共6页
Industrial Catalysis
基金
国家自然科学基金项目(20466001)
广西科技厅重点项目(2004ZD01)
