纳米级TiO_2光催化氧化机理及其在污染治理中的应用

Study on the photocatalysis mechanism on nanosized TiO_2 photocatalyst and its application for pollutant treatment

纳米级TiO2因其活性高、稳定性好而在污染物治理领域被广泛用做光催化剂。通过纳米TiO2半导体的光催化效应,在材料内部由吸收光激发电子,产生电子—空穴对,即光生载流子,并迅速迁移到材料表面,激活材料表面吸附氧和水分,产生活性羟基自由基(.OH)和超氧阴离子自由基(.O2-),从而转化为一种具有安全化学能的活性物质,起到矿化降解环境污染物和抑菌杀菌的作用。主要阐述了TiO2的光催化机理,论述了TiO2光催化剂在有机废水和VOCs处理等方面的应用。提出了TiO2光催化氧化同时脱硫脱氮技术研究的设想。

The photocatalysis mechanisms of action for TiO2 photocatalyst are investigated. The applications about TiO2, photocatalyst are discussed such as organic wastewater handle, VOCs in atmosphere and so on. The perspective of simultaneous desulfurization and denitrification based on TiO2 photocatalysis is proposed. The study direction in the future is pointed out.