关键词: 纳米二氧化钛, 光催化, 应用

Abstract: Mechanism，structure，basic properties of TiO2 photocatalyst as well as present researches on modification etc. were introduced in detail.Influences of crystal phase，mixture phase，and nano-size effect on photocatalytic properties were discussed.By analyzing the mechanisms of defects formed by doping elements，the effects of doping on photocatalytic properties were summarized.Problems existed in technique and application of photocatalytic material were reviewed.Meanwhile，the research ideas and directions in the future were indicated.

Key words: nano-sized TiO2, photocatalyst, application