Abstract: TiO2 photocatalytic oxidation has the advantages of high efficiency，stability，and no pollution for gaseous pollutants treatment. Photocatalytic reaction efficiency is affected by the inherent characteristics of TiO2 and photocatalytic reaction conditions. The research progress of the influence factors of TiO2 photocatalytic purification of exhaust gas was summarized from inherent properties (such as crystal type，particle diameter，existence form of TiO2，immobilization，modification by doping，and noble metal deposition) of TiO2 and photocatalytic reaction conditions (such as gas initial concentration，flow rate，oxygen content，light source，light intensity，humidity and reaction temperature). Deactivation and regeneration of TiO2 in the gas phase photocatalytic process were introduced，and future research on TiO2 photocatalytic purification would be focused on preparation and application of visible-light photocatalyst，mechanism of photocatalytic degradation of multicomponent gaseous pollutants and influence factors.

Key words: titanium dioxide, photocatalysis, gaseous pollutants, influencing factors

摘要： TiO2光催化技术作为处理气态污染物的一种手段，具有高效、稳定、无二次污染等优点。光催化反应效率的高低受到TiO2自身性质、光催化反应工艺条件等因素的影响。本文分别从TiO2晶型、晶粒尺寸、TiO2的存在形态、TiO2的负载、掺杂改性、贵金属沉积等与TiO2材料性质相关的因素以及废气初始浓度与流速、废气中的含氧量、湿度、光源和光照强度、反应温度等光催化反应的工艺条件两方面，概述了目前关于TiO2光催化净化废气影响因素的研究进展，介绍了TiO2在气相光催化过程中的失活与再生，并从可见光催化剂的制备应用、多组分污染物气相光催化降解机理及影响因素等方面对未来TiO2光催化研究方向提出建议。

关键词: 二氧化钛, 光催化, 气态污染物, 影响因素