【摘要】 综述了TiO2颗粒表面光催化反应过程的研究进展。以电子空穴机理为主线,结合最新研究结果,分析了电子空穴机理的具体反应历程。并按照光生电子空穴分离、自由基产生和自由基氧化3个过程分析了TiO2颗粒表面光催化反应历程,重点分析了自由基产生过程,明确了Ti3+和O-2等基团的形成过程和在光催化反应过程中的作用。基于TiO2光催化反应历程,提出了TiO2光催化活性的调控措施。通过提高电子和空穴复合几率,可抑制TiO2的光催化活性;通过减小禁带宽度,或抑制电子和空穴复合,可提高TiO2的光催化活性。更多还原

【Abstract】 The photocatalytic reaction process on titania particle surface and its research progress were analyzed.According to the electron-hole mechanism the detailed reaction process was summarized combining the newest research achievements,including the separation of the photoelectron and photohole,formation of the free radicals and oxidation of the free radicals.The formation of Ti3+ and O2-and their roles in the photocatalytic process were clarified.Based on the photocatalytic reaction mechanism,the control of TiO2 photocatalytic activity was elucidated systematically.The photocatalytic activity can be restricted by providing plenty recombination sites and increasing capture capability for photoelectrons and photoholes with a specially coated film.The activity can be increased by reducing the band gap or doping specific ions to form capture sites for restriction of the recombination of photoelectron and photohole.更多还原