Due to the rising of environmental crisis caused by the man-made pollutants from human beings, especially air pollutants. Development of strong photocatalyst for air pollutant degradation becomes one of the directions. Among them, titania (titanium dioxide, TiO₂) family materials were extensively studied in the past two decades, due to its strong activity in the photocatalytic reactions. While the drawback of TiO₂ is its large bandgap that limit its applications, series of modification techniques were developed to enhance its catalytic activity and light sensitivity. Other metal oxide based materials was also developed recently as TiO₂ replacement for photocatalyst. In this review, the background of TiO₂ based materials acted as photocatalyst was discussed in details, from the neat TiO₂ to the chemically modified TiO₂ materials developments. Their basic properties, and role in the air pollutant removal were covered. Solution to overcome the drawback of TiO₂ via developing other metal oxide based photocatalyst was also discussed. The forecast on future development of titania family materials in environmental applications was also proposed.

由于人类的人为污染物，特别是空气污染物引起的环境危机的加剧。开发用于降解空气污染物的强光催化剂成为发展方向之一。其中，二氧化钛（二氧化钛，TiO ₂）族材料由于其在光催化反应中的强活性而在过去的二十年中得到了广泛的研究。尽管TiO ₂的缺点是其较大的带隙限制了其应用，但开发了一系列改性技术以增强其催化活性和光敏性。最近还开发了其他基于金属氧化物的材料，以代替TiO ₂代替光催化剂。在这篇评论中，TiO ₂的背景从纯TiO ₂到化学改性的TiO ₂材料的发展，都对作为光催化剂的基体材料进行了详细讨论。涵盖了它们的基本特性以及在去除空气污染物中的作用。还讨论了通过开发其他基于金属氧化物的光催化剂来克服TiO ₂缺点的解决方案。还提出了对二氧化钛族材料在环境应用中未来发展的预测。