Abstract: In this paper，the recent progress in photocatalytic reduction of CO2 using different titania-based photocatalysts，including pure titania，metal-doped titania，nonmetal-doped titania，co-doped titania，titania-based nanocomposites，organic photosensitizer modified titania and other titania photocatalys were introduced. Then the phtocatalytic activities of these catalysts were compared；the advantages and machanisms of them were addressed；and the effects of photocatalytic reactors and experimental conditions，such as irradiation time，reaction temperature，CO2 pressure and mole ratio of H2O to CO2 on the activities of titania-based catalysts，were discussed. Through the joint use of several modified measures and the optimization of reaction system，the improvement of photocatalytic reaction activity and utilization of light would be the development trend and focus of future research. Challenges and potential application prospects of photocatalytic reduction of industrial flue gas，especially oxyfuel combustion flue gas，were presented.

Key words: titania, photocatalytic reduction, carbon dioxide, industrial flue gas

摘要： 综述了Ti基CO2光催化还原的研究进展，简要介绍了近年来用于光催化还原CO2的Ti基催化剂，包括纯TiO2催化剂、金属掺杂TiO2催化剂、非金属掺杂TiO2催化剂、共掺杂TiO2催化剂、Ti基纳米复合催化剂、有机光敏化剂修饰TiO2催化剂及其它TiO2催化剂等，比较了各类TiO2基催化剂光催化活性，介绍了其相应的反应机理及优缺点，讨论了光照时间、反应温度、CO2分压力、H2O和CO2摩尔比、光反应器等因素对光催化活性的影响。通过综合运用多种改性措施，开发高效Ti基催化剂并优化反应系统以提高光催化反应活性及光利用率将会成为CO2光催化还原领域重点研究内容与发展趋势，最后展望了利用该技术光催化还原工业烟气，尤其是富氧燃烧烟气的潜在应用前景与挑战。

关键词: 二氧化钛, 光催化还原, 二氧化碳, 工业烟气