TiO2较宽的禁带宽度和低的量子转换效率限制了其实际的应用,对TiO2进行改性以克服上述两方面问题一直是光催化领域研究的重点.稀土元素因其独有的电子结构和光学性质,在离子掺杂改性TiO2研究中受到重点关注.主要介绍了稀土离子掺杂改性TiO2所形成杂质能级的位置对改善其光催化性能的作用机理；综述了稀土离子掺杂对TiO2的晶型、晶粒尺寸和光谱吸收的影响；最后提出了目前研究存在的问题及发展趋势.
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