中文摘要：

为了研究过渡金属电荷补偿共掺TiO_2中载流子的分离与复合问题,本文采用溶胶-凝胶法制备了Mo单掺和（Mo＋Co）共掺TiO_2,测量了样品的光催化性能.实验结果表明,Mo单掺TiO_2比（Mo＋Co）共掺TiO_2有较低的载流子复合率以及更好的光催化性能.在不同比例（Mo＋Co）共掺样品中,电荷完全补偿共掺样品的载流子复合率最高,而可见光催化效果却是所有共掺样品中最好的,其原因可能是它对可见光的吸收相对较高.讨论了钼钴电荷补偿共掺对载流子分离与复合的影响机制.

英文摘要：

In order to investigate the charge carrier recombination mechanism of transition metal charge compensa- tion codoped TiO2, Mo doped and （Mo＋Co） codoped TiO2 nanopowders were synthesized by sol-gel method and the photocatalytic property of the samples were studied. It was found that Mo monodoped TiO2 had better photocatalytic activity than （Mo＋Co） codoped TiO2 due to low recombination rate and better visible light absorption activity than co- doped samples. Among the codoped samples, the one with charge fully compensated had the largest charge recombina- tion rate, but the best photocatalytic property. The higher photocatalytic activity of the charge fully compensated co- doped sample may be due to higher visible light absorption compared with other codoped samples and the mechanism for charge carrier recombination was also discussed.