Abstract: A series of nanofibers, including carbon nanotubes（CNTs）-doped and CNTs/La³⁺co-doped TiO₂ nanofibers were prepared by electrospinning. With heavy metal Cr（VI）as the target degradation product, the effects of CNTs doping , La3+ doping and CNTs co-doping as well as the initial pH value of degradation on the photocatalytic activity of TiO₂ were studied. The results showed that the photocatalytic activity of the prepared CNTs-doped TiO₂ was higher than that of pure TiO₂, and the proper amount of La³⁺/CNTs codoping further improved the photocatalytic activity of TiO₂. The ideal doped content was 15% CNTs and 0.05% La³⁺. The degradation rate of Cr（VI）could reach 99.86% under visible light irradiating 100 min when the CNTs/La³⁺ co-doped TiO₂ was 1.0 g/L, the initial Cr（VI）concentration was 10mg/L and pH was 4.

Key Words: carbon nanotubes（CNTs）; rare earth La³⁺; TiO₂ nanofiber; electrospinning; photocatalytic