Surface Chlorination of TiO2-Based Photocatalysts: A Way to Remarkably Improve Photocatalytic Activity in Both UV and Visible Region

Endeavoring to the imperative and challenging issue of developing efficient and applicable visible route for modifying TiO2-based photocatalysts work efficiently in both the UV and visible regions. The cholorine acted not only as a key component, endowing TiO2 with fascinating visible light activity,but also as an effective promoter rendering both visible light and UV photocatalysts with remarkly enhanced activity. The increase in oxygen vacanies and the chain transfer reaction initiated by chlorine radicals were mainly responsible for the remarkable improvement in activity.