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

摘要

Endeavoring to the imperative and challenging issue of devel- oping ecient and applicable visible light responsive photocatalysts, we demonstrate a general and versatile route for modifying TiO2-based photocatalysts through surface chlorination, making the chlorinated photocatalysts work eciently in both the UV and visible regions. The chlorine acted not only as a key component, endowing TiO2 with fascinating visible light activity, but also as an eective promoter, rendering both visible light and UV photocatalysts with remarkably enhanced activity. The increase in oxygen vacancies and the chain transfer reaction initiated by chlorine radicals were mainly responsible for the remarkable improve- ment in activity.