Ozone modification as an efficient strategy for promoting the photocatalytic effect of TiO2 for air purification.

We report a "two-bird-with-one-stone" strategy for photocatalytic air purification through the positive effect of ozone by surface modification over commercial TiO2. The understanding of the photocatalytic degradation mechanism of volatile organic compounds is refreshed on the basis of in situ spectroscopic and theoretical studies.