Figure 1. Schematic representation of the formation of the redox active electron – hole pairs at the surface of TiO2. Subsequently, electrons and positively charged holes react with redox active species in the solution to form very reactive radicals

From

Treatment of Municipal Waste Water by Photocatalytic Method

Assefa Alena, Omprakash Sahu

International Journal of Environmental Bioremediation & Biodegradation. 2013, 1(2), 49-53 doi:10.12691/ijebb-1-2-3