Figure 2 Schematic demonstration of the photochemical steps in semiconducting TiO2. A: Light irradiation to TiO2 surface, B: generation of electrons and holes as charge carriers, C: recombination of the electrons and holes, D and E: reductive and oxidative pathways of substances absorbed on TiO2 sites, and F: redox reaction to decompose organic contaminants in water.

summarized in a book by Ollis and Al-Ekabi [3], discussed by Hoffmann and his coworkers [5,6], and overviewed in several review articles [7—11]. The primary photochemical events in TiO2 semiconductors are simplified in Fig. 2. In its electronic structure, TiO2, like other semiconductors, exhibits a void energy region between the top of the filled valance band and the bottom of the vacant conduction band, which is called the band gap (BG).

Was this article helpful?

0 0
Going Green For More Cash

Going Green For More Cash

Stop Wasting Resources And Money And Finnally Learn Easy Ideas For Recycling Even If You’ve Tried Everything Before! I Easily Found Easy Solutions For  Recycling Instead Of Buying New And Started Enjoying Savings As Well As Helping The Earth And I'll Show You How YOU Can, Too! Are you sick to death of living with the fact that you feel like you are wasting resources and money?

Get My Free Ebook

Post a comment