Photochemical reduction of carbonate to formaldehyde on TiO2 powder

✍ Scribed by K. Chandrasekaran; J.K. Thomas

• Book ID: 103022184
• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 330 KB
• Volume: 99
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(83)80259-0

✦ Synopsis

Photochemical reactions at semiconductor particle surfaces have been used to drive energy uphih reactions to store light energy. Carbonate radical anion was found to be intermediate when carbonate was used to intercept the photogenerated hole on TiOz by exciting with light energy of more than 3.2 eV. The carbonate anion radicai undergoes secondary reactions on the surface to give formaldehyde. The chemical energy stored in this reaction is 580 M/mole. The quantum yield for the formation of HCHO is 4 X 1 0m3, but e&tended irradiation leads to ioss of formaldehyde_