Mills, A. and Velenzuela, M. (2004) Photo-oxidation of water sensitized by TiO2 and WO3 in presence of different electron acceptors. Revista Mexicana de Fisica, 50 (3). pp. 287-296. ISSN 0035-001XFull text not available in this repository. (Request a copy from the Strathclyde author)
The photo-oxidation of water is studied in presence of UV-light (lambda < 400 nm) using titanium dioxide (TiO2) and tungsten oxide (WO3 , micro- and nano-crystalline) semiconductors in presence of different sacrificial electron acceptors (SEA): Fe(NO3)(2), Na2S2O8, Ce(SO4)(2), Co[(NH3)(5)Cl]Cl-2, AgNO3, HgCl2 and Cu(NO3)(2). TiO2 is 5 to 10 times more photoactive than WO3 with reference to oxygen evolution. Ag ions are the best of the SEAs, for all the semiconductors tested in the photo-redox process. No oxygen evolution is observed when Hg2+ or Cu2+ ions are used as SEAs. The effect of high (10(-2) Mol dm(-3)) and low (10(-3) mol dm(-3)) SEA concentrations is also studied but no common trend is observed. Instead, each system (i.e., SEA+H2O+Semiconductor) exhibits a different behaviour and the results are rationalised in terms of the spectral and redox potential features of the system.
|Keywords:||semiconductor photosynthesis, TiO2, WO3, water oxidation, electron acceptor, Chemistry, Physics and Astronomy(all)|
|Subjects:||Science > Chemistry|
|Department:||Faculty of Science > Pure and Applied Chemistry|
|Depositing user:||Mr Derek Boyle|
|Date Deposited:||09 Mar 2006|
|Last modified:||29 Apr 2016 07:40|