title: Activity and selectivity of photocatalysts in photodegradation of phenols.
abstract: Photodegradation of phenol and 4-chlorophenol over six different TiO(2) samples was tested in order to establish whether an interconnection between the activity and selectivity of photocatalysts exists. The obtained experimental data were analyzed using correlation analysis. Some correlations between the activity in phenol(s) photodegradation and selectivity toward formation of primary intermediate products were established. The type of correlations depends on the type of studied photoreactions. The discussion of the observed correlations between the activity and selectivity of photocatalysts is given in terms of the difference of surface concentrations of electrons and holes and corresponding surface active sites which might be dependent on the types of dominating surface faces. On the basis of the obtained results of correlation analysis it was assumed that a higher activity of photocatalysts could be achieved provided that both reduction and oxidation reaction pathways occur with equally high efficiency.
authors.affiliation: Department of Photonics, V.A. Fock Institute of Physics, Saint-Petersburg State University, Ulianovskaia Str. 1, Petrodvoretz, St.-Petersburg 198504, Russia. emeline av@hotmail.com
authors.forename: A V
authors.initials: AV
authors.lastname: Emeline
authors.forename: X
authors.initials: X
authors.lastname: Zhang
authors.forename: T
authors.initials: T
authors.lastname: Murakami
authors.forename: A
authors.initials: A
authors.lastname: Fujishima
mesh_terms: D002384:Catalysis; D002733:Chlorophenols / Q000737:chemistry* / Q000528:radiation effects; D008027:Light; D019800:Phenol / Q000737:chemistry* / Q000528:radiation effects; D010782:Photolysis; D014025:Titanium / Q000737:chemistry*
chemical_list: D002733:Chlorophenols; C009495:titanium dioxide; D019800:Phenol; C029107:4-chlorophenol; D014025:Titanium