Visible-light detoxification and charge generation by transition metal chloride modified titania.
Amorphous microporous metal oxides of titanium (AMM-Ti) modified with chlorides of PtIV, IrIV, RhIII, AuIII, PdII, CoII, and NiII have been prepared by the sol-gel method and characterized by various surface analytical methods. These hybrid AMM-Ti powders are catalysts for the photodegradation of 4-chlorophenol (4-CP) in aqueous solution when illuminated with visible (lambda > or = 400 or 455 nm) or UV (lambda > or = 335 nm) light. The initial rate depends on the dopant level and is highest at 3.0% Pt in the case of PtIV/AMM-Ti. When employed in a photoelectrochemical cell, the activity spectrum of the photocurrent extends downward to about 600 nm, as does the photodegradation of 4-CP. It is suggested that the metal salt acts as a redox-active chromophore, transmitting the photogenerated charges to the amorphous matrix.
Zang
L
L
Institut für Anorganische Chemie der Universität Erlangen-Nürnberg, Germany.
Macyk
W
W
Lange
C
C
Maier
W F
WF
Antonius
C
C
Meissner
D
D
Kisch
H
H
D002384:Catalysis; D002712:Chlorides / Q000737:chemistry; D002733:Chlorophenols / Q000528:radiation effects; D004785:Environmental Pollutants / Q000528:radiation effects*; D007220:Industrial Waste / Q000517:prevention & control; D008027:Light; D009930:Organic Chemicals / Q000528:radiation effects; D010782:Photolysis; D014025:Titanium / Q000737:chemistry*; D028561:Transition Elements / Q000737:chemistry; D014873:Water Pollutants / Q000528:radiation effects
D002712:Chlorides; D002733:Chlorophenols; D004785:Environmental Pollutants; D007220:Industrial Waste; D009930:Organic Chemicals; D028561:Transition Elements; D014873:Water Pollutants; C009495:titanium dioxide; C029107:4-chlorophenol; D014025:Titanium