Scanning electrochemical microscopy investigation of the photodegradation kinetics of 4-chlorophenol sensitised by TiO2 films
UNSPECIFIED. (2004) Scanning electrochemical microscopy investigation of the photodegradation kinetics of 4-chlorophenol sensitised by TiO2 films. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 6 (22). pp. 5218-5224. ISSN 1463-9076Full text not available from this repository.
Official URL: http://dx.doi.org/10.1039/b412328j
Scanning electrochemical microscopy (SECM) has been used to investigate quantitatively the photodegradation kinetics of 4-chlorophenol (4-CP), in aerated and oxygenated aqueous solutions, at back-illuminated TiO2 films deposited from a suspension of Degussa P25 TiO2 powder at the end of an optical fibre. A potentiometric Ag/AgCl ultramicroelectrode (UME), positioned at a known distance above the TiO2 film, was used to monitor directly the Cl- production from the photodegradation of 4-CP. The effects of both light intensity and 4-CP concentration were investigated and the associated kinetics were determined. Amperometric measurements with a Pt UME demonstrated that O-2 was depleted significantly adjacent to the TiO2 surface under these conditions. A theoretical model, which employs a Langmuir-Hinshelwood type kinetic equation, has been developed to interpret the kinetics of the photodegradation process and determine the associated quantum efficiency.
|Item Type:||Journal Article|
|Subjects:||Q Science > QD Chemistry
Q Science > QC Physics
|Journal or Publication Title:||PHYSICAL CHEMISTRY CHEMICAL PHYSICS|
|Publisher:||ROYAL SOC CHEMISTRY|
|Number of Pages:||7|
|Page Range:||pp. 5218-5224|
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