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Scanning electrochemical microscopy investigation of the photodegradation kinetics of 4-chlorophenol sensitised by TiO2 films
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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. doi:10.1039/b412328j ISSN 1463-9076.
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Official URL: http://dx.doi.org/10.1039/b412328j
Abstract
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 | ||||
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Subjects: | Q Science > QD Chemistry Q Science > QC Physics |
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Journal or Publication Title: | PHYSICAL CHEMISTRY CHEMICAL PHYSICS | ||||
Publisher: | ROYAL SOC CHEMISTRY | ||||
ISSN: | 1463-9076 | ||||
Official Date: | 2004 | ||||
Dates: |
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Volume: | 6 | ||||
Number: | 22 | ||||
Number of Pages: | 7 | ||||
Page Range: | pp. 5218-5224 | ||||
DOI: | 10.1039/b412328j | ||||
Publication Status: | Published |
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