Pathways and kinetics on photocatalytic destruction of aqueous phenol.
In this study, the TiO2 photocatalytic decomposition process of aqueous phenol was investigated. The intermediate products generated in the elementary reaction steps in the mineralization process were experimentally identified as hydroquinone, catechol and hydroxyhydroquinone. The concentration variations of these intermediate products with time passage were traced by high performance liquid chromatograph. The pathways of the decomposition process were given. Based on Langmuir isothermal theory and Langmuir-Hinshelwood mechanism, the multi-compounds competition kinetic model was established. In this model, the observed time-dependent concentrations of phenol and the intermediate products were simulated.
Zhang
Lianfeng
L
Department of Chemical Engineering, University of Waterloo, Faculty of Engineering, Waterloo, Ontario, Canada. L4zhang@engmail.uwaterloo.ca
Kanki
Tatsuo
T
Sano
Noriaki
N
Toyoda
Atsushi
A
D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D052918:Environmental Restoration and Remediation; D007700:Kinetics; D008956:Models, Chemical; D019800:Phenol / Q000032:analysis*; D010777:Photochemistry; D014025:Titanium / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D019800:Phenol; D014025:Titanium