Abstract: TiO2 was p repared by sol - gel technique with tetrabutyl titanate and ethanol as p recursor, and the supported TiO2 cata2 lysts on active carbon were p repared by soak and sinteringmethod. The effects of initial phenol concentration and quantity of catalyst on the photoelectrocatalytic reaction rate of phenolwere investigated with ultraviolet light. The kinetics of formaldehyde degradation reac2 tion can be described by Langmuir - HinsheL lwood model.