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TiO2 and Ag-TiO2/Ti-nanotubes were synthesized by electrochemical anodization and UV-light illumination photoreduction methods respectively. Scanning electron microscopy, X-ray diffraction and UV–vis spectrometry were used to characterize the nanotubes. Compared with pure TiO2, Ag loaded TiO2 showed higher visible light absorption activity. The characterization results indicate that the surface of the TiO2 nanotubes partially coated with Ag nanoparticles with an average size of about 50-80 nm. The behavior of phenol at the Ag-TiO2/Ti nanotubes array photoanode was characterized by linear voltammetry. We have investigated the effect of oxygen pressure to photoelectrocatalytic oxidation of phenol on Ag loaded TiO2 nanotubes under luminescent light irradiation. Results show that the initial rate of oxidation increases with increasing oxygen pressure. Raising the oxygen pressure in the system from 0.1 to 0.6 MPa caused the initial rate of the photoelectrocatalytic phenol oxidation to increase nearly 1.4 times.

Photoelectrocatalytic Oxidation of Phenol on Silver Loaded TiO2 Nanotube Array at High Oxygen Pressure under Luminescent Light Irradiation