The Effect of Air Electrode/AC Supported on Photocatalytic TiO2 for Photo Degradation

The photo catalytic degradation of activated red in the aqueous solution was studied using TiO2 supported on air electrode and active carbon (AC) as photo catalysts. It was found that the photo catalytic reaction rate of TiO2 was obviously increased by the presence of air electrode and AC supported. The air electrode which has functions of synthesizing H2O2 in situ and photocatalysis was reported. The results also implied that biasing of the electrode at +0.5V led to efficient charge separation. The current density of air (oxygen) electrode had effect on the oxidation rate of azo dye molecule, i=15 mA/cm2, and the rate could reach maximum. With AC mass fraction of about 21% the oxidation rate for TiO2/AC was obviously larger than that for TiO2, but the result was contrary to this for higher AC mass fraction (>30%). The experiment results showed that because TiO2 was supported on active carbon, the effective surface area of the photo catalysis and their absorbability for organic molecules can be increased. The pH in solution had effect on the oxidation rate of organic molecules.