Preparation of fixed TiO₂ film and performance of photocatalytic oxidation

Titanium dioxide films can grow in original position on TAl alloy by using the anodisation methods at different voltages and current densities. Rhodamine B can be degraded in photocatalytic (PC) and photoelectrocatalytic (PEC) oxidation reaction system. The morphology and phase composition of film were analyzed by SEM and XRD. The results indicate that TiO₂ in the film is mainly composed of anatase at 160 V and 160 mA/cm². The grainsize of TiO₂ is about 45-50 nm. During photocatalytic degradation of Rhodamine B, the removal rate goes up to 93.5 percent in 90 minutes, which indicates a high photocatalytic activity in these films. At the same time, the removal rate of Rhodamine B by 0.6 V external voltage is 33.4 percent higher than that by 0 V external voltage during the degradation of first 60 minutes, which indicates the efficiency of photocatalytic can be increased by external definite voltage.