Photocatalyst Tio <sub> 2 </ Sub> / Al Preparation And Performance Study

Flake aluminum powder is of good effect on light reflection. In order to improve photocatalysis property by utilizing light reflection property of flake aluminum powder, aluminum coated by titanium dioxide were studied. The immobilized photocatalyst TiO2/Al were prepared through using tetrabutyl titanate (TBT) as raw material using sol-gel method. The influencing factors such as the ratio of water to TBT, hydrolysis temperature, pH value, reaction time, and calcining temperature have been investigated. Thereafter, to further the optimization of preparation conditions, the orthogonal optimization experiment was carried out. The obtained optimal preparation conditions were as follows:the mole ratio of water to TBT was 40, hydrolysis temperature was 35℃, pH value was 4.5, reaction time was 5h, calcining temperature was 600℃.The immobilized photocatalyst TiO2/Al were characterized by XRD, FT-IR and laser particle size analysis. The results showed that the crystallization degree of the TiO2/Al increased with increasing calcining temperature, when calcining temperature was highter than 600℃, the anatase TiO2 began to appear. The existence of titanium dioxide on the surface of flake aluminum was confirmed as the characteristic vibrations of Ti-O, Ti-O-Si were founded. Comparing to unloaded flake aluminum powder, the TiO2/Al showed uniform partice size distribution, which was mainly caused by the joint function of the tiny titanium dioxide paticles.Furthermore, the photocatalytic efficiency of TiO2/Al have been investigated according to change the initial concentration of MB, catalyst amount, reuse times. The experiment results indicated that when the initial concentration of MB was 15mg/L, photocatalyst addition amount was 2g/L in alkaline condition, the degradation rate of MB solution achieved 99.5% under UV-lamp irradiation for 6h. And then the kinetic of photocatalytic oxidation of immobilized photocatalyst was discussed. The result proved that the photocatalytic oxidation reaction could be regarded as the first-order kinetic reaction.