Research on Treating Tannery Wastewater by Using Nanometer-Sized TiO2 Glass Thin Film

Nanometer-sized TiO₂ thin films were prepared by sol-gel processing. Photocatalytic degradation of tannery wastewater has been studied by using the TiO₂ films as photocatalyst. In the static experiments, by using the low pressure UV as light source, the best condition is that the time of light-catalyzed is 4 hours, initial pH is 6.7 and the volume of H₂O₂ is 0.3% (v/v). Then, we carried on the dynamic experiment under this condition by using the high pressure UV as light source and found that the removal rate of CODcr reached 85.79% after 40 min of irradiation and the removal rate of Cr⁶⁺ reached 84.62% after 110 min of irradiation. Besides, the effect of degradation of tannery wastewater improved by using the Fe³⁺/ TiO₂ thin films.