Study On Synergistic Effect Of The Photocatalytic Degradation Of Cu～(2+) And Reactive Blue 4

In recent years, the use of TiO₂ photocatalytic reaction to remove the pollutants caused great concern. While most of the research was tend to focus on the photocatalytic oxidation of organic pollutants or reduction of the metal ions, rarely associated with the co-existed pollution systems. As many practical pollution systems may contain heavy metal ions and organic pollutants at the same time, therefore, the study of the photocatalytic degradation of pollutants which in the co-existence of organic pollutants and heavy metal ion will provide a meaningful treatment method for such a wastewater.Irradiated by UV lamp, the photocatalytic removal of Cu²⁺ and reactive blue 4 in the TiO₂ suspension system was studied in this paper. The results showed that under certain experimental conditions, the TiO₂ dosage, the initial concentration of matrix solution and the solution pH value all exist an optimum value. In the presence of oxygen, the excited electron was trapped and the electron / hole recombination was inhibited, the number of hydroxyl radicals in the solution increase as a result, which improved the efficiency of photocatalytic oxidation of reactive blue 4 while limited the efficiency of the reduction of Cu²⁺. Through a linear regression analysis between theoretical and experimental data, concluded that the photocatalytic decolorization and mineralization of reactive Blue 4 and follows the first order kinetic equation.The paper also reactive blue 4 and Cu²⁺ systems coexist on the photocatalytic activity Blue 4 for a more concerted role a comprehensive study. The results showed that the enhancement of the photocatalytic oxidation rates of reactive blue 4 in the presence of copper(â…¡) ion was obviously observed in the decolorization while smaller in the photocatalytic degradation CODcr of the dye, which can deduced that the photo-mineralization occurred after the photo-decolorization and then gradually reduced to little inorganic molecule.The status of copper on the surface of TiO₂ after photo-reduction was detected by means of X-ray photoelectron spectroscopy (XPS). Through the analysis of Total Organic Carbon (TOC), UV-Vis, Chemical Oxygen Demand (COD) and Biological Oxygen Demand (BOD), the process of reactive blue 4 degradation was determined and mechanism ofphotocatalysis was deduced.