Sulu çözeltilerden astrazon orange G boyar maddesinin TiO2 ve ZnO fotokatalizörleriyle gideriminin incelenmesi

Organic contaminants from textile effluents are harmful to the environment by degrading the quality of the aquatic environment. So, these contaminants must be reduced to levels that are not harmful to the environment before disposal. Among the available chemical methods, heterogeneous photocatalytic oxidation has been found particularly effective in removing a large number of persistent organics in water. In this study, photocatalytic removal of Astrazon Orange G dye, which is widely used in the textile industry was investigated. Photocatalytic degradation was carried out in an air-fed and batch column reactor, titanium dioxide, zinc oxide photocatalysts, and a UV-C light source. The effects of certain parameters such as the amount of catalyst, initial concentration of dye, pH of the solution, air flow rate, and temperature were examined. Optimum pH values for dye and TOC removals were determined as 10 and 6, respectively. The central composite design of response surface methodology was used to optimize the effect of initial dye concentration, amount of catalyst, and reaction time. Optimal conditions for photodegradation of dye, were a dye concentration of 150 mg/L, the reaction time of 70 minutes, and the amount of catalyst of 7.5 g L-1 using TiO2 and 8.6 g L-1 in using ZnO. Maximum dye and TOC removal yields were determined as 98.5% and 67.9% for TiO2 whereas 95.62% and 38.13%, for ZnO, respectively. The zero and first-order kinetic models were applied and reaction kinetics were found to follow the first-order type kinetic model. Finally, the process was applied to synthetic wastewater to investigate the potential performance of the method.