Study On Novel Visible-Light Photocatalysts For Denitrogenation Of Simulated Oil

Three series of photocatalysts (CuO/ZnO/3A, CeO/TiO2and Ag/BiVO4) were successfully synthesized by impregnation method, sol-gel method and hydrothermal method respectively. These photocatalysts were characterized by X-ray powder diffraction method (XRD), scanning electron microscopy (SEM), UV-Vis diffuser reflectance method (DRS), N2adsorption-desorption method (BET), X-ray photoelectron spectroscopy method (XPS), transmission electron microscopy (TEM) and so on. The feasibility of using these catalysts as photocatalysts to remove nitrogen-containing compounds (NCC) from fuel oil was explored under visible light irradiation. Meanwhile, the impacts on visible light photocatalytic activity of these samples were studied under different preparation conditions of catalysts. The experimental results show that when the doping amount of zinc and copper source are9.8wt%and28.6wt%respectively, the removal efficiency of100ug/g pyridine in50mL simulated oil in the absence of0.05g CuO/ZnO/3A photocatalyst can reach74.78%under visible light irradiation for150min; When the doping amount of cerium source is8wt%, the removal efficiency of100ug/g pyridine in50mL simulated oil by CeO/TiO2photocatalyst can reach76.45%; When the Ag doping content is5wt%, the removal efficiency of50ug/g pyridine in50mL simulated oil by Ag/BiVO4photocatalyst can reach86.7%. To some extent, the photocatalytic performance of denitrogenation was affected by different preparation conditions and photocatalytic reaction conditions. The mechanism of denitrogenation by CuO/ZnO/3A, CeO/TiO2and Ag/BiVO4were studied respectively and we reach the conclusion that pyridine was finally transformed into ammonia and carbon dioxide.