关键词: WO3;Ag2O;光催化;亚甲基蓝

Abstract: Due to WO3 with the band bap of about 2.7 eV, visible light can be used to stimulate the photocatalytic activity, which greatly improve the utilization rate of sunlight.However, the photocatalytic activity of pure WO3 nanopowder is relatively low.In order to solve this problem, WO3 nanonetworks were used as the 3D frame for loading Ag2O nanoparticles.Ag2O/WO3 heterostructures composite were prepared with different molar ratio of WO3 to Ag2O via a simple chemical precipitatation method.To explore the photocatalysis of the heterostructures, the photodegradation of methylene blue was carried out under simulated sunlight irradiation.Photocatalytic activity was enhanced by loading Ag2O nanoparticles on the WO3 networks and the optimum molar ratio of WO3 to Ag2O is 1∶2.Then the photocatalysis decreased with the excessive amount of Ag2O, which may be attributed to the recombination of electrons form WO3 and holes from Ag2O.

Key words: Due to WO3 with the band bap of about 2.7 eV, visible light can be used to stimulate the photocatalytic activity, which greatly improve the utilization rate of sunlight.However, the photocatalytic activity of pure WO3 nanopowder is relatively low.In order to solve this problem, WO3 nanonetworks were used as the 3D frame for loading Ag2O nanoparticles.Ag2O/WO3 heterostructures composite were prepared with different molar ratio of WO3 to Ag2O via a simple chemical precipitatation method.To explore the photocatalysis of the heterostructures, the photodegradation of methylene blue was carried out under simulated sunlight irradiation.Photocatalytic activity was enhanced by loading Ag2O nanoparticles on the WO3 networks and the optimum molar ratio of WO3 to Ag2O is 1∶2.Then the photocatalysis decreased with the excessive amount of Ag2O, which may be attributed to the recombination of electrons form WO3 and holes from Ag2O.