Preparation Of One-dimensional Array Bismuth Vanadate Heterojunction And Study On The Regulation Of Its Interfacial Charge Behavio

Bismuth vanadate（BiVO₄）is the most promising photocatalyst because of its suitable band gap,effective visible-driven photocatalytic water oxidation ability,and good chemical stability.In this study,based on one-dimensional bismuth vanadate nanorods with directional growth[010],the preparation of heterostructures and the regulation of interfacial charge behavior were studied.The samples were characterized by field emission scanning electron microscopy（SEM）,X-ray diffraction（XRD）,ultraviolet visible absorption spectrum and energy dispersive X-ray spectrometer（EDS）.The specific work mainly has the following aspects.（1）MoS₂/BiVO₄ heterojunction composite photocatalyst was prepared by chemical bath method.The results showed that the water oxidation activity of bismuth vanadate was not positively affected by MoS₂loading.However,the generation and transfer of photogenic charge between heterojunctions are increased and the internal resistance of heterojunctions is decreased.（2）Bi₂S₃/BiVO₄ heterojunction composite photocatalyst was prepared by in situ growth method controlled by hydrothermal method.The results show that the photocurrent density of the Bi₂S₃/BiVO₄ heterojunction with a reaction time of 7 h is 11.4m A/cm².By exploring its charge behavior,it is found that the construction of Bi₂S₃/BiVO₄ heterojunction greatly increases the light capture ability,improves the separation efficiency of electron-hole pairs,and prolonging the life of carriers,thus obtaining high photocatalytic water oxidation ability.（3）Bi₂S₃/BiVO₄ heterojunction was prepared by chemical bath deposition.The results showed that the photocurrent density of 16.9 m A/cm² was obtained.ZnO nanosheet loading increases the charge transport capacity and the stability of Bi₂S₃/BiVO₄photoanode.