Preparation And Photocatalytic Properties Of One-dimensional Nano-molybdenum Trioxide

With the development of the global industrialization process,wastewater emissions remain high,how reasonable and efficient treatment of wastewater has aroused a widespread concern in society.Using photocatalytic degradation of wastewater is one of the most effective solutions.Molybdenum trioxide?MoO₃?has become a new research object in the field of photocatalysis because of its large specific surface area and electron transport along the axis.However,due to the large band gap of MoO₃,its photocatalytic degradation ability is limited.And graphene?GO?has the characteristics of high surface energy,good hydrophilicity and good photocatalytic performance.In order to improve the photocatalytic degradation performance of MoO₃,one-dimensional nano-MoO₃ was prepared by traditional precipitation method and microwave-assisted ultrasonic synthesis method,and the photocatalytic degradation performance of MoO₃ was improved by adding GO.The process parameters such as addition amount of nitric acid,reaction temperature and reaction time were investigated in the process of preparing MoO₃ by two different methods.The morphologies,structures and photocatalytic properties of MoO₃ obtained by different preparation methods were compared by XRD,TEM and DRS.The results were as follows:?1?MoO₃ was prepared by precipitation method.When VHNO₃:VH₂O = 4:1,the reaction temperature was 70 ? and the reaction time was 1.5 h,the photocatalytic activity of h-MoO₃ could be prepared.The degradation rate of rhodamine B was Reaching 94.2%.?2?MoO₃ was prepared by microwave-assisted ultrasonic synthesis method.When the ultrasonic power was 400 W,the microwave power was 75 W,VHNO₃:VH₂O =1:1,the reaction temperature was 90 ? and the reaction time was 1.5 h,the photocatalytic activity of ?-MoO₃ could be prepared.The degradation rate of rhodamine B up to 96%.By comparing the two methods,GO@MoO₃ was synthesized in situ by microwave-assisted ultrasonic synthesis.The process conditions were consistent with the preparation of ?-MoO₃ Under the conditions of 5%of graphene addition and 3.5 h,The best photocatalytic performance of GO@MoO₃ composite products.The morphology,structure,and structure of GO @ MoO₃ were characterized by XRD,TEM,the degradation rate of rhodamine B up to 100%.