Study On The Preparation And Performance Of ZnO@PAN Nanofiber Composite Membrane

In recent years,the preparation and performance of electrospun nanofiber composite membranes loaded with metal oxides has become one of the important hotspots in the research and development of new materials.The electrospun nanofiber composite membrane supporting the metal oxide not only has the ultra-high specific surface area of the nanofiber composite membrane,but also has the special physical and chemical properties of the metal oxide.Electrospun nanofiber membranes loaded with metal oxides have been widely used due to their diversity of properties,and their application prospects are also very broad,such as in environmental engineering,medical science,energy storage,sensors,military,etc.In this paper,ZnO nanowires were loaded on electrospun PAN nanofiber membrane by hydrothermal reaction.Three influencing factors of the growth state of ZnO nanowires were studied,including:the ratio of PAN and zinc acetate in electrospinning solution,thermal decomposition reaction temperature and hydrothermal reaction environment.The ZnO@PAN nanofiber membrane was characterized by SEM,TG,FTIR and other tests.When the ratio of PAN and Zn(AC)2 in electrospinning solution was 10:1.5,It was found that the length and fineness of ZnO nanowires on the PAN nanofiber membrane is the best with 150 ℃.At the same time,a volume ratio of 20:1 ammonia water is added to the hydrothermal reaction.Comparing the photocatalytic performance of three groups of ZnO@PAN nanofiber membranes at different decomposition temperatures in 500W UV light for rhodamine B solution,when the ratio of PAN to Zn(AC)2 is 10:1.5.By analyzing the strength,BET,catalytic effect,catalytic kinetic and catalytic stability of the three groups of samples,it was found the strength of ZnO@PAN nanofiber membrane can reach above 0.44MPa,and the specific surface area can reach 39.049m’/g.The degradation efficiency of rhodamine B was 66.73%within two hours.After 5 cycles of experiments,the degradation performance was still above 60%.Aiming at the shortcomings of poor photocatalytic performance of pure ZnO@PAN nanofiber membrane,ZnO@PAN nanofiber membrane was modified from the ZnO nanowire diameter optimization and Sm element doping.Under the same conditions the degradation performance can reach 96.4%for Rhodamine B solution,and the photocatalytic performance of the nanofiber membrane is still above 90%after 5 cycles of experiments.The photocatalytic effect of ZnO nanofiber membranes was investigated under different acid and alkali and initial concentrations.When the rhodamine B solution was alkaline and the concentration was low,the photocatalytic performance of ZnO@PAN nanofiber membrane was the best.The research results of this paper have important reference value for the preparation of electrospun nanofiber composite membranes loaded with metal oxides and their application in the field of printing and dyeing wastewater treatment.