Preparation Of UO₃3/C₃N₄ Compositematerial And Its Photocatalytic Degradation Of Polyvinyl Alcohol And Rhodamine B

With the development of industry,the problem of water pollution has become more and more serious,and exploring efficient water treatment technology has become the key to solve such problems.In recent years,photocatalytic technologyfor water treatment has received extensive attention for its advantages of cleanliness,high efficiency,and simple operation.In addition,the use of depleted uranium produced in the nuclear industry has attracted attention from all over the world.In this study,a new type of UO_3/C₃N₄nanocomposite was prepared by in-situ calcination method.XRD,XPS,SEM,TEM,UV-vis DRS and other techniques were adopted to characterize the prepared samples.The results show that the UO₃/C₃N₄composite has been successfully prepared and its visible light absorption capacity has been improved compared to pristine C₃N₄.The performance of photocatalytic degradation of rhodamine B（RhB）and polyvinyl alcohol（PVA）over UO₃/C₃N₄composite materials with different composite ratios was explored.Results show that UCN-10（The composite mass ratio of UO₃and C₃N₄is10wt%）has the best photocatalytic activity:the photocatalytic degradation rate constant of PVA over UCN-10 isincreased by a factor of 17.1 and17.4,compared to pure C₃N₄and UO₃,respectively;the photocatalytic degradation rate constantof RhBover UCN-10 enhanced by 8 and 22times,respectively.In addition,the influences of conditions such as the amount of catalyst,p H value and initial concentration of the solution on the photocatalytic degradation of PVA and RhB were investigated.Results showed that the UO₃/C₃N₄composite gives higher activity for photocatalytic degradation of PVA and RhB with a lower p H value,a higher amount of catalyst and a lower initial concentration.At last but not at least,the main active species in the photocatalytic process of UO₃/C₃N₄are explored by adopting suitable trapping agents,and the results show that·O₂^-and h⁺are the main active species in the degradation of PVA and RhB.