Photoremoval Of Uranyl Ions And Their Role As Additives In Photocatalytic Degradation

In the face of fossil energy depletion today,nuclear energy as a clean energy occupies an increasingly important proportion.As an important strategic resource of nuclear energy,uranium processing and extraction are very important in both energy and environmental remediation.Especially with the development of nuclear industry,the post-treatment of uranium-containing wastewater is an important step related to people’s livelihood.How to selectively extract radioactive uranium from wastewater is an urgent problem to be solved.It was found that the reduction of uranyl doesn’t necessarily requires catalyst in a photocatalytic experiment.Based on this,the way of extracting uranium from the solution in the form of a solid by photochemical reduction was studied.In other words,the selective extraction of uranium can be achieved by adjusting the pH value and using the photochemical properties of uranium itself in the visible light range without catalyst.The effects of different factors,such as pH,alcohol concentration,initial uranyl concentration,and real sea water on selective extraction of uranium were studied.The UV-Vis absorption spectra and photoluminescence spectra show that the absorption of uranyl solution in the visible region is the energy source of uranyl self-reduction And we verify the species that play the visible light response in this process through theoretical calculation,and the mechanism of uranium reduction and the process of uranium reduction were reasonably guessed and verified.At the same time,the solids produced by reduction were characterized and studied At the same time,we have studied the role of uranyl ions as ionic additives in photocatalytic degradation of dyes,using redox electron pairs formed by pentavalent uranyl and hexavalent uranyl.The effects of pH,dye concentration,dye type and uranyl concentration on the photocatalytic degradation of CdS were studied.The photocatalytic mechanism was studied.