The chemistry of uranium. Part 31. The kinetics of the Reaction between Ce(IV) and U(IV) in acetone.

Cobalt doped titania-carbon nanosheets with induced oxygen vacancies for photocatalytic degradation of uranium complexes in radioactive wastes

“…1d). The peak at a lower wavelength is associated with the 6 A 1g (S) to 4 A 1g (G), 4 E g (G), and A 1g (S) to 4 T 2g (G) transitions, whereas the peak at 582 nm is for the Co 2+ in octahedral coordination 6 A 1g (S) to 4 T 1g (G). Each Ti 4+ in TiO 2 is coordinated with six oxygen atoms.…”

“…3 Uranium forms complexes in waste solutions with existing chelating agents such as tributyl phosphate, Alizarin red S, ethylenediaminetetraacetic acid (EDTA), xylenol orange, arsenazo III, and chlorophosphonazo. [4][5][6] Such complexes are absorbed into the human body until they reach the liver and kidneys. Several methods have been used or suggested to remove uranium and other heavy metal ions from a nuclear waste solution, such as chemical precipitation, adsorption, membrane ltration, and ion exchange.…”

“…These organic species inuence the photocatalytic reduction of U(VI) by two mechanisms; (a) the adsorption of U(VI) on solid surfaces is altered by the competing diverse organics, 50,51 and (b) U(VI) forms complex ions with a lot of this organic matter, which completely changes the nature of the uranium ions in the solutions. [4][5][6] The present study introduces a nanostructured TiO 2 -based photocatalyst (Co@TiO 2 -C) to efficiently remove uranium complexes from contaminated water. Co@TiO 2 -C promotes two photocatalytic processes: decomposing the complexes, such as U(VI)-ARZ3, and reducing U(VI) to insoluble U(IV).…”

“…These organic species influence the photocatalytic reduction of U( vi ) by two mechanisms; (a) the adsorption of U( vi ) on solid surfaces is altered by the competing diverse organics, 50,51 and (b) U( vi ) forms complex ions with a lot of this organic matter, which completely changes the nature of the uranium ions in the solutions. 4–6…”