Leaching Peculiarity of Uranium-Containing Layered Double Hydroxide Sediment Varied with Environmental Anions.

In this research, we focus our attention on the leaching peculiarity of uranium-containing Mg-Al layered double hydroxide (LDH) which is one kind of waste sediment in uranium tailings, generated by the alkalinization of uranyl raffinate. The effect of inorganic (CO, SO, PO) and organic (CO, CHO, CHOP) anions were investigated. Atomic force microscopy result showed that the thickness of CO-LDH increased to 8.

Chelating Effect of Siderophore Desferrioxamine-B on Uranyl Biomineralization Mediated by .

In contaminated water and soil, little is known about the role and mechanism of the biometabolic molecule siderophore desferrioxamine-B (DFO) in the biogeochemical cycle of uranium due to complicated coordination and reaction networks. Here, a joint experimental and quantum chemical investigation is carried out to probe the biomineralization of uranyl (UO, referred to as U(VI) hereafter) induced by (abbreviated as ) in the presence of DFO and Fe ion. The results show that the production of mineralized solids {hydrogen-uranium mica [H(UO)(PO)·8HO]} via binding with UO is inhibited by DFO, which can both chelate preferentially UO to form a U(VI)-DFO complex in solution and seize it from U(VI)-biominerals upon solvation.