Characterizing solution and solid-phase amorphous uranyl silicates

U(VI) sorption on montmorillonite in the absence and presence of carbonate: A macroscopic and microscopic study

“…EA2. This short distance of $3.09 Å lies within the values ranging from 3.08 to 3.16 Å reported for U(VI) sorbed on silica and albite, in boldwoodite, soddyite or in amorphous uranyl silicates, corresponding to a bidentate coordination of U(VI) to one Si atom (Demartin et al, 1992;Reich et al, 1996;Sylwester et al, 2000;Burns, 2005;Walter et al, 2005;Soderholm et al, 2008). The sorption of U(VI) on kaolinite (Krepelova et al, 2008) is the only study on a clay mineral for which this short U-Si/Al distance was reported.…”

Exploring Actinide Materials Through Synchrotron Radiation Techniques

“…Moreover, the structure of UO 2 2+ ‐SO 4 2− ion pair in solution was found to be similar with the solid crystalline structures of uranyl sulfate hydrate . Uranyl‐silicate solutions and precipitates under various pHs with different preparing routes were characterized by HEXS, as well as the XRD analysis technique . Obvious oligomerization of uranyl ions was found under various pH values except for that below 3.…”

Synthesis and Characterization of 1‐, 2‐, and 3‐Dimensional Bimetallic UO22+/Zn2+ Phosphonoacetates

“…These structures are 1-and 2-dimensional, respectively, and contain fully hydrated [Zn(H 2 O) 6 organic matter and additionally interactions with microorganisms. [32,33] With respect to the latter, the interactions of biological species with uranium are influenced by the functionality of cellular components that include hydroxy, amino, phosphoryl, and carboxyl groups. [29,34] Carboxyphosphonate compounds contain functionalites analogous to those found in bacteria and other microorganisms, namely both phosphonate (-PO 3 ) and carboxylate (-CO 2 ) groups, and thus provide a suitable model for understanding the complexation behavior of actinides in bio-systems.…”