Complexation of uranyl ion by three polyacrylamide type polymers: Electrochemical preparation and leaching tests investigations

Abstract

We describe an original process for the treatment of low level activity radioactive liquid wastes. It deals with the electrochemical preparation of three polyacrylate polymers: polyacrylamide (PAam), polyacrylamidoglycolic acid (PAAG), polyacrylamidomethylpropanesulfonic acid (PAMPS) which are capable of complexing uranyl ions.We have demonstrated the complexation of uranyl by FT-IR and UV-Visible spectroscopy. All these complexes are soluble in water and we insolubilize in turn the complexes by crosslinking or by neutralization of positively charged complexes by the addition of polyanions to the medium. We have then done dynamic and static leaching tests on these insoluble complexes.

Complexation of uranyl ions by polypyrrole doped by sulfonated and phosphonated polyethyleneimine

“…A mixture of UO 3 and U 3 O 8 was systematically observed, and the uranium content was calculated from the weight of the collected uranium oxides (Table II). Although the amount of uranium complexed by PEI and derivatives is significant, it is less important compared to complexation by PVI, PAMPS, and PAGA 12, 13. Complexation of uranium by PEI and PEIPrSO 3 H is similar, which suggests that the sulfonate anions do not contribute extensively to the uranyl complexation.…”

“…Although the amount of uranium complexed by PEI and derivatives is significant, it is less important compared to complexation by PVI, PAMPS, and PAGA. 12,13 Complexation of uranium by PEI and PEIPrSO 3 H is similar, which suggests that the sulfonate anions do not contribute extensively to the uranyl complexation. The same conclusion was drawn elsewhere.…”

Determination of the stability constants of uranyl/polymer complexes by differential pulse polarography

“…In previous papers, we reported on the complexation of uranyl ions by various polymers [1][2] and polymer composites [3] with the purpose to use these polymers for the treatment of low level activity liquid wastes in aqueous nitric solutions. Nevertheless, all the polymer/UO 2 2+ complexes studied were soluble in water, unless crosslinked.…”

“…The first one consisted of the addition of a polyanion, i.e. polystyrenesulfonate (PSSO 3 − ) or polystyrenecarboxylate (PSCOO − ) [1][2] to the complex which precipitated as a neutral complex. In a second method, UO 2 2+ complexes with a polyanion, such as polyacrylamidoglycolic acid (PAGA) or polyacrylamidomethylpropanesulfonic acid (PAMPS), were used as doping agents in insoluble polycationic polypyrrole [3].…”

New system for complexation of uranyl ions from liquid wastes of low-level activity: Polypyrrole doped with complexing polyanions

“…In another study9 we also demonstrated that the UO ions could be complexed by polyacrylamide derivatives [poly(2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid) (PAMPS) and poly(2‐acrylamidoglycolic acid) (PAAG), Scheme ) electrochemically prepared in water 9. The water soluble complex of uranium/polyacrylamide was precipitated in water by either crosslinking of the water soluble polyacrylamide‐type polymers by N,N ′‐methylene‐bis‐acrylamide or the addition of polyanions (polystyrenesulfonate or polystyrenecarboxylate).…”