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

Leroy, D.; Martinot, L.; Debecker, M.; Strivay, David; Weber, G.; Jérôme, Christine; Jérôme, Robert

doi:10.1002/1097-4628(20000808)77:6<1230::aid-app7>3.0.co;2-z

Cited by 10 publications

(6 citation statements)

References 19 publications

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“…Rovibrational energy levels were calculated for each potential energy curve using LEVEL; from these, spectroscopic constants were obtained. R e and D e were obtained from the minimum of the interpolated potential.…”

Section: Computational Detailsmentioning

confidence: 99%

Interactions in the B⁺–RG Complexes and Comparison with Be⁺–RG (RG = He–Rn): Evidence for Chemical Bonding

et al. 2012

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Potential energy curves for the interaction of B(+) ((1)S) with RG ((1)S), RG = He-Rn, have been calculated at the CCSD(T) level of theory employing quadruple-ζ and quintuple-ζ quality basis sets. The interaction energies from these curves were subsequently point-by-point extrapolated to the basis set limit. Rovibrational energy levels have been calculated for each extrapolated curve, from which spectroscopic parameters are determined. These are compared to previously determined experimental and theoretical values. The potentials have also been employed to calculate the transport coefficients for B(+) traveling through a bath of RG atoms. We also investigate the interactions between B(+) and the rare gases via contour plots, natural population analysis (NPA), and molecular orbital diagrams. In addition, we consider the atoms-in-molecules (AIM) parameters. The interactions here are compared and contrasted with those for Li(+)-He and Be(+)-RG; it is concluded that there is significant and increasing dative covalent bonding for the Be(+)-RG and B(+)-RG complexes for RG = Ar-Rn, while the other species are predominantly physically bound.

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Section: Computational Detailsmentioning

confidence: 99%

Interactions in the B⁺–RG Complexes and Comparison with Be⁺–RG (RG = He–Rn): Evidence for Chemical Bonding

et al. 2012

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“…In this way, we cannot decrease extensively the hydrolysis ratio H as defined in eqn (1), since a minimum water volume of 10 ml is required to solubilize the silylated copolymers before adding the TEOS. H~½ H2O ½TEOSz 3 4 ½Silylatedmonomerincopolymer…”

Section: Preparation Of Copolymer-silica Gels (Approach I)mentioning

confidence: 99%

“…2 The insolubilisation of the complexes is achieved either by addition of a polyanion such as polystyrenesulfonate (PSSO 3 2 Na z ) or by doping a conducting polymer (PPy), which is insoluble in water, with the two quoted polymers. 3 The potential of the final compound to fix uranium is ascertained by leaching tests (static or dynamic).…”

Section: Introductionmentioning

confidence: 99%

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New silica based polymeric systems designed for the solid–liquid extraction of uranyl ions

et al. 2001

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3-(Triethoxysilyl)propylacrylamide monomer was synthesized for the first time and then copolymerized with acrylamide (Aam), allyltriethoxysilane (TEA) or 3-(triethoxysilyl)propylacrylate (TMPAac). These three silylated copolymers were investigated as uranyl complexing agents. In another experiment, the copolymers were processed with tetraethylorthosilicate (TEOS) following a sol-gel process to prepare new microporous gels suited for solid-liquid uranium extraction from liquid wastes. The gels were prepared with uranyl as imprinted gels and without uranyl ions in solution to obtain non-imprinted gels. The effect on the uranyl binding capacities of the gels was studied. The imprinted gels were also dipped in ternary solutions of thorium, lanthanum and uranium. Selectivity toward uranyl was observed for uranyl imprinted gels. The stability of the different matrices against dynamic leaching and gamma irradiation was also studied.

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“…Semipermeable membranes embodying nanoparticles are widely prepared and used for electrode surface modification because of great potential applications in catalysis and interface-electrochemistry [38]. A number of reports are available where electrochemistry of UO 2 2+ ions was investigated on ligand or polymer modified electrodes [39][40][41][42][43][44][45]. Bismuth-film electrode was also used for uranium determination [46].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical studies of U(VI)/U(V) in saturated Na₂CO₃solution at gold nanoparticles embedded CTA-modified electrode

Sharma

Ambolikar

2011

Radiochimica Acta

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Gold nanoparticles / Uranyl / Voltammetry / Impedance spectroscopy / ElectrocatalysisSummary. Gold nanoparticles (AuNPs) were prepared in the matrix of cellulose triacetate (CTA) membrane containing a liquid anion exchanger trioctylmethylammonium chloride (Aliquat-336). The AuCl 4 − ions were transferred in the membrane matrix by anion-exchange process, and then subsequently reduced with NaBH 4 to form AuNPs in the membrane. The AuNPs-embedded CTA (AuNPs-CTA) membrane was characterized by UV-visible spectroscopy, XRD and AFM. The electrochemical properties of AuNPs-CTA modified electrode were evaluated by studying redox behavior of UO 2 2+ /UO 2 + couple in saturated Na 2 CO 3 solution, using voltammetric techniques. In carbonate solution, the predominant species of UO 2 2+ is [UO 2 (CO 3 ) 3 ] 4− , and a stable UO 2 (CO 3 ) 3 5− complex is formed by one-electron reduction of UO 2 (CO 3 ) 3 4− . Previous reports show that the UO 2 2+ /UO 2 + couple, which is electrochemically reversible in less complexing media, becomes electrochemically irreversible in aqueous CO 3 2− solution. In this study, an electrocatalytic reduction of UO 2 2+ to UO 2 + in saturated Na 2 CO 3 solution was observed at AuNPs-CTA-modified electrode with higher current density and faster heterogeneous electron-transfer kinetics than that at bare Au electrode. The standard heterogeneous rate constant, k • , for the reduction process at AuNPs-CTA modified electrode was about 25 times higher than that of bare Au electrode. Therefore, it is concluded that AuNPs-CTA membrane has improved the interfacial electron-transfer properties of electrode, resulting in a better electrochemical response than bare Au electrode.

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

Cited by 10 publications

References 19 publications

Interactions in the B⁺–RG Complexes and Comparison with Be⁺–RG (RG = He–Rn): Evidence for Chemical Bonding

Interactions in the B⁺–RG Complexes and Comparison with Be⁺–RG (RG = He–Rn): Evidence for Chemical Bonding

New silica based polymeric systems designed for the solid–liquid extraction of uranyl ions

Electrochemical studies of U(VI)/U(V) in saturated Na₂CO₃solution at gold nanoparticles embedded CTA-modified electrode

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

Cited by 10 publications

References 19 publications

Interactions in the B+–RG Complexes and Comparison with Be+–RG (RG = He–Rn): Evidence for Chemical Bonding

Interactions in the B+–RG Complexes and Comparison with Be+–RG (RG = He–Rn): Evidence for Chemical Bonding

New silica based polymeric systems designed for the solid–liquid extraction of uranyl ions

Electrochemical studies of U(VI)/U(V) in saturated Na2CO3solution at gold nanoparticles embedded CTA-modified electrode

Contact Info

Product

Resources

About

Interactions in the B⁺–RG Complexes and Comparison with Be⁺–RG (RG = He–Rn): Evidence for Chemical Bonding

Interactions in the B⁺–RG Complexes and Comparison with Be⁺–RG (RG = He–Rn): Evidence for Chemical Bonding

Electrochemical studies of U(VI)/U(V) in saturated Na₂CO₃solution at gold nanoparticles embedded CTA-modified electrode