Phosphate functionalized radiation grafted Teflon for capturing and quantifications of U(VI) and Pu(IV) ions at ultra-trace concentration in aqueous samples

Mhatre, Amol; Chappa, Sankararao; Chaudhari, C. V.; Bhardwaj, Y.K.; Pandey, Ashok K.

doi:10.1007/s10967-018-5950-x

Cited by 8 publications

(1 citation statement)

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“…7). The desorption of uranyl ions under acidic pH was previously reported 26 . It allows the release of the uranyl ion and to recycle the membrane for further U(VI) trapping and detection.…”

Section: Langmuirmentioning

confidence: 79%

An uranyl sorption study inside functionalised nanopores

Pinaeva¹,

Ollier²,

Cavani³

et al. 2020

Sci Rep

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Sorption mechanism of uranyl by poly(bis[2-(methacryloyloxy)ethyl] phosphate) (PB2MP) functionalised polyvinylidene fluoride (PVDF) track-etched membranes, PB2MP-g-PVDF, was investigated. It was found that uranyl sorption obeyed Langmuir isotherm model giving a maximum U(VI) membrane uptake of 6.73 μmol g −1 and an affinity constant of 9.85 10 6 L mol −1 . XpS and tRpL measurements were performed to identify sorbed uranyl oxidation state and its environment. Uranyl was found to be mainly in its hexavalent state, i.e. U(VI), showing that the trapping inside the PB2MPg-PVDF nanoporous membranes did not change the ion speciation. Two sorbed uranyl life-times (τ 1 = 8.8 μs and τ 2 = 102.8 μs) were measured by TRPL which pointed out different complexations taking place inside the nanopores. Uranyl sorption by PB2MP-g-PVDF membranes was also found to be pH dependent demonstrating the highest performance at circumneutral pH. In addition, TRPL was demonstrated to be not only a remarkable technique for U(VI) characterization, but also an alternative to voltammetry detection for trace on-site uranyl monitoring using PB2MP-g-PVDF nanoporous membranes.

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Section: Langmuirmentioning

confidence: 79%