An uranyl sorption study inside functionalised nanopores.

ABSTRACT: 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 ⋅ 10⁶ 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 PB2MP-g-PVDF nanoporous membranes did not change the ion speciation. Two sorbed uranyl life-times (τ₁ = 8.8 μs and τ₂ = 102.8 μs) were measured by TRPL which pointed out different

SUBMITTER: Pinaeva U 

PROVIDER: S-EPMC7113287 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature