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Monitoring Protein Adsorption with Solid-state Nanopores
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An uranyl sorption study inside functionalised nanopores.

U Pinaeva1, N Ollier1, O Cavani1

  • 1Laboratoire des Solides Irradiés CEA-CNRS-Ecole Polytechnique UMR7642, Institut Polytechnique de Paris, 91128, Palaiseau Cedex, France.

Scientific Reports
|April 3, 2020
PubMed
Summary
This summary is machine-generated.

Poly(bis[2-(methacryloyloxy)ethyl] phosphate) (PB2MP) functionalised polyvinylidene fluoride (PVDF) membranes effectively sorb uranyl ions, exhibiting optimal performance at neutral pH. Time-resolved photoluminescence (TRPL) proved useful for uranyl monitoring.

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Area of Science:

  • Materials Science
  • Environmental Science
  • Analytical Chemistry

Background:

  • Polyvinylidene fluoride (PVDF) track-etched membranes functionalized with poly(bis[2-(methacryloyloxy)ethyl] phosphate) (PB2MP) offer potential for selective ion sorption.
  • Understanding the sorption mechanism of uranyl (U(VI)) is crucial for environmental remediation and nuclear waste management.

Purpose of the Study:

  • To investigate the sorption mechanism of uranyl by PB2MP-g-PVDF membranes.
  • To characterize the sorbed uranyl species and evaluate the performance of the membranes for uranyl removal and monitoring.

Main Methods:

  • Sorption experiments were conducted to determine the isotherm model and uptake capacity.
  • X-ray Photoelectron Spectroscopy (XPS) was used to identify the oxidation state and chemical environment of sorbed uranyl.
  • Time-Resolved Photoluminescence (TRPL) spectroscopy was employed to study uranyl complexation and its potential for detection.

Main Results:

  • Uranyl sorption followed the Langmuir isotherm model with a maximum uptake of 6.73 μmol g⁻¹ and an affinity constant of 9.85 × 10⁶ L mol⁻¹.
  • XPS confirmed that uranyl remained in its hexavalent state (U(VI)) after sorption.
  • TRPL measurements revealed two distinct uranyl lifetimes, indicating different complexation environments, and demonstrated pH-dependent sorption with peak performance at circumneutral pH.

Conclusions:

  • PB2MP-g-PVDF membranes exhibit excellent uranyl sorption capabilities, governed by the Langmuir model.
  • TRPL spectroscopy is a valuable tool for characterizing sorbed uranyl and shows promise for on-site trace monitoring, offering an alternative to traditional methods like voltammetry.